./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/verifythis/duplets.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/verifythis/duplets.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ac76721ba91522692e2c3e4d1ea27df0200031dd012c5066cc7280e0ae6e2244 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 01:36:43,886 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 01:36:43,889 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 01:36:43,915 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 01:36:43,915 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 01:36:43,920 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 01:36:43,924 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 01:36:43,928 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 01:36:43,930 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 01:36:43,938 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 01:36:43,939 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 01:36:43,941 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 01:36:43,943 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 01:36:43,945 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 01:36:43,950 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 01:36:43,952 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 01:36:43,954 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 01:36:43,955 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 01:36:43,957 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 01:36:43,962 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 01:36:43,964 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 01:36:43,965 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 01:36:43,967 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 01:36:43,968 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 01:36:43,972 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 01:36:43,972 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 01:36:43,972 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 01:36:43,973 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 01:36:43,974 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 01:36:43,975 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 01:36:43,976 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 01:36:43,976 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 01:36:43,977 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 01:36:43,978 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 01:36:43,980 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 01:36:43,980 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 01:36:43,981 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 01:36:43,981 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 01:36:43,981 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 01:36:43,982 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 01:36:43,983 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 01:36:43,984 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 01:36:44,029 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 01:36:44,029 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 01:36:44,029 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 01:36:44,029 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 01:36:44,030 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 01:36:44,030 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 01:36:44,031 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 01:36:44,031 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 01:36:44,031 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 01:36:44,031 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 01:36:44,031 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 01:36:44,032 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 01:36:44,032 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 01:36:44,032 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 01:36:44,032 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 01:36:44,032 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 01:36:44,033 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 01:36:44,033 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 01:36:44,034 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 01:36:44,034 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 01:36:44,034 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 01:36:44,034 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 01:36:44,034 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 01:36:44,038 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 01:36:44,038 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 01:36:44,039 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 01:36:44,039 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 01:36:44,039 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 01:36:44,040 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 01:36:44,040 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 01:36:44,041 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 01:36:44,041 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 01:36:44,041 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:36:44,042 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 01:36:44,042 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 01:36:44,042 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 01:36:44,043 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 01:36:44,043 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 01:36:44,043 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 01:36:44,044 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 01:36:44,044 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 01:36:44,044 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ac76721ba91522692e2c3e4d1ea27df0200031dd012c5066cc7280e0ae6e2244 [2022-11-22 01:36:44,366 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 01:36:44,398 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 01:36:44,400 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 01:36:44,402 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 01:36:44,402 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 01:36:44,403 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/verifythis/duplets.c [2022-11-22 01:36:47,628 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 01:36:47,857 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 01:36:47,858 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/sv-benchmarks/c/verifythis/duplets.c [2022-11-22 01:36:47,866 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/data/109b60792/499b28a1313f45d7bfb78cfd26ee09b9/FLAGb3e0e2020 [2022-11-22 01:36:47,884 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/data/109b60792/499b28a1313f45d7bfb78cfd26ee09b9 [2022-11-22 01:36:47,887 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 01:36:47,888 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 01:36:47,890 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 01:36:47,890 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 01:36:47,894 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 01:36:47,895 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:36:47" (1/1) ... [2022-11-22 01:36:47,896 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e9e8464 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:47, skipping insertion in model container [2022-11-22 01:36:47,897 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:36:47" (1/1) ... [2022-11-22 01:36:47,905 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 01:36:47,930 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 01:36:48,138 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/sv-benchmarks/c/verifythis/duplets.c[485,498] [2022-11-22 01:36:48,195 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:36:48,212 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 01:36:48,227 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/sv-benchmarks/c/verifythis/duplets.c[485,498] [2022-11-22 01:36:48,252 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:36:48,272 INFO L208 MainTranslator]: Completed translation [2022-11-22 01:36:48,273 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48 WrapperNode [2022-11-22 01:36:48,273 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 01:36:48,274 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 01:36:48,275 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 01:36:48,275 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 01:36:48,283 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,304 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,342 INFO L138 Inliner]: procedures = 21, calls = 43, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 120 [2022-11-22 01:36:48,343 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 01:36:48,344 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 01:36:48,344 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 01:36:48,344 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 01:36:48,355 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,355 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,373 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,373 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,379 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,394 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,395 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,396 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,399 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 01:36:48,400 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 01:36:48,400 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 01:36:48,400 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 01:36:48,401 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (1/1) ... [2022-11-22 01:36:48,417 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:36:48,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:36:48,449 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 01:36:48,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 01:36:48,508 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 01:36:48,508 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-22 01:36:48,509 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-22 01:36:48,509 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 01:36:48,509 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-22 01:36:48,509 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-22 01:36:48,509 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-22 01:36:48,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 01:36:48,510 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 01:36:48,511 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-22 01:36:48,511 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-22 01:36:48,511 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-22 01:36:48,511 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-22 01:36:48,627 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 01:36:48,629 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 01:36:48,947 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 01:36:49,068 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 01:36:49,068 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-22 01:36:49,071 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:36:49 BoogieIcfgContainer [2022-11-22 01:36:49,071 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 01:36:49,073 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 01:36:49,073 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 01:36:49,085 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 01:36:49,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:36:47" (1/3) ... [2022-11-22 01:36:49,086 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61a59225 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:36:49, skipping insertion in model container [2022-11-22 01:36:49,086 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:36:48" (2/3) ... [2022-11-22 01:36:49,086 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61a59225 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:36:49, skipping insertion in model container [2022-11-22 01:36:49,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:36:49" (3/3) ... [2022-11-22 01:36:49,088 INFO L112 eAbstractionObserver]: Analyzing ICFG duplets.c [2022-11-22 01:36:49,113 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 01:36:49,114 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 01:36:49,162 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 01:36:49,169 INFO L357 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4131736d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 01:36:49,169 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 01:36:49,174 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 01:36:49,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-22 01:36:49,183 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:36:49,185 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:36:49,185 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:36:49,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:36:49,193 INFO L85 PathProgramCache]: Analyzing trace with hash -725585485, now seen corresponding path program 1 times [2022-11-22 01:36:49,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:36:49,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753528542] [2022-11-22 01:36:49,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:36:49,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:36:49,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:36:50,029 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 01:36:50,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:36:50,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753528542] [2022-11-22 01:36:50,030 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753528542] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:36:50,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334552692] [2022-11-22 01:36:50,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:36:50,031 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:36:50,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:36:50,039 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:36:50,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 01:36:50,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:36:50,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 01:36:50,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:36:50,349 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 01:36:50,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:36:50,594 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 01:36:50,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334552692] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:36:50,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1697984519] [2022-11-22 01:36:50,623 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-22 01:36:50,624 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:36:50,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:36:50,634 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:36:50,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:36:50,860 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-22 01:36:50,861 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-22 01:36:50,976 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-22 01:36:50,976 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-22 01:36:51,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:36:51,008 INFO L350 Elim1Store]: Elim1 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 22 treesize of output 22 [2022-11-22 01:36:52,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:36:52,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:36:52,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:36:52,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:36:52,108 INFO L321 Elim1Store]: treesize reduction 60, result has 33.3 percent of original size [2022-11-22 01:36:52,109 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 61 [2022-11-22 01:36:52,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:36:52,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:36:52,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:36:52,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:36:52,250 INFO L321 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2022-11-22 01:36:52,251 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 16 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 77 [2022-11-22 01:36:52,291 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:36:52,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:36:52,293 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 39 [2022-11-22 01:36:52,549 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:36:52,567 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:36:55,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1697984519] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:36:55,533 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:36:55,534 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [6, 6, 6] total 18 [2022-11-22 01:36:55,537 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66741070] [2022-11-22 01:36:55,537 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:36:55,543 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-22 01:36:55,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:36:55,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-22 01:36:55,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2022-11-22 01:36:55,579 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 01:36:56,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:36:56,452 INFO L93 Difference]: Finished difference Result 74 states and 115 transitions. [2022-11-22 01:36:56,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 01:36:56,455 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2022-11-22 01:36:56,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:36:56,465 INFO L225 Difference]: With dead ends: 74 [2022-11-22 01:36:56,465 INFO L226 Difference]: Without dead ends: 51 [2022-11-22 01:36:56,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2022-11-22 01:36:56,472 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 54 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 01:36:56,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 47 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 01:36:56,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-22 01:36:56,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 29. [2022-11-22 01:36:56,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-22 01:36:56,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2022-11-22 01:36:56,544 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 21 [2022-11-22 01:36:56,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:36:56,545 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2022-11-22 01:36:56,545 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 01:36:56,546 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2022-11-22 01:36:56,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-22 01:36:56,548 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:36:56,548 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:36:56,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 01:36:56,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-22 01:36:56,756 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:36:56,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:36:56,757 INFO L85 PathProgramCache]: Analyzing trace with hash 1300452181, now seen corresponding path program 1 times [2022-11-22 01:36:56,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:36:56,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767542573] [2022-11-22 01:36:56,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:36:56,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:36:56,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:36:57,550 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 01:36:57,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:36:57,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767542573] [2022-11-22 01:36:57,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767542573] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:36:57,551 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:36:57,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-11-22 01:36:57,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743134799] [2022-11-22 01:36:57,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:36:57,554 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 01:36:57,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:36:57,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 01:36:57,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-11-22 01:36:57,555 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand has 9 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 01:36:57,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:36:57,978 INFO L93 Difference]: Finished difference Result 61 states and 83 transitions. [2022-11-22 01:36:57,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-22 01:36:57,979 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 23 [2022-11-22 01:36:57,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:36:57,984 INFO L225 Difference]: With dead ends: 61 [2022-11-22 01:36:57,984 INFO L226 Difference]: Without dead ends: 42 [2022-11-22 01:36:57,986 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2022-11-22 01:36:57,992 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 40 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:36:57,992 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 112 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:36:57,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-22 01:36:58,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 30. [2022-11-22 01:36:58,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-22 01:36:58,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-11-22 01:36:58,060 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 23 [2022-11-22 01:36:58,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:36:58,060 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-11-22 01:36:58,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 01:36:58,061 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-11-22 01:36:58,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-22 01:36:58,062 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:36:58,062 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:36:58,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 01:36:58,062 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:36:58,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:36:58,063 INFO L85 PathProgramCache]: Analyzing trace with hash 481505076, now seen corresponding path program 1 times [2022-11-22 01:36:58,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:36:58,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835767455] [2022-11-22 01:36:58,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:36:58,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:36:58,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:36:58,129 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 01:36:58,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:36:58,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835767455] [2022-11-22 01:36:58,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835767455] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:36:58,130 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:36:58,130 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-22 01:36:58,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032937550] [2022-11-22 01:36:58,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:36:58,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-22 01:36:58,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:36:58,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-22 01:36:58,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-22 01:36:58,132 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 01:36:58,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:36:58,241 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2022-11-22 01:36:58,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 01:36:58,242 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 23 [2022-11-22 01:36:58,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:36:58,243 INFO L225 Difference]: With dead ends: 46 [2022-11-22 01:36:58,243 INFO L226 Difference]: Without dead ends: 44 [2022-11-22 01:36:58,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-22 01:36:58,245 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 14 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:36:58,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 125 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:36:58,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-22 01:36:58,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2022-11-22 01:36:58,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 01:36:58,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2022-11-22 01:36:58,275 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 23 [2022-11-22 01:36:58,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:36:58,276 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2022-11-22 01:36:58,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 01:36:58,277 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2022-11-22 01:36:58,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-22 01:36:58,278 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:36:58,278 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:36:58,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-22 01:36:58,278 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:36:58,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:36:58,279 INFO L85 PathProgramCache]: Analyzing trace with hash -829714970, now seen corresponding path program 1 times [2022-11-22 01:36:58,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:36:58,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978325538] [2022-11-22 01:36:58,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:36:58,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:36:58,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:36:58,356 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 01:36:58,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:36:58,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978325538] [2022-11-22 01:36:58,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978325538] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:36:58,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980445158] [2022-11-22 01:36:58,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:36:58,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:36:58,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:36:58,359 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:36:58,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 01:36:58,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:36:58,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 01:36:58,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:36:58,460 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 01:36:58,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:36:58,508 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 01:36:58,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980445158] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:36:58,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1543908008] [2022-11-22 01:36:58,511 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 01:36:58,511 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:36:58,512 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:36:58,527 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:36:58,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:36:58,613 INFO L321 Elim1Store]: treesize reduction 12, result has 42.9 percent of original size [2022-11-22 01:36:58,615 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 26 [2022-11-22 01:36:58,696 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-22 01:36:58,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-22 01:36:58,781 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-22 01:36:58,781 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-22 01:37:00,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:00,528 INFO L321 Elim1Store]: treesize reduction 144, result has 12.7 percent of original size [2022-11-22 01:37:00,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 382 treesize of output 387 [2022-11-22 01:37:00,729 INFO L321 Elim1Store]: treesize reduction 238, result has 9.8 percent of original size [2022-11-22 01:37:00,730 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 8 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 19 case distinctions, treesize of input 342 treesize of output 344 [2022-11-22 01:37:00,805 INFO L321 Elim1Store]: treesize reduction 82, result has 9.9 percent of original size [2022-11-22 01:37:00,806 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 341 treesize of output 338 [2022-11-22 01:37:02,556 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2022-11-22 01:37:02,561 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:37:02,576 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:37:07,757 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '765#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:37:07,757 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:37:07,758 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:37:07,758 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 5 [2022-11-22 01:37:07,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625352871] [2022-11-22 01:37:07,758 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:37:07,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:37:07,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:37:07,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:37:07,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2022-11-22 01:37:07,760 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 01:37:07,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:37:07,890 INFO L93 Difference]: Finished difference Result 62 states and 79 transitions. [2022-11-22 01:37:07,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 01:37:07,891 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 25 [2022-11-22 01:37:07,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:37:07,893 INFO L225 Difference]: With dead ends: 62 [2022-11-22 01:37:07,893 INFO L226 Difference]: Without dead ends: 46 [2022-11-22 01:37:07,893 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2022-11-22 01:37:07,896 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 21 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:37:07,897 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 88 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:37:07,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-22 01:37:07,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2022-11-22 01:37:07,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 26 states have internal predecessors, (29), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 01:37:07,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2022-11-22 01:37:07,933 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 25 [2022-11-22 01:37:07,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:37:07,933 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2022-11-22 01:37:07,934 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 01:37:07,934 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2022-11-22 01:37:07,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-22 01:37:07,935 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:37:07,935 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:37:07,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 01:37:08,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:37:08,143 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:37:08,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:37:08,143 INFO L85 PathProgramCache]: Analyzing trace with hash 16264904, now seen corresponding path program 2 times [2022-11-22 01:37:08,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:37:08,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368654519] [2022-11-22 01:37:08,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:37:08,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:37:08,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:37:09,114 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 01:37:09,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:37:09,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368654519] [2022-11-22 01:37:09,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368654519] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:37:09,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242156351] [2022-11-22 01:37:09,115 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:37:09,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:37:09,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:37:09,119 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:37:09,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 01:37:09,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 01:37:09,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:37:09,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-22 01:37:09,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:37:09,453 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-22 01:37:09,455 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 22 treesize of output 23 [2022-11-22 01:37:10,515 INFO L321 Elim1Store]: treesize reduction 12, result has 81.5 percent of original size [2022-11-22 01:37:10,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 62 [2022-11-22 01:37:10,879 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 01:37:10,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:37:11,101 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:37:11,101 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 503 treesize of output 435 [2022-11-22 01:37:14,669 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 01:37:14,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242156351] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:37:14,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1746790337] [2022-11-22 01:37:14,672 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 01:37:14,672 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:37:14,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:37:14,672 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:37:14,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:37:14,775 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-22 01:37:14,776 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-22 01:37:14,791 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 01:37:14,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:14,805 INFO L350 Elim1Store]: Elim1 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 22 treesize of output 22 [2022-11-22 01:37:15,354 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:37:15,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:15,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 39 [2022-11-22 01:37:15,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:15,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:15,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:15,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:15,484 INFO L321 Elim1Store]: treesize reduction 60, result has 33.3 percent of original size [2022-11-22 01:37:15,484 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 61 [2022-11-22 01:37:15,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:15,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:15,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:15,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:15,635 INFO L321 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2022-11-22 01:37:15,636 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 16 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 77 [2022-11-22 01:37:17,457 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2022-11-22 01:37:17,463 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:37:17,480 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:37:21,743 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1124#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:37:21,744 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:37:21,744 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:37:21,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 13] total 31 [2022-11-22 01:37:21,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339866715] [2022-11-22 01:37:21,744 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:37:21,745 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-22 01:37:21,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:37:21,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-22 01:37:21,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1856, Unknown=1, NotChecked=0, Total=2070 [2022-11-22 01:37:21,746 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand has 31 states, 21 states have (on average 1.619047619047619) internal successors, (34), 22 states have internal predecessors, (34), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-22 01:37:28,064 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:37:31,181 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.79s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:37:32,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:37:32,140 INFO L93 Difference]: Finished difference Result 126 states and 173 transitions. [2022-11-22 01:37:32,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 01:37:32,143 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 21 states have (on average 1.619047619047619) internal successors, (34), 22 states have internal predecessors, (34), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 27 [2022-11-22 01:37:32,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:37:32,145 INFO L225 Difference]: With dead ends: 126 [2022-11-22 01:37:32,145 INFO L226 Difference]: Without dead ends: 99 [2022-11-22 01:37:32,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 867 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=563, Invalid=2976, Unknown=1, NotChecked=0, Total=3540 [2022-11-22 01:37:32,148 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 397 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 537 mSolverCounterSat, 246 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 397 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 246 IncrementalHoareTripleChecker+Valid, 537 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:37:32,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [397 Valid, 355 Invalid, 785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [246 Valid, 537 Invalid, 2 Unknown, 0 Unchecked, 5.2s Time] [2022-11-22 01:37:32,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-22 01:37:32,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 43. [2022-11-22 01:37:32,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 31 states have internal predecessors, (37), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 01:37:32,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 56 transitions. [2022-11-22 01:37:32,190 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 56 transitions. Word has length 27 [2022-11-22 01:37:32,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:37:32,190 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 56 transitions. [2022-11-22 01:37:32,190 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 21 states have (on average 1.619047619047619) internal successors, (34), 22 states have internal predecessors, (34), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-22 01:37:32,191 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 56 transitions. [2022-11-22 01:37:32,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-22 01:37:32,191 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:37:32,192 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:37:32,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 01:37:32,397 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:37:32,398 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:37:32,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:37:32,398 INFO L85 PathProgramCache]: Analyzing trace with hash -473207854, now seen corresponding path program 1 times [2022-11-22 01:37:32,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:37:32,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406767982] [2022-11-22 01:37:32,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:37:32,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:37:32,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:37:32,973 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 01:37:32,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:37:32,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406767982] [2022-11-22 01:37:32,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406767982] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:37:32,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428165945] [2022-11-22 01:37:32,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:37:32,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:37:32,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:37:32,977 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:37:32,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 01:37:33,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:37:33,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-22 01:37:33,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:37:33,083 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-22 01:37:33,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 14 [2022-11-22 01:37:33,252 INFO L350 Elim1Store]: Elim1 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 23 treesize of output 23 [2022-11-22 01:37:33,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 39 [2022-11-22 01:37:33,628 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 01:37:33,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:37:33,846 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:37:33,846 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 21 [2022-11-22 01:37:33,855 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:37:33,855 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 37 [2022-11-22 01:37:33,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-22 01:37:33,882 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:37:33,882 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2022-11-22 01:37:33,885 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:37:33,887 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2022-11-22 01:37:34,098 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 01:37:34,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [428165945] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:37:34,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1980956993] [2022-11-22 01:37:34,101 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-22 01:37:34,101 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:37:34,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:37:34,102 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:37:34,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:37:34,204 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-22 01:37:34,205 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-22 01:37:34,238 INFO L321 Elim1Store]: treesize reduction 12, result has 42.9 percent of original size [2022-11-22 01:37:34,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 26 [2022-11-22 01:37:34,313 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-22 01:37:34,314 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-22 01:37:35,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:35,547 INFO L321 Elim1Store]: treesize reduction 144, result has 12.7 percent of original size [2022-11-22 01:37:35,548 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 382 treesize of output 387 [2022-11-22 01:37:35,713 INFO L321 Elim1Store]: treesize reduction 238, result has 9.8 percent of original size [2022-11-22 01:37:35,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 8 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 19 case distinctions, treesize of input 342 treesize of output 344 [2022-11-22 01:37:35,773 INFO L321 Elim1Store]: treesize reduction 82, result has 9.9 percent of original size [2022-11-22 01:37:35,773 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 341 treesize of output 338 [2022-11-22 01:37:36,165 INFO L321 Elim1Store]: treesize reduction 101, result has 12.2 percent of original size [2022-11-22 01:37:36,165 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 393 treesize of output 386 [2022-11-22 01:37:36,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:37:36,257 INFO L321 Elim1Store]: treesize reduction 74, result has 12.9 percent of original size [2022-11-22 01:37:36,258 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 385 treesize of output 383 [2022-11-22 01:37:36,275 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-22 01:37:36,358 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-22 01:37:38,667 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-22 01:37:38,679 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:37:38,693 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:37:50,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1630#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:37:50,943 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:37:50,943 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:37:50,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 12] total 30 [2022-11-22 01:37:50,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949624563] [2022-11-22 01:37:50,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:37:50,944 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-22 01:37:50,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:37:50,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-22 01:37:50,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=1953, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 01:37:50,945 INFO L87 Difference]: Start difference. First operand 43 states and 56 transitions. Second operand has 30 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 5 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-22 01:37:53,025 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:37:54,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:37:54,636 INFO L93 Difference]: Finished difference Result 75 states and 94 transitions. [2022-11-22 01:37:54,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 01:37:54,637 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 5 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 29 [2022-11-22 01:37:54,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:37:54,640 INFO L225 Difference]: With dead ends: 75 [2022-11-22 01:37:54,641 INFO L226 Difference]: Without dead ends: 73 [2022-11-22 01:37:54,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1220 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=685, Invalid=4007, Unknown=0, NotChecked=0, Total=4692 [2022-11-22 01:37:54,645 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 196 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 154 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-22 01:37:54,645 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [196 Valid, 120 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 470 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2022-11-22 01:37:54,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-22 01:37:54,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 51. [2022-11-22 01:37:54,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 37 states have internal predecessors, (44), 10 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 01:37:54,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 63 transitions. [2022-11-22 01:37:54,703 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 63 transitions. Word has length 29 [2022-11-22 01:37:54,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:37:54,704 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 63 transitions. [2022-11-22 01:37:54,704 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 5 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-22 01:37:54,704 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 63 transitions. [2022-11-22 01:37:54,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-22 01:37:54,705 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:37:54,705 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:37:54,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 01:37:54,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-22 01:37:54,912 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:37:54,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:37:54,912 INFO L85 PathProgramCache]: Analyzing trace with hash 94136571, now seen corresponding path program 3 times [2022-11-22 01:37:54,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:37:54,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169867655] [2022-11-22 01:37:54,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:37:54,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:37:54,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:37:54,978 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-22 01:37:54,979 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:37:54,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169867655] [2022-11-22 01:37:54,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169867655] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:37:54,979 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:37:54,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 01:37:54,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799572676] [2022-11-22 01:37:54,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:37:54,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 01:37:54,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:37:54,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 01:37:54,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 01:37:54,983 INFO L87 Difference]: Start difference. First operand 51 states and 63 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 01:37:55,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:37:55,118 INFO L93 Difference]: Finished difference Result 107 states and 134 transitions. [2022-11-22 01:37:55,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 01:37:55,119 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 31 [2022-11-22 01:37:55,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:37:55,124 INFO L225 Difference]: With dead ends: 107 [2022-11-22 01:37:55,124 INFO L226 Difference]: Without dead ends: 71 [2022-11-22 01:37:55,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-22 01:37:55,128 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 14 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:37:55,129 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 102 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:37:55,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-22 01:37:55,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 52. [2022-11-22 01:37:55,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 38 states have internal predecessors, (44), 10 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 01:37:55,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 63 transitions. [2022-11-22 01:37:55,185 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 63 transitions. Word has length 31 [2022-11-22 01:37:55,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:37:55,186 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 63 transitions. [2022-11-22 01:37:55,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 01:37:55,186 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 63 transitions. [2022-11-22 01:37:55,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-22 01:37:55,192 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:37:55,192 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:37:55,193 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-22 01:37:55,193 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:37:55,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:37:55,193 INFO L85 PathProgramCache]: Analyzing trace with hash 1674392140, now seen corresponding path program 4 times [2022-11-22 01:37:55,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:37:55,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008940847] [2022-11-22 01:37:55,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:37:55,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:37:55,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:37:58,068 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 01:37:58,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:37:58,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008940847] [2022-11-22 01:37:58,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008940847] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:37:58,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3989720] [2022-11-22 01:37:58,069 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:37:58,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:37:58,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:37:58,070 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:37:58,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 01:37:58,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:37:58,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-22 01:37:58,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:37:58,175 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 6 [2022-11-22 01:37:58,524 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2022-11-22 01:37:59,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 73 [2022-11-22 01:37:59,699 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 19 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 01:37:59,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:38:00,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3989720] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:38:00,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [314174477] [2022-11-22 01:38:00,481 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 01:38:00,481 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:38:00,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:38:00,481 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:38:00,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:38:00,544 INFO L321 Elim1Store]: treesize reduction 12, result has 42.9 percent of original size [2022-11-22 01:38:00,545 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 26 [2022-11-22 01:38:00,606 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-22 01:38:00,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-22 01:38:00,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 01:38:01,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:38:01,663 INFO L321 Elim1Store]: treesize reduction 144, result has 12.7 percent of original size [2022-11-22 01:38:01,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 382 treesize of output 387 [2022-11-22 01:38:01,728 INFO L321 Elim1Store]: treesize reduction 82, result has 9.9 percent of original size [2022-11-22 01:38:01,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 395 treesize of output 392 [2022-11-22 01:38:01,884 INFO L321 Elim1Store]: treesize reduction 238, result has 9.8 percent of original size [2022-11-22 01:38:01,884 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 8 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 19 case distinctions, treesize of input 338 treesize of output 340 [2022-11-22 01:38:03,123 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2022-11-22 01:38:03,127 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:38:03,141 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:38:09,506 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2320#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:38:09,506 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:38:09,507 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:38:09,507 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 26 [2022-11-22 01:38:09,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481736544] [2022-11-22 01:38:09,507 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:38:09,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-22 01:38:09,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:38:09,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-22 01:38:09,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=2310, Unknown=0, NotChecked=0, Total=2550 [2022-11-22 01:38:09,509 INFO L87 Difference]: Start difference. First operand 52 states and 63 transitions. Second operand has 26 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 25 states have internal predecessors, (34), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-22 01:38:20,115 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result VALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:38:20,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:38:20,431 INFO L93 Difference]: Finished difference Result 120 states and 152 transitions. [2022-11-22 01:38:20,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-22 01:38:20,432 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 25 states have internal predecessors, (34), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 33 [2022-11-22 01:38:20,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:38:20,434 INFO L225 Difference]: With dead ends: 120 [2022-11-22 01:38:20,434 INFO L226 Difference]: Without dead ends: 85 [2022-11-22 01:38:20,436 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1389 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=485, Invalid=3937, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 01:38:20,437 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 83 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 735 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:38:20,437 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 286 Invalid, 800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 735 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-11-22 01:38:20,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-22 01:38:20,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 65. [2022-11-22 01:38:20,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 48 states have (on average 1.2916666666666667) internal successors, (62), 50 states have internal predecessors, (62), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 01:38:20,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 81 transitions. [2022-11-22 01:38:20,494 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 81 transitions. Word has length 33 [2022-11-22 01:38:20,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:38:20,494 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 81 transitions. [2022-11-22 01:38:20,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 25 states have internal predecessors, (34), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-22 01:38:20,495 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 81 transitions. [2022-11-22 01:38:20,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-22 01:38:20,496 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:38:20,496 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:38:20,503 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-22 01:38:20,702 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:38:20,703 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:38:20,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:38:20,703 INFO L85 PathProgramCache]: Analyzing trace with hash -1738145042, now seen corresponding path program 1 times [2022-11-22 01:38:20,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:38:20,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918505210] [2022-11-22 01:38:20,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:38:20,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:38:20,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:38:21,079 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 01:38:21,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:38:21,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918505210] [2022-11-22 01:38:21,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918505210] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:38:21,080 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:38:21,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-11-22 01:38:21,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657313277] [2022-11-22 01:38:21,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:38:21,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 01:38:21,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:38:21,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 01:38:21,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2022-11-22 01:38:21,081 INFO L87 Difference]: Start difference. First operand 65 states and 81 transitions. Second operand has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 01:38:21,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:38:21,425 INFO L93 Difference]: Finished difference Result 81 states and 100 transitions. [2022-11-22 01:38:21,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 01:38:21,426 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 35 [2022-11-22 01:38:21,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:38:21,430 INFO L225 Difference]: With dead ends: 81 [2022-11-22 01:38:21,430 INFO L226 Difference]: Without dead ends: 79 [2022-11-22 01:38:21,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-11-22 01:38:21,433 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 21 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:38:21,433 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 178 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:38:21,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-22 01:38:21,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 75. [2022-11-22 01:38:21,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 57 states have internal predecessors, (68), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-22 01:38:21,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 93 transitions. [2022-11-22 01:38:21,522 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 93 transitions. Word has length 35 [2022-11-22 01:38:21,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:38:21,522 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 93 transitions. [2022-11-22 01:38:21,523 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 01:38:21,523 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 93 transitions. [2022-11-22 01:38:21,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-22 01:38:21,527 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:38:21,528 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:38:21,528 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-22 01:38:21,528 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:38:21,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:38:21,529 INFO L85 PathProgramCache]: Analyzing trace with hash -173484946, now seen corresponding path program 5 times [2022-11-22 01:38:21,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:38:21,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207366570] [2022-11-22 01:38:21,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:38:21,529 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:38:21,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:38:21,630 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-22 01:38:21,630 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:38:21,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207366570] [2022-11-22 01:38:21,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207366570] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:38:21,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134640328] [2022-11-22 01:38:21,631 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:38:21,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:38:21,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:38:21,633 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:38:21,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 01:38:21,896 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-22 01:38:21,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:38:21,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-22 01:38:21,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:38:21,912 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 6 [2022-11-22 01:38:22,120 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2022-11-22 01:38:22,484 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 54 [2022-11-22 01:38:35,080 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 15 proven. 23 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 01:38:35,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:38:37,577 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 25 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 01:38:37,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134640328] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:38:37,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [217078902] [2022-11-22 01:38:37,580 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 01:38:37,580 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:38:37,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:38:37,580 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:38:37,581 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:38:37,639 INFO L321 Elim1Store]: treesize reduction 12, result has 42.9 percent of original size [2022-11-22 01:38:37,640 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 26 [2022-11-22 01:38:37,701 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-22 01:38:37,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-22 01:38:37,725 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-22 01:38:38,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:38:38,771 INFO L321 Elim1Store]: treesize reduction 144, result has 12.7 percent of original size [2022-11-22 01:38:38,772 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 382 treesize of output 387 [2022-11-22 01:38:38,929 INFO L321 Elim1Store]: treesize reduction 238, result has 9.8 percent of original size [2022-11-22 01:38:38,929 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 8 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 19 case distinctions, treesize of input 342 treesize of output 344 [2022-11-22 01:38:39,000 INFO L321 Elim1Store]: treesize reduction 82, result has 9.9 percent of original size [2022-11-22 01:38:39,000 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 341 treesize of output 338 [2022-11-22 01:38:40,392 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2022-11-22 01:38:40,397 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:38:40,417 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:38:47,154 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3144#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:38:47,154 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:38:47,155 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:38:47,155 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 14, 9] total 25 [2022-11-22 01:38:47,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567102959] [2022-11-22 01:38:47,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:38:47,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-22 01:38:47,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:38:47,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-22 01:38:47,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1387, Unknown=6, NotChecked=0, Total=1560 [2022-11-22 01:38:47,157 INFO L87 Difference]: Start difference. First operand 75 states and 93 transitions. Second operand has 25 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 24 states have internal predecessors, (45), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-22 01:38:49,376 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:38:51,393 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:38:55,473 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:38:59,875 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:01,936 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:03,945 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:13,271 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:15,284 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:17,293 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:24,841 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:26,881 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:28,892 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:32,972 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:34,978 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:36,986 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:39:57,607 WARN L233 SmtUtils]: Spent 8.21s on a formula simplification. DAG size of input: 71 DAG size of output: 67 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:39:59,659 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:40:01,665 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:40:08,162 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:40:09,229 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:40:38,231 WARN L233 SmtUtils]: Spent 12.91s on a formula simplification. DAG size of input: 86 DAG size of output: 82 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:40:40,235 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:40:42,244 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:41:00,438 WARN L233 SmtUtils]: Spent 8.10s on a formula simplification. DAG size of input: 67 DAG size of output: 63 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:41:11,396 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:41:31,666 WARN L233 SmtUtils]: Spent 8.12s on a formula simplification. DAG size of input: 61 DAG size of output: 57 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:42:04,333 WARN L233 SmtUtils]: Spent 12.26s on a formula simplification. DAG size of input: 76 DAG size of output: 72 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:42:12,496 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:42:14,654 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:42:16,677 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:42:18,700 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:42:20,707 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:42:22,718 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:42:48,585 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:42:50,655 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:42:52,669 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:42:54,677 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:42:56,684 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:00,734 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:02,752 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:04,809 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:07,609 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:09,647 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:11,656 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:13,668 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:15,680 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:17,710 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:19,775 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:43:19,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:43:19,809 INFO L93 Difference]: Finished difference Result 117 states and 147 transitions. [2022-11-22 01:43:19,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 01:43:19,810 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 24 states have internal predecessors, (45), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 37 [2022-11-22 01:43:19,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:43:19,811 INFO L225 Difference]: With dead ends: 117 [2022-11-22 01:43:19,812 INFO L226 Difference]: Without dead ends: 92 [2022-11-22 01:43:19,813 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 925 ImplicationChecksByTransitivity, 206.6s TimeCoverageRelationStatistics Valid=482, Invalid=2880, Unknown=60, NotChecked=0, Total=3422 [2022-11-22 01:43:19,813 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 87 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 98 mSolverCounterUnsat, 42 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 87.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 42 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 87.7s IncrementalHoareTripleChecker+Time [2022-11-22 01:43:19,814 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 273 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 303 Invalid, 42 Unknown, 0 Unchecked, 87.7s Time] [2022-11-22 01:43:19,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-22 01:43:19,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 64. [2022-11-22 01:43:19,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 47 states have internal predecessors, (56), 12 states have call successors, (12), 6 states have call predecessors, (12), 6 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-22 01:43:19,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 79 transitions. [2022-11-22 01:43:19,864 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 79 transitions. Word has length 37 [2022-11-22 01:43:19,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:43:19,864 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 79 transitions. [2022-11-22 01:43:19,864 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 24 states have internal predecessors, (45), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-22 01:43:19,865 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 79 transitions. [2022-11-22 01:43:19,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-22 01:43:19,865 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:43:19,866 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:43:19,872 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 01:43:20,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:43:20,072 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:43:20,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:43:20,073 INFO L85 PathProgramCache]: Analyzing trace with hash -2011066031, now seen corresponding path program 1 times [2022-11-22 01:43:20,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:43:20,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735382666] [2022-11-22 01:43:20,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:43:20,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:43:20,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:43:20,612 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 01:43:20,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:43:20,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735382666] [2022-11-22 01:43:20,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735382666] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:43:20,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640784127] [2022-11-22 01:43:20,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:43:20,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:43:20,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:43:20,615 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:43:20,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 01:43:20,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:43:20,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-22 01:43:20,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:43:20,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-22 01:43:20,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:20,916 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-22 01:43:20,920 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2022-11-22 01:43:20,924 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-22 01:43:20,932 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-22 01:43:21,360 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-22 01:43:21,361 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 17 [2022-11-22 01:43:21,438 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 01:43:21,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:43:21,639 INFO L321 Elim1Store]: treesize reduction 13, result has 69.0 percent of original size [2022-11-22 01:43:21,640 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 94 treesize of output 87 [2022-11-22 01:43:21,648 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:43:21,648 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 59 [2022-11-22 01:43:21,703 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:43:21,704 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 183 treesize of output 211 [2022-11-22 01:43:21,747 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:43:21,747 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 153 treesize of output 167 [2022-11-22 01:43:22,750 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2022-11-22 01:43:22,758 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-22 01:43:23,027 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-22 01:43:23,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2022-11-22 01:43:23,056 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-22 01:43:23,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 22 [2022-11-22 01:43:23,222 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2022-11-22 01:43:23,317 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:43:23,318 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 402 treesize of output 379 [2022-11-22 01:43:23,428 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:43:23,428 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 109 treesize of output 106 [2022-11-22 01:43:23,551 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:43:23,551 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 228 treesize of output 213 [2022-11-22 01:43:23,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:23,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:23,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:23,656 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:43:23,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 50 [2022-11-22 01:43:23,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:23,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:23,761 INFO L321 Elim1Store]: treesize reduction 8, result has 68.0 percent of original size [2022-11-22 01:43:23,762 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 392 treesize of output 350 [2022-11-22 01:43:24,053 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-22 01:43:24,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:24,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:24,094 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-22 01:43:24,102 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2022-11-22 01:43:24,168 INFO L321 Elim1Store]: treesize reduction 8, result has 68.0 percent of original size [2022-11-22 01:43:24,168 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 79 [2022-11-22 01:43:24,273 INFO L321 Elim1Store]: treesize reduction 5, result has 16.7 percent of original size [2022-11-22 01:43:24,273 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 1 [2022-11-22 01:43:24,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:24,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:24,559 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 01:43:24,560 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640784127] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:43:24,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1103655601] [2022-11-22 01:43:24,562 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 01:43:24,562 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:43:24,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:43:24,563 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:43:24,563 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:43:24,656 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-22 01:43:24,657 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-22 01:43:24,727 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-22 01:43:24,727 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-22 01:43:24,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:24,751 INFO L350 Elim1Store]: Elim1 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 22 treesize of output 22 [2022-11-22 01:43:25,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,225 INFO L321 Elim1Store]: treesize reduction 60, result has 33.3 percent of original size [2022-11-22 01:43:25,226 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 61 [2022-11-22 01:43:25,251 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:43:25,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,253 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 39 [2022-11-22 01:43:25,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,393 INFO L321 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2022-11-22 01:43:25,393 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 16 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 9 case distinctions, treesize of input 49 treesize of output 77 [2022-11-22 01:43:25,522 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:43:25,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,529 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-22 01:43:25,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:25,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 58 [2022-11-22 01:43:25,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-22 01:43:25,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-22 01:43:27,350 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 171 for LOIs [2022-11-22 01:43:27,757 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:43:27,771 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:43:41,762 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3742#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:43:41,762 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:43:41,762 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:43:41,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 11] total 28 [2022-11-22 01:43:41,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843259512] [2022-11-22 01:43:41,762 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:43:41,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-22 01:43:41,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:43:41,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-22 01:43:41,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=1973, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 01:43:41,765 INFO L87 Difference]: Start difference. First operand 64 states and 79 transitions. Second operand has 28 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 26 states have internal predecessors, (44), 8 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 6 states have call successors, (11) [2022-11-22 01:43:43,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:43:43,115 INFO L93 Difference]: Finished difference Result 116 states and 135 transitions. [2022-11-22 01:43:43,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 01:43:43,115 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 26 states have internal predecessors, (44), 8 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 6 states have call successors, (11) Word has length 41 [2022-11-22 01:43:43,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:43:43,117 INFO L225 Difference]: With dead ends: 116 [2022-11-22 01:43:43,117 INFO L226 Difference]: Without dead ends: 112 [2022-11-22 01:43:43,118 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1431 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=480, Invalid=3302, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 01:43:43,119 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 129 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 539 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 01:43:43,119 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [133 Valid, 197 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 539 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 01:43:43,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-11-22 01:43:43,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 104. [2022-11-22 01:43:43,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 71 states have (on average 1.1549295774647887) internal successors, (82), 74 states have internal predecessors, (82), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-22 01:43:43,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 122 transitions. [2022-11-22 01:43:43,229 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 122 transitions. Word has length 41 [2022-11-22 01:43:43,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:43:43,231 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 122 transitions. [2022-11-22 01:43:43,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 26 states have internal predecessors, (44), 8 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 6 states have call successors, (11) [2022-11-22 01:43:43,232 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 122 transitions. [2022-11-22 01:43:43,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-22 01:43:43,234 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:43:43,234 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:43:43,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 01:43:43,440 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 01:43:43,440 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:43:43,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:43:43,441 INFO L85 PathProgramCache]: Analyzing trace with hash -1764670862, now seen corresponding path program 1 times [2022-11-22 01:43:43,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:43:43,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699546679] [2022-11-22 01:43:43,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:43:43,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:43:43,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:43:43,955 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 01:43:43,955 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:43:43,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699546679] [2022-11-22 01:43:43,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699546679] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:43:43,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96165299] [2022-11-22 01:43:43,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:43:43,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:43:43,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:43:43,959 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:43:43,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 01:43:44,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:43:44,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-22 01:43:44,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:43:44,439 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2022-11-22 01:43:44,440 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2022-11-22 01:43:44,447 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-22 01:43:44,457 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2022-11-22 01:43:44,505 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 9 [2022-11-22 01:43:44,509 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2022-11-22 01:43:44,933 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 39 [2022-11-22 01:43:45,003 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 01:43:45,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:43:45,243 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:43:45,243 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 110 treesize of output 112 [2022-11-22 01:43:45,247 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 124 [2022-11-22 01:43:45,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 61 treesize of output 59 [2022-11-22 01:43:45,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-22 01:43:45,315 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 65 [2022-11-22 01:43:45,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:45,371 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 26 [2022-11-22 01:43:45,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:45,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:45,795 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 01:43:45,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96165299] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:43:45,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [940964841] [2022-11-22 01:43:45,797 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 01:43:45,798 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:43:45,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:43:45,798 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:43:45,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:43:45,917 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-22 01:43:45,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-22 01:43:45,952 INFO L321 Elim1Store]: treesize reduction 12, result has 42.9 percent of original size [2022-11-22 01:43:45,952 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 26 [2022-11-22 01:43:46,034 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-22 01:43:46,034 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-22 01:43:47,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:43:47,171 INFO L321 Elim1Store]: treesize reduction 144, result has 12.7 percent of original size [2022-11-22 01:43:47,172 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 382 treesize of output 387 [2022-11-22 01:43:47,340 INFO L321 Elim1Store]: treesize reduction 238, result has 9.8 percent of original size [2022-11-22 01:43:47,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 8 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 19 case distinctions, treesize of input 342 treesize of output 344 [2022-11-22 01:43:47,432 INFO L321 Elim1Store]: treesize reduction 82, result has 9.9 percent of original size [2022-11-22 01:43:47,432 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 341 treesize of output 338 [2022-11-22 01:43:48,180 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:43:48,196 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-22 01:43:48,196 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 27 treesize of output 19 [2022-11-22 01:43:49,556 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-22 01:43:49,565 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:43:49,578 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:43:58,414 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4388#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:43:58,414 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:43:58,414 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:43:58,414 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17, 15] total 36 [2022-11-22 01:43:58,414 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640144175] [2022-11-22 01:43:58,415 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:43:58,415 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-22 01:43:58,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:43:58,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-22 01:43:58,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=2836, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 01:43:58,418 INFO L87 Difference]: Start difference. First operand 104 states and 122 transitions. Second operand has 36 states, 33 states have (on average 1.7878787878787878) internal successors, (59), 35 states have internal predecessors, (59), 7 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-22 01:43:59,841 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.35s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:44:01,262 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:44:03,521 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-22 01:44:05,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:44:05,716 INFO L93 Difference]: Finished difference Result 118 states and 135 transitions. [2022-11-22 01:44:05,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-22 01:44:05,716 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 1.7878787878787878) internal successors, (59), 35 states have internal predecessors, (59), 7 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 6 states have call successors, (10) Word has length 41 [2022-11-22 01:44:05,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:44:05,718 INFO L225 Difference]: With dead ends: 118 [2022-11-22 01:44:05,718 INFO L226 Difference]: Without dead ends: 116 [2022-11-22 01:44:05,720 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1900 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=738, Invalid=6068, Unknown=0, NotChecked=0, Total=6806 [2022-11-22 01:44:05,720 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 183 mSDsluCounter, 394 mSDsCounter, 0 mSdLazyCounter, 985 mSolverCounterSat, 167 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 1155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 985 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2022-11-22 01:44:05,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 426 Invalid, 1155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 985 Invalid, 3 Unknown, 0 Unchecked, 5.7s Time] [2022-11-22 01:44:05,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-22 01:44:05,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 108. [2022-11-22 01:44:05,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 74 states have (on average 1.1486486486486487) internal successors, (85), 77 states have internal predecessors, (85), 21 states have call successors, (21), 13 states have call predecessors, (21), 12 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-22 01:44:05,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 125 transitions. [2022-11-22 01:44:05,797 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 125 transitions. Word has length 41 [2022-11-22 01:44:05,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:44:05,797 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 125 transitions. [2022-11-22 01:44:05,797 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 1.7878787878787878) internal successors, (59), 35 states have internal predecessors, (59), 7 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-22 01:44:05,797 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 125 transitions. [2022-11-22 01:44:05,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-22 01:44:05,798 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:44:05,798 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:44:05,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 01:44:05,999 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-22 01:44:05,999 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:44:05,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:44:05,999 INFO L85 PathProgramCache]: Analyzing trace with hash -1391832462, now seen corresponding path program 1 times [2022-11-22 01:44:05,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:44:05,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727762260] [2022-11-22 01:44:06,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:44:06,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:44:06,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:44:07,074 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-22 01:44:07,074 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:44:07,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727762260] [2022-11-22 01:44:07,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1727762260] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:44:07,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378433301] [2022-11-22 01:44:07,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:44:07,075 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:44:07,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:44:07,079 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:44:07,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51f38567-a264-4b0e-85a7-eb1dad278a7a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 01:44:07,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:44:07,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 94 conjunts are in the unsatisfiable core [2022-11-22 01:44:07,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:44:07,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-22 01:44:07,475 INFO L321 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2022-11-22 01:44:07,475 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 22 treesize of output 31 [2022-11-22 01:44:07,504 INFO L321 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2022-11-22 01:44:07,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 20 treesize of output 22 [2022-11-22 01:44:07,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 01:44:07,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 34 [2022-11-22 01:44:08,984 INFO L321 Elim1Store]: treesize reduction 38, result has 22.4 percent of original size [2022-11-22 01:44:08,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 8 new quantified variables, introduced 6 case distinctions, treesize of input 52 treesize of output 36 [2022-11-22 01:44:09,043 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 01:44:09,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:44:09,538 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 01:44:09,563 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 01:44:09,564 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 179924 treesize of output 174724 [2022-11-22 01:44:20,030 WARN L233 SmtUtils]: Spent 10.46s on a formula simplification. DAG size of input: 397 DAG size of output: 394 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)