./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety/960521-1-2.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_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/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_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety/960521-1-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/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_5f28f792-ae6b-455a-a8c7-12f6329b4eea/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 19e2947f690bcfa099d607c2a0a6dc0e6f351f54e3f3874a42109cbf9e336957 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 22:50:52,782 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 22:50:52,784 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 22:50:52,832 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 22:50:52,833 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 22:50:52,835 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 22:50:52,836 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 22:50:52,839 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 22:50:52,841 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 22:50:52,842 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 22:50:52,843 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 22:50:52,845 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 22:50:52,846 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 22:50:52,847 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 22:50:52,849 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 22:50:52,851 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 22:50:52,852 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 22:50:52,853 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 22:50:52,856 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 22:50:52,859 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 22:50:52,861 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 22:50:52,868 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 22:50:52,869 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 22:50:52,870 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 22:50:52,874 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 22:50:52,874 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 22:50:52,875 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 22:50:52,876 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 22:50:52,876 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 22:50:52,878 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 22:50:52,878 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 22:50:52,879 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 22:50:52,880 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 22:50:52,881 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 22:50:52,885 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 22:50:52,887 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 22:50:52,888 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 22:50:52,888 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 22:50:52,888 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 22:50:52,889 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 22:50:52,890 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 22:50:52,891 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-20 22:50:52,938 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 22:50:52,938 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 22:50:52,938 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 22:50:52,939 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 22:50:52,939 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 22:50:52,939 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 22:50:52,940 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 22:50:52,940 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 22:50:52,940 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 22:50:52,940 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 22:50:52,940 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 22:50:52,941 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 22:50:52,941 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 22:50:52,941 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 22:50:52,941 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 22:50:52,942 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 22:50:52,942 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 22:50:52,942 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 22:50:52,943 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-20 22:50:52,943 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-20 22:50:52,943 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 22:50:52,943 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 22:50:52,943 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-20 22:50:52,944 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 22:50:52,944 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 22:50:52,944 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 22:50:52,944 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-20 22:50:52,944 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-20 22:50:52,945 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-20 22:50:52,945 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 22:50:52,945 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-20 22:50:52,945 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 22:50:52,945 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 22:50:52,946 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 22:50:52,946 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 22:50:52,946 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:50:52,946 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 22:50:52,946 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 22:50:52,947 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 22:50:52,947 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 22:50:52,947 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 22:50:52,947 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 22:50:52,947 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_5f28f792-ae6b-455a-a8c7-12f6329b4eea/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 19e2947f690bcfa099d607c2a0a6dc0e6f351f54e3f3874a42109cbf9e336957 [2021-11-20 22:50:53,287 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 22:50:53,313 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 22:50:53,317 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 22:50:53,318 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 22:50:53,319 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 22:50:53,321 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/memsafety/960521-1-2.i [2021-11-20 22:50:53,389 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/data/589bb6588/faddfe12caf94d8bb064b3fbe629366b/FLAG1020070cf [2021-11-20 22:50:54,026 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 22:50:54,032 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/sv-benchmarks/c/memsafety/960521-1-2.i [2021-11-20 22:50:54,049 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/data/589bb6588/faddfe12caf94d8bb064b3fbe629366b/FLAG1020070cf [2021-11-20 22:50:54,396 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/data/589bb6588/faddfe12caf94d8bb064b3fbe629366b [2021-11-20 22:50:54,398 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 22:50:54,400 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 22:50:54,403 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 22:50:54,404 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 22:50:54,417 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 22:50:54,418 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,419 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6377bc54 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54, skipping insertion in model container [2021-11-20 22:50:54,420 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,427 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 22:50:54,472 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 22:50:54,771 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:50:54,782 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 22:50:54,832 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:50:54,865 INFO L208 MainTranslator]: Completed translation [2021-11-20 22:50:54,865 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54 WrapperNode [2021-11-20 22:50:54,865 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 22:50:54,867 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 22:50:54,867 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 22:50:54,867 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 22:50:54,875 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,911 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,932 INFO L137 Inliner]: procedures = 121, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2021-11-20 22:50:54,933 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 22:50:54,937 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 22:50:54,937 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 22:50:54,938 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 22:50:54,945 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,946 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,950 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,950 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,958 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,962 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,964 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,967 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 22:50:54,968 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 22:50:54,968 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 22:50:54,968 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 22:50:54,969 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (1/1) ... [2021-11-20 22:50:54,977 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:50:54,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:55,053 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 22:50:55,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 22:50:55,104 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 22:50:55,104 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 22:50:55,104 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-20 22:50:55,105 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 22:50:55,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 22:50:55,105 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 22:50:55,106 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 22:50:55,106 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 22:50:55,191 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 22:50:55,193 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 22:50:55,373 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 22:50:55,405 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 22:50:55,406 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 22:50:55,408 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:50:55 BoogieIcfgContainer [2021-11-20 22:50:55,409 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 22:50:55,411 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 22:50:55,411 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 22:50:55,429 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 22:50:55,429 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:50:54" (1/3) ... [2021-11-20 22:50:55,430 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d0c0452 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:50:55, skipping insertion in model container [2021-11-20 22:50:55,431 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:54" (2/3) ... [2021-11-20 22:50:55,431 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d0c0452 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:50:55, skipping insertion in model container [2021-11-20 22:50:55,431 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:50:55" (3/3) ... [2021-11-20 22:50:55,433 INFO L111 eAbstractionObserver]: Analyzing ICFG 960521-1-2.i [2021-11-20 22:50:55,438 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 22:50:55,438 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2021-11-20 22:50:55,514 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 22:50:55,538 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 [2021-11-20 22:50:55,550 INFO L340 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2021-11-20 22:50:55,577 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:55,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2021-11-20 22:50:55,585 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:55,586 INFO L514 BasicCegarLoop]: trace histogram [1, 1] [2021-11-20 22:50:55,586 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:50:55,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:55,593 INFO L85 PathProgramCache]: Analyzing trace with hash 3507, now seen corresponding path program 1 times [2021-11-20 22:50:55,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:55,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556631200] [2021-11-20 22:50:55,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:55,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:55,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:55,838 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:55,839 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:55,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556631200] [2021-11-20 22:50:55,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [556631200] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:55,841 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:55,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 22:50:55,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094473633] [2021-11-20 22:50:55,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:55,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:55,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:55,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:55,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:55,892 INFO L87 Difference]: Start difference. First operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:55,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:55,998 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2021-11-20 22:50:56,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:56,006 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2021-11-20 22:50:56,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:56,014 INFO L225 Difference]: With dead ends: 43 [2021-11-20 22:50:56,019 INFO L226 Difference]: Without dead ends: 42 [2021-11-20 22:50:56,021 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 [2021-11-20 22:50:56,026 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 1 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:56,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 61 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:50:56,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-20 22:50:56,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-11-20 22:50:56,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 22 states have (on average 2.0) internal successors, (44), 41 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:56,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2021-11-20 22:50:56,072 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 2 [2021-11-20 22:50:56,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:56,073 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2021-11-20 22:50:56,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:56,073 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2021-11-20 22:50:56,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2021-11-20 22:50:56,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:56,074 INFO L514 BasicCegarLoop]: trace histogram [1, 1] [2021-11-20 22:50:56,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 22:50:56,075 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:50:56,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:56,076 INFO L85 PathProgramCache]: Analyzing trace with hash 3508, now seen corresponding path program 1 times [2021-11-20 22:50:56,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:56,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187842219] [2021-11-20 22:50:56,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:56,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:56,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:56,134 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:56,135 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:56,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187842219] [2021-11-20 22:50:56,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187842219] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:56,136 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:56,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 22:50:56,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635809271] [2021-11-20 22:50:56,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:56,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:56,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:56,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:56,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:56,149 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:56,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:56,185 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-20 22:50:56,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:56,186 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2021-11-20 22:50:56,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:56,188 INFO L225 Difference]: With dead ends: 41 [2021-11-20 22:50:56,188 INFO L226 Difference]: Without dead ends: 41 [2021-11-20 22:50:56,189 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 [2021-11-20 22:50:56,200 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:56,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:50:56,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-20 22:50:56,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-20 22:50:56,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 40 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:56,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-11-20 22:50:56,215 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 2 [2021-11-20 22:50:56,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:56,216 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-11-20 22:50:56,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:56,216 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-11-20 22:50:56,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-20 22:50:56,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:56,222 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-20 22:50:56,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 22:50:56,222 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:50:56,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:56,224 INFO L85 PathProgramCache]: Analyzing trace with hash 3443713, now seen corresponding path program 1 times [2021-11-20 22:50:56,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:56,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106364083] [2021-11-20 22:50:56,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:56,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:56,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:56,326 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:56,327 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:56,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106364083] [2021-11-20 22:50:56,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106364083] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:56,328 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:56,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:50:56,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407715532] [2021-11-20 22:50:56,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:56,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:50:56,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:56,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:50:56,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:50:56,331 INFO L87 Difference]: Start difference. First operand 41 states and 43 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) [2021-11-20 22:50:56,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:56,399 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-11-20 22:50:56,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:56,400 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 [2021-11-20 22:50:56,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:56,404 INFO L225 Difference]: With dead ends: 38 [2021-11-20 22:50:56,404 INFO L226 Difference]: Without dead ends: 38 [2021-11-20 22:50:56,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:50:56,407 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 44 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:56,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 33 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:50:56,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-20 22:50:56,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-11-20 22:50:56,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 37 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:56,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-11-20 22:50:56,418 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 4 [2021-11-20 22:50:56,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:56,419 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-11-20 22:50:56,419 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) [2021-11-20 22:50:56,419 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-11-20 22:50:56,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-20 22:50:56,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:56,420 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-20 22:50:56,420 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 22:50:56,421 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:50:56,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:56,423 INFO L85 PathProgramCache]: Analyzing trace with hash 3443714, now seen corresponding path program 1 times [2021-11-20 22:50:56,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:56,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131284651] [2021-11-20 22:50:56,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:56,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:56,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:56,579 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:56,580 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:56,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131284651] [2021-11-20 22:50:56,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131284651] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:56,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:56,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:50:56,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634323548] [2021-11-20 22:50:56,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:56,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 22:50:56,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:56,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 22:50:56,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:56,585 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:56,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:56,674 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-11-20 22:50:56,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 22:50:56,675 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-20 22:50:56,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:56,677 INFO L225 Difference]: With dead ends: 42 [2021-11-20 22:50:56,677 INFO L226 Difference]: Without dead ends: 42 [2021-11-20 22:50:56,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:56,685 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 40 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:56,687 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 54 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:50:56,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-20 22:50:56,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 39. [2021-11-20 22:50:56,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 25 states have (on average 1.64) internal successors, (41), 38 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:56,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2021-11-20 22:50:56,698 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 4 [2021-11-20 22:50:56,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:56,698 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2021-11-20 22:50:56,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:56,699 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2021-11-20 22:50:56,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 22:50:56,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:56,699 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2021-11-20 22:50:56,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 22:50:56,700 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:50:56,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:56,702 INFO L85 PathProgramCache]: Analyzing trace with hash -985496187, now seen corresponding path program 1 times [2021-11-20 22:50:56,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:56,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193449756] [2021-11-20 22:50:56,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:56,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:56,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:56,872 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:56,872 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:56,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193449756] [2021-11-20 22:50:56,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193449756] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:56,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068786297] [2021-11-20 22:50:56,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:56,873 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:56,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:56,879 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:56,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 22:50:56,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:56,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 22:50:56,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:57,075 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-20 22:50:57,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2021-11-20 22:50:57,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:57,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:57,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:57,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068786297] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:57,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [788283782] [2021-11-20 22:50:57,403 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-20 22:50:57,405 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:57,410 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:50:57,415 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:50:57,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:50:57,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:57,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:57,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:57,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:57,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:57,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-20 22:50:57,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:57,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-20 22:50:57,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:57,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:57,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:57,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 45 [2021-11-20 22:50:58,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:58,448 INFO L354 Elim1Store]: treesize reduction 189, result has 11.3 percent of original size [2021-11-20 22:50:58,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 276 treesize of output 270 [2021-11-20 22:50:58,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 22:50:58,862 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:50:59,035 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:50:59,035 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:50:59,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 10 [2021-11-20 22:50:59,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520781985] [2021-11-20 22:50:59,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:59,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 22:50:59,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:59,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 22:50:59,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-20 22:50:59,038 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 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) [2021-11-20 22:50:59,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:59,290 INFO L93 Difference]: Finished difference Result 80 states and 83 transitions. [2021-11-20 22:50:59,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 22:50:59,291 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-20 22:50:59,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:59,292 INFO L225 Difference]: With dead ends: 80 [2021-11-20 22:50:59,292 INFO L226 Difference]: Without dead ends: 80 [2021-11-20 22:50:59,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2021-11-20 22:50:59,294 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 246 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:59,294 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 126 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 22:50:59,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-20 22:50:59,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 47. [2021-11-20 22:50:59,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 46 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:59,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2021-11-20 22:50:59,301 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 6 [2021-11-20 22:50:59,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:59,301 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2021-11-20 22:50:59,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 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) [2021-11-20 22:50:59,302 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2021-11-20 22:50:59,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 22:50:59,303 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:59,303 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2021-11-20 22:50:59,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:59,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:59,515 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:50:59,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:59,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1172884082, now seen corresponding path program 2 times [2021-11-20 22:50:59,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:59,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945355336] [2021-11-20 22:50:59,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:59,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:59,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:59,724 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:59,725 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:59,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945355336] [2021-11-20 22:50:59,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [945355336] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:59,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102313897] [2021-11-20 22:50:59,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:50:59,726 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:59,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:59,727 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:59,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 22:50:59,779 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 22:50:59,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:59,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 22:50:59,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:59,801 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-20 22:50:59,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-11-20 22:50:59,950 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 22:50:59,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:00,252 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 22:51:00,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102313897] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:00,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [546288905] [2021-11-20 22:51:00,254 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-20 22:51:00,255 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:51:00,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:51:00,255 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:51:00,256 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:51:00,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:00,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:00,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:00,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:00,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:00,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-20 22:51:00,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:00,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-20 22:51:00,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:00,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:00,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:00,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 45 [2021-11-20 22:51:01,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:01,138 INFO L354 Elim1Store]: treesize reduction 189, result has 11.3 percent of original size [2021-11-20 22:51:01,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 276 treesize of output 270 [2021-11-20 22:51:01,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 22:51:01,541 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:51:01,709 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:51:01,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:51:01,710 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 3, 3] total 13 [2021-11-20 22:51:01,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680888690] [2021-11-20 22:51:01,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:01,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-20 22:51:01,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:01,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-20 22:51:01,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=256, Unknown=0, NotChecked=0, Total=342 [2021-11-20 22:51:01,712 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand has 15 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:02,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:02,144 INFO L93 Difference]: Finished difference Result 175 states and 181 transitions. [2021-11-20 22:51:02,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 22:51:02,145 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 22:51:02,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:02,146 INFO L225 Difference]: With dead ends: 175 [2021-11-20 22:51:02,147 INFO L226 Difference]: Without dead ends: 175 [2021-11-20 22:51:02,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-11-20 22:51:02,148 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 488 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 488 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:02,148 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [488 Valid, 183 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 22:51:02,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-11-20 22:51:02,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 49. [2021-11-20 22:51:02,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 36 states have (on average 1.4722222222222223) internal successors, (53), 48 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:02,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-11-20 22:51:02,166 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 12 [2021-11-20 22:51:02,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:02,167 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-11-20 22:51:02,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:02,167 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-11-20 22:51:02,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-20 22:51:02,168 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:02,168 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1] [2021-11-20 22:51:02,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 22:51:02,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 22:51:02,383 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:51:02,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:02,383 INFO L85 PathProgramCache]: Analyzing trace with hash -845963128, now seen corresponding path program 1 times [2021-11-20 22:51:02,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:02,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723274401] [2021-11-20 22:51:02,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:02,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:02,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:02,429 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-20 22:51:02,429 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:02,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723274401] [2021-11-20 22:51:02,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723274401] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:51:02,430 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:51:02,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:51:02,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633340588] [2021-11-20 22:51:02,430 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:51:02,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:51:02,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:02,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:51:02,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:51:02,432 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 4 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) [2021-11-20 22:51:02,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:02,470 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2021-11-20 22:51:02,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 22:51:02,471 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-20 22:51:02,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:02,471 INFO L225 Difference]: With dead ends: 47 [2021-11-20 22:51:02,471 INFO L226 Difference]: Without dead ends: 47 [2021-11-20 22:51:02,472 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 [2021-11-20 22:51:02,473 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 13 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:02,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 44 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:51:02,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-20 22:51:02,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-20 22:51:02,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 36 states have (on average 1.3888888888888888) internal successors, (50), 46 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:02,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2021-11-20 22:51:02,481 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 17 [2021-11-20 22:51:02,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:02,481 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2021-11-20 22:51:02,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:02,482 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2021-11-20 22:51:02,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-20 22:51:02,483 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:02,483 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1] [2021-11-20 22:51:02,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 22:51:02,483 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:51:02,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:02,484 INFO L85 PathProgramCache]: Analyzing trace with hash -845963127, now seen corresponding path program 1 times [2021-11-20 22:51:02,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:02,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454544944] [2021-11-20 22:51:02,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:02,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:02,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:02,594 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:02,594 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:02,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454544944] [2021-11-20 22:51:02,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454544944] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:02,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1486090545] [2021-11-20 22:51:02,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:02,595 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:02,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:02,597 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:02,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 22:51:02,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:02,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 22:51:02,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:02,841 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:02,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:02,992 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:02,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1486090545] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:02,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [627782481] [2021-11-20 22:51:02,995 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 22:51:02,995 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:51:02,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:51:02,995 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:51:02,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:51:03,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:03,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:03,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:03,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:03,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:03,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-20 22:51:03,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:03,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-20 22:51:03,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:03,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:03,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:03,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 38 [2021-11-20 22:51:03,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:03,815 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 22:51:03,851 INFO L354 Elim1Store]: treesize reduction 112, result has 20.0 percent of original size [2021-11-20 22:51:03,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 237 treesize of output 239 [2021-11-20 22:51:04,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 22:51:04,353 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:51:04,535 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:51:04,535 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:51:04,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 24 [2021-11-20 22:51:04,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148558667] [2021-11-20 22:51:04,535 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:04,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 22:51:04,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:04,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 22:51:04,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=542, Unknown=0, NotChecked=0, Total=870 [2021-11-20 22:51:04,538 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 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) [2021-11-20 22:51:04,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:04,854 INFO L93 Difference]: Finished difference Result 253 states and 261 transitions. [2021-11-20 22:51:04,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 22:51:04,855 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 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 17 [2021-11-20 22:51:04,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:04,857 INFO L225 Difference]: With dead ends: 253 [2021-11-20 22:51:04,857 INFO L226 Difference]: Without dead ends: 253 [2021-11-20 22:51:04,858 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=476, Invalid=856, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 22:51:04,859 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 643 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 643 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:04,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [643 Valid, 260 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 22:51:04,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-11-20 22:51:04,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 73. [2021-11-20 22:51:04,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 62 states have (on average 1.3064516129032258) internal successors, (81), 72 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) [2021-11-20 22:51:04,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 81 transitions. [2021-11-20 22:51:04,867 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 81 transitions. Word has length 17 [2021-11-20 22:51:04,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:04,867 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 81 transitions. [2021-11-20 22:51:04,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 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) [2021-11-20 22:51:04,868 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 81 transitions. [2021-11-20 22:51:04,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-20 22:51:04,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:04,869 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1] [2021-11-20 22:51:04,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 22:51:05,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-20 22:51:05,083 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:51:05,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:05,083 INFO L85 PathProgramCache]: Analyzing trace with hash 587784305, now seen corresponding path program 2 times [2021-11-20 22:51:05,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:05,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [960408141] [2021-11-20 22:51:05,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:05,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:05,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:05,306 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:05,307 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:05,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [960408141] [2021-11-20 22:51:05,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [960408141] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:05,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854580641] [2021-11-20 22:51:05,307 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:51:05,307 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:05,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:05,308 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:05,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 22:51:05,353 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-20 22:51:05,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:51:05,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-20 22:51:05,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:05,378 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-20 22:51:05,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2021-11-20 22:51:05,801 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-20 22:51:05,801 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:51:05,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854580641] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:51:05,802 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:51:05,802 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [17] total 19 [2021-11-20 22:51:05,802 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970490936] [2021-11-20 22:51:05,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:51:05,802 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:51:05,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:05,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:51:05,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=236, Unknown=0, NotChecked=0, Total=380 [2021-11-20 22:51:05,804 INFO L87 Difference]: Start difference. First operand 73 states and 81 transitions. Second operand has 4 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) [2021-11-20 22:51:05,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:05,840 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2021-11-20 22:51:05,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 22:51:05,841 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-20 22:51:05,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:05,844 INFO L225 Difference]: With dead ends: 67 [2021-11-20 22:51:05,845 INFO L226 Difference]: Without dead ends: 67 [2021-11-20 22:51:05,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=144, Invalid=236, Unknown=0, NotChecked=0, Total=380 [2021-11-20 22:51:05,848 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:05,848 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 24 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:51:05,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-20 22:51:05,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-11-20 22:51:05,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 60 states have (on average 1.2166666666666666) internal successors, (73), 66 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:05,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 73 transitions. [2021-11-20 22:51:05,866 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 73 transitions. Word has length 33 [2021-11-20 22:51:05,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:05,867 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 73 transitions. [2021-11-20 22:51:05,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:05,867 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 73 transitions. [2021-11-20 22:51:05,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-20 22:51:05,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:05,868 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 2, 1, 1, 1, 1, 1] [2021-11-20 22:51:05,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 22:51:06,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:06,069 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:51:06,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:06,069 INFO L85 PathProgramCache]: Analyzing trace with hash -2074921727, now seen corresponding path program 1 times [2021-11-20 22:51:06,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:06,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411321981] [2021-11-20 22:51:06,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:06,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:06,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:06,292 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 22:51:06,293 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:06,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411321981] [2021-11-20 22:51:06,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411321981] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:06,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [23597940] [2021-11-20 22:51:06,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:06,294 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:06,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:06,295 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:06,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 22:51:06,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:06,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-20 22:51:06,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:06,728 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 22:51:06,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:07,163 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 22:51:07,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [23597940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:07,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [935989633] [2021-11-20 22:51:07,166 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 22:51:07,166 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:51:07,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:51:07,166 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:51:07,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:51:07,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:07,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:07,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:07,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:07,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:07,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-20 22:51:07,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:07,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-20 22:51:07,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:07,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:07,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:07,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 40 [2021-11-20 22:51:07,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:07,885 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 22:51:07,885 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 22:51:07,932 INFO L354 Elim1Store]: treesize reduction 118, result has 20.3 percent of original size [2021-11-20 22:51:07,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 247 treesize of output 247 [2021-11-20 22:51:08,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 22:51:08,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 22:51:08,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:08,506 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 46 treesize of output 45 [2021-11-20 22:51:08,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 22:51:08,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 22:51:08,828 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:51:09,158 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:51:09,159 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:51:09,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 48 [2021-11-20 22:51:09,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001270051] [2021-11-20 22:51:09,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:09,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 22:51:09,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:09,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 22:51:09,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1051, Invalid=1811, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 22:51:09,163 INFO L87 Difference]: Start difference. First operand 67 states and 73 transitions. Second operand has 49 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 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) [2021-11-20 22:51:09,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:09,899 INFO L93 Difference]: Finished difference Result 450 states and 451 transitions. [2021-11-20 22:51:09,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-20 22:51:09,900 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 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 35 [2021-11-20 22:51:09,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:09,903 INFO L225 Difference]: With dead ends: 450 [2021-11-20 22:51:09,903 INFO L226 Difference]: Without dead ends: 450 [2021-11-20 22:51:09,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1940 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1577, Invalid=3115, Unknown=0, NotChecked=0, Total=4692 [2021-11-20 22:51:09,906 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 2180 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2180 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:09,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2180 Valid, 361 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 22:51:09,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2021-11-20 22:51:09,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 115. [2021-11-20 22:51:09,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 108 states have (on average 1.1944444444444444) internal successors, (129), 114 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) [2021-11-20 22:51:09,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 129 transitions. [2021-11-20 22:51:09,925 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 129 transitions. Word has length 35 [2021-11-20 22:51:09,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:09,926 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 129 transitions. [2021-11-20 22:51:09,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 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) [2021-11-20 22:51:09,928 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 129 transitions. [2021-11-20 22:51:09,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-20 22:51:09,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:09,933 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 2, 1, 1, 1, 1, 1] [2021-11-20 22:51:09,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 22:51:10,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:10,134 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:51:10,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:10,134 INFO L85 PathProgramCache]: Analyzing trace with hash -623734575, now seen corresponding path program 2 times [2021-11-20 22:51:10,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:10,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056264468] [2021-11-20 22:51:10,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:10,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:10,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:10,756 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 22:51:10,756 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:10,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056264468] [2021-11-20 22:51:10,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056264468] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:10,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493024849] [2021-11-20 22:51:10,757 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:51:10,757 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:10,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:10,758 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:10,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 22:51:10,798 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 22:51:10,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:51:10,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 22:51:10,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:10,816 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-20 22:51:10,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2021-11-20 22:51:11,560 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2021-11-20 22:51:11,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:51:11,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493024849] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:51:11,561 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:51:11,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [33] total 37 [2021-11-20 22:51:11,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994376610] [2021-11-20 22:51:11,561 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:51:11,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 22:51:11,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:11,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 22:51:11,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=545, Invalid=861, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 22:51:11,563 INFO L87 Difference]: Start difference. First operand 115 states and 129 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:11,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:11,601 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2021-11-20 22:51:11,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 22:51:11,602 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-20 22:51:11,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:11,603 INFO L225 Difference]: With dead ends: 114 [2021-11-20 22:51:11,603 INFO L226 Difference]: Without dead ends: 114 [2021-11-20 22:51:11,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=545, Invalid=861, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 22:51:11,604 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 44 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:11,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 24 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:51:11,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-20 22:51:11,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2021-11-20 22:51:11,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 108 states have (on average 1.0648148148148149) internal successors, (115), 113 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:11,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2021-11-20 22:51:11,608 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 67 [2021-11-20 22:51:11,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:11,609 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2021-11-20 22:51:11,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:11,609 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2021-11-20 22:51:11,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-20 22:51:11,611 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:11,611 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:51:11,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 22:51:11,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:11,811 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:51:11,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:11,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1881723269, now seen corresponding path program 1 times [2021-11-20 22:51:11,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:11,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270826278] [2021-11-20 22:51:11,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:11,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:11,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:11,924 INFO L134 CoverageAnalysis]: Checked inductivity of 1125 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1125 trivial. 0 not checked. [2021-11-20 22:51:11,924 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:11,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270826278] [2021-11-20 22:51:11,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270826278] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:51:11,924 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:51:11,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 22:51:11,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426542133] [2021-11-20 22:51:11,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:51:11,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:51:11,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:11,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:51:11,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:51:11,926 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:11,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:11,941 INFO L93 Difference]: Finished difference Result 112 states and 113 transitions. [2021-11-20 22:51:11,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:51:11,941 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-20 22:51:11,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:11,943 INFO L225 Difference]: With dead ends: 112 [2021-11-20 22:51:11,943 INFO L226 Difference]: Without dead ends: 112 [2021-11-20 22:51:11,943 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 [2021-11-20 22:51:11,944 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:11,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:51:11,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-20 22:51:11,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2021-11-20 22:51:11,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 108 states have (on average 1.0462962962962963) internal successors, (113), 111 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:11,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2021-11-20 22:51:11,952 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 98 [2021-11-20 22:51:11,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:11,953 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2021-11-20 22:51:11,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:11,953 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2021-11-20 22:51:11,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-20 22:51:11,955 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:11,955 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:51:11,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-20 22:51:11,955 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:51:11,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:11,962 INFO L85 PathProgramCache]: Analyzing trace with hash -168187089, now seen corresponding path program 1 times [2021-11-20 22:51:11,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:11,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643470179] [2021-11-20 22:51:11,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:11,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:12,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:12,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1125 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-20 22:51:12,545 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:12,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643470179] [2021-11-20 22:51:12,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643470179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:12,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056970107] [2021-11-20 22:51:12,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:12,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:12,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:12,547 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:12,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 22:51:12,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:12,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-20 22:51:12,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:13,676 INFO L134 CoverageAnalysis]: Checked inductivity of 1125 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-20 22:51:13,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:15,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1125 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-20 22:51:15,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056970107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:15,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1132938719] [2021-11-20 22:51:15,276 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 22:51:15,276 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:51:15,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:51:15,276 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:51:15,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:51:15,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-20 22:51:15,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-20 22:51:15,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 38 [2021-11-20 22:51:15,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,977 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 22:51:16,014 INFO L354 Elim1Store]: treesize reduction 112, result has 20.0 percent of original size [2021-11-20 22:51:16,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 237 treesize of output 239 [2021-11-20 22:51:16,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 22:51:16,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-20 22:51:16,516 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-20 22:51:16,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 46 [2021-11-20 22:51:16,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 22:51:16,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 22:51:16,995 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-20 22:51:16,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-20 22:51:17,147 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:51:17,824 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:51:17,824 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:51:17,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 96 [2021-11-20 22:51:17,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455011413] [2021-11-20 22:51:17,825 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:17,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-20 22:51:17,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:17,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-20 22:51:17,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4151, Invalid=6979, Unknown=0, NotChecked=0, Total=11130 [2021-11-20 22:51:17,830 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 97 states, 97 states have (on average 2.0309278350515463) internal successors, (197), 96 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:19,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:19,937 INFO L93 Difference]: Finished difference Result 808 states and 809 transitions. [2021-11-20 22:51:19,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-20 22:51:19,937 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.0309278350515463) internal successors, (197), 96 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have 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 [2021-11-20 22:51:19,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:19,942 INFO L225 Difference]: With dead ends: 808 [2021-11-20 22:51:19,942 INFO L226 Difference]: Without dead ends: 808 [2021-11-20 22:51:19,948 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 226 SyntacticMatches, 1 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7573 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=6229, Invalid=12403, Unknown=0, NotChecked=0, Total=18632 [2021-11-20 22:51:19,949 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 2576 mSDsluCounter, 578 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 395 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2576 SdHoareTripleChecker+Valid, 595 SdHoareTripleChecker+Invalid, 757 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 395 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:19,949 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2576 Valid, 595 Invalid, 757 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [395 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 22:51:19,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 808 states. [2021-11-20 22:51:19,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 808 to 208. [2021-11-20 22:51:19,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 204 states have (on average 1.0245098039215685) internal successors, (209), 207 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:19,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 209 transitions. [2021-11-20 22:51:19,958 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 209 transitions. Word has length 100 [2021-11-20 22:51:19,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:19,959 INFO L470 AbstractCegarLoop]: Abstraction has 208 states and 209 transitions. [2021-11-20 22:51:19,959 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.0309278350515463) internal successors, (197), 96 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:51:19,959 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 209 transitions. [2021-11-20 22:51:19,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2021-11-20 22:51:19,970 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:19,970 INFO L514 BasicCegarLoop]: trace histogram [62, 62, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:51:20,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 22:51:20,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 22:51:20,187 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 22:51:20,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:20,187 INFO L85 PathProgramCache]: Analyzing trace with hash -1903108465, now seen corresponding path program 2 times [2021-11-20 22:51:20,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:20,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399925832] [2021-11-20 22:51:20,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:20,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:20,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:22,082 INFO L134 CoverageAnalysis]: Checked inductivity of 4805 backedges. 0 proven. 3844 refuted. 0 times theorem prover too weak. 961 trivial. 0 not checked. [2021-11-20 22:51:22,082 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:22,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399925832] [2021-11-20 22:51:22,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399925832] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:22,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109764764] [2021-11-20 22:51:22,083 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:51:22,083 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:22,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:22,084 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:22,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:00:51,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-11-20 23:00:51,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:00:51,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-20 23:00:51,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:00:54,197 INFO L134 CoverageAnalysis]: Checked inductivity of 4805 backedges. 123 proven. 961 refuted. 0 times theorem prover too weak. 3721 trivial. 0 not checked. [2021-11-20 23:00:54,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:00:56,741 INFO L134 CoverageAnalysis]: Checked inductivity of 4805 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 3844 trivial. 0 not checked. [2021-11-20 23:00:56,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109764764] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:00:56,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1584609832] [2021-11-20 23:00:56,744 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:00:56,745 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:00:56,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:00:56,745 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:00:56,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:00:56,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:56,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:56,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:56,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:56,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:56,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-20 23:00:56,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:56,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-20 23:00:57,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:57,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:57,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:57,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 45 [2021-11-20 23:00:57,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:57,385 INFO L354 Elim1Store]: treesize reduction 189, result has 11.3 percent of original size [2021-11-20 23:00:57,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 276 treesize of output 270 [2021-11-20 23:00:57,596 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 16 treesize of output 12 [2021-11-20 23:00:57,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:00:57,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:00:57,736 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 70 treesize of output 69 [2021-11-20 23:00:57,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:00:57,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:00:58,207 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-20 23:00:58,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-20 23:00:58,311 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:01:01,191 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:01:01,191 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:01:01,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 36, 35] total 134 [2021-11-20 23:01:01,191 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171808974] [2021-11-20 23:01:01,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:01:01,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2021-11-20 23:01:01,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:01:01,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2021-11-20 23:01:01,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4358, Invalid=15948, Unknown=0, NotChecked=0, Total=20306 [2021-11-20 23:01:01,199 INFO L87 Difference]: Start difference. First operand 208 states and 209 transitions. Second operand has 134 states, 134 states have (on average 2.0522388059701493) internal successors, (275), 134 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:01:15,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:01:15,731 INFO L93 Difference]: Finished difference Result 534 states and 598 transitions. [2021-11-20 23:01:15,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 196 states. [2021-11-20 23:01:15,731 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 134 states have (on average 2.0522388059701493) internal successors, (275), 134 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 196 [2021-11-20 23:01:15,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:01:15,734 INFO L225 Difference]: With dead ends: 534 [2021-11-20 23:01:15,734 INFO L226 Difference]: Without dead ends: 403 [2021-11-20 23:01:15,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 604 SyntacticMatches, 32 SemanticMatches, 332 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32697 ImplicationChecksByTransitivity, 19.7s TimeCoverageRelationStatistics Valid=31314, Invalid=79908, Unknown=0, NotChecked=0, Total=111222 [2021-11-20 23:01:15,743 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 1698 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 1771 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1698 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 2353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1771 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:01:15,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1698 Valid, 154 Invalid, 2353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1771 Valid, 582 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 23:01:15,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-11-20 23:01:15,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 402. [2021-11-20 23:01:15,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 398 states have (on average 1.0125628140703518) internal successors, (403), 401 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:01:15,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 403 transitions. [2021-11-20 23:01:15,752 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 403 transitions. Word has length 196 [2021-11-20 23:01:15,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:01:15,753 INFO L470 AbstractCegarLoop]: Abstraction has 402 states and 403 transitions. [2021-11-20 23:01:15,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 134 states have (on average 2.0522388059701493) internal successors, (275), 134 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:01:15,753 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 403 transitions. [2021-11-20 23:01:15,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2021-11-20 23:01:15,760 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:01:15,761 INFO L514 BasicCegarLoop]: trace histogram [95, 95, 95, 95, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:01:15,842 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-20 23:01:15,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 23:01:15,975 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-20 23:01:15,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:01:15,975 INFO L85 PathProgramCache]: Analyzing trace with hash -917626766, now seen corresponding path program 3 times [2021-11-20 23:01:15,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:01:15,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724336458] [2021-11-20 23:01:15,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:01:15,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:01:16,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:01:19,759 INFO L134 CoverageAnalysis]: Checked inductivity of 18050 backedges. 0 proven. 9025 refuted. 0 times theorem prover too weak. 9025 trivial. 0 not checked. [2021-11-20 23:01:19,760 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:01:19,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724336458] [2021-11-20 23:01:19,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724336458] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:01:19,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762027960] [2021-11-20 23:01:19,760 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:01:19,760 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:01:19,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:01:19,761 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:01:19,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28f792-ae6b-455a-a8c7-12f6329b4eea/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process