./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 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_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh --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 64e2b591ee375a99f019d69fefe326e9fd46db25f76a67e4f3bee333adbec68f --- 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-2329fc7 [2022-12-14 12:01:40,039 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 12:01:40,041 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 12:01:40,060 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 12:01:40,060 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 12:01:40,061 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 12:01:40,062 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 12:01:40,064 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 12:01:40,065 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 12:01:40,066 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 12:01:40,067 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 12:01:40,068 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 12:01:40,068 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 12:01:40,069 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 12:01:40,070 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 12:01:40,071 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 12:01:40,072 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 12:01:40,073 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 12:01:40,074 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 12:01:40,076 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 12:01:40,077 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 12:01:40,078 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 12:01:40,079 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 12:01:40,080 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 12:01:40,083 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 12:01:40,083 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 12:01:40,084 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 12:01:40,085 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 12:01:40,085 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 12:01:40,086 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 12:01:40,086 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 12:01:40,087 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 12:01:40,088 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 12:01:40,088 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 12:01:40,089 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 12:01:40,089 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 12:01:40,090 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 12:01:40,090 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 12:01:40,090 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 12:01:40,091 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 12:01:40,092 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 12:01:40,093 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 12:01:40,112 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 12:01:40,112 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 12:01:40,112 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 12:01:40,112 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 12:01:40,113 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 12:01:40,113 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 12:01:40,113 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 12:01:40,114 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 12:01:40,114 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 12:01:40,114 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 12:01:40,114 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 12:01:40,114 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 12:01:40,114 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 12:01:40,114 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 12:01:40,115 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 12:01:40,115 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 12:01:40,115 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 12:01:40,115 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 12:01:40,116 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 12:01:40,116 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 12:01:40,116 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 12:01:40,116 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 12:01:40,116 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 12:01:40,117 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 12:01:40,117 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 12:01:40,117 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 12:01:40,117 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 12:01:40,117 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 12:01:40,117 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 12:01:40,117 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 12:01:40,118 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 12:01:40,118 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 12:01:40,118 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:01:40,118 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 12:01:40,118 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 12:01:40,118 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 12:01:40,119 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 12:01:40,119 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 12:01:40,119 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 12:01:40,119 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 12:01:40,119 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 12:01:40,119 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_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 64e2b591ee375a99f019d69fefe326e9fd46db25f76a67e4f3bee333adbec68f [2022-12-14 12:01:40,299 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 12:01:40,320 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 12:01:40,322 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 12:01:40,323 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 12:01:40,324 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 12:01:40,325 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-crafted/zero_sum_m2.c [2022-12-14 12:01:42,949 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 12:01:43,060 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 12:01:43,060 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/sv-benchmarks/c/array-crafted/zero_sum_m2.c [2022-12-14 12:01:43,064 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/data/0d7c96eb6/48887bf58af14bc9ad7f549362032288/FLAG24c639a4f [2022-12-14 12:01:43,076 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/data/0d7c96eb6/48887bf58af14bc9ad7f549362032288 [2022-12-14 12:01:43,078 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 12:01:43,079 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 12:01:43,080 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 12:01:43,081 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 12:01:43,083 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 12:01:43,084 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,084 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@112851a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43, skipping insertion in model container [2022-12-14 12:01:43,085 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,090 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 12:01:43,102 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 12:01:43,228 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_cc6b110d-e479-4cdf-bef1-b6d05791890b/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2022-12-14 12:01:43,245 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:01:43,253 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 12:01:43,265 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_cc6b110d-e479-4cdf-bef1-b6d05791890b/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2022-12-14 12:01:43,272 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:01:43,285 INFO L208 MainTranslator]: Completed translation [2022-12-14 12:01:43,285 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43 WrapperNode [2022-12-14 12:01:43,285 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 12:01:43,286 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 12:01:43,286 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 12:01:43,286 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 12:01:43,292 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,297 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,309 INFO L138 Inliner]: procedures = 15, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2022-12-14 12:01:43,310 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 12:01:43,310 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 12:01:43,310 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 12:01:43,310 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 12:01:43,317 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,317 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,318 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,318 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,322 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,324 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,325 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,326 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,327 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 12:01:43,328 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 12:01:43,328 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 12:01:43,328 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 12:01:43,328 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (1/1) ... [2022-12-14 12:01:43,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:01:43,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:01:43,351 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 12:01:43,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 12:01:43,378 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 12:01:43,379 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 12:01:43,379 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 12:01:43,379 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 12:01:43,379 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 12:01:43,379 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 12:01:43,379 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 12:01:43,379 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 12:01:43,433 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 12:01:43,434 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 12:01:43,549 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 12:01:43,577 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 12:01:43,577 INFO L300 CfgBuilder]: Removed 5 assume(true) statements. [2022-12-14 12:01:43,579 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:01:43 BoogieIcfgContainer [2022-12-14 12:01:43,579 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 12:01:43,580 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 12:01:43,580 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 12:01:43,583 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 12:01:43,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 12:01:43" (1/3) ... [2022-12-14 12:01:43,583 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@409d5b71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:01:43, skipping insertion in model container [2022-12-14 12:01:43,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:01:43" (2/3) ... [2022-12-14 12:01:43,584 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@409d5b71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:01:43, skipping insertion in model container [2022-12-14 12:01:43,584 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:01:43" (3/3) ... [2022-12-14 12:01:43,585 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m2.c [2022-12-14 12:01:43,598 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 12:01:43,598 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 12:01:43,630 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 12:01:43,635 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;@5e94450c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 12:01:43,635 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 12:01:43,638 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:43,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 12:01:43,643 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:43,644 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:43,644 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:43,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:43,648 INFO L85 PathProgramCache]: Analyzing trace with hash -935721337, now seen corresponding path program 1 times [2022-12-14 12:01:43,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:43,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532396250] [2022-12-14 12:01:43,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:43,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:43,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:43,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:01:43,818 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:43,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532396250] [2022-12-14 12:01:43,819 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532396250] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:01:43,819 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:01:43,820 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:01:43,821 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101257522] [2022-12-14 12:01:43,822 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:01:43,826 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:01:43,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:01:43,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:01:43,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:01:43,850 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:43,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:01:43,891 INFO L93 Difference]: Finished difference Result 24 states and 35 transitions. [2022-12-14 12:01:43,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:01:43,893 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 12:01:43,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:01:43,900 INFO L225 Difference]: With dead ends: 24 [2022-12-14 12:01:43,900 INFO L226 Difference]: Without dead ends: 11 [2022-12-14 12:01:43,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:01:43,905 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:01:43,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:01:43,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-12-14 12:01:43,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-12-14 12:01:43,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:43,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 15 transitions. [2022-12-14 12:01:43,927 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 15 transitions. Word has length 9 [2022-12-14 12:01:43,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:01:43,927 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 15 transitions. [2022-12-14 12:01:43,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:43,928 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 15 transitions. [2022-12-14 12:01:43,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 12:01:43,928 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:43,928 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:43,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 12:01:43,929 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:43,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:43,929 INFO L85 PathProgramCache]: Analyzing trace with hash 1826524559, now seen corresponding path program 1 times [2022-12-14 12:01:43,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:43,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363337776] [2022-12-14 12:01:43,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:43,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:43,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:44,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 12:01:44,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:44,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363337776] [2022-12-14 12:01:44,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1363337776] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:01:44,011 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:01:44,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 12:01:44,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997227383] [2022-12-14 12:01:44,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:01:44,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 12:01:44,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:01:44,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 12:01:44,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 12:01:44,014 INFO L87 Difference]: Start difference. First operand 11 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:44,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:01:44,049 INFO L93 Difference]: Finished difference Result 21 states and 31 transitions. [2022-12-14 12:01:44,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 12:01:44,050 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 12:01:44,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:01:44,050 INFO L225 Difference]: With dead ends: 21 [2022-12-14 12:01:44,050 INFO L226 Difference]: Without dead ends: 15 [2022-12-14 12:01:44,050 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 12:01:44,051 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:01:44,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 5 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:01:44,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-12-14 12:01:44,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-12-14 12:01:44,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:44,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2022-12-14 12:01:44,055 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 10 [2022-12-14 12:01:44,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:01:44,056 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2022-12-14 12:01:44,056 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:44,056 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2022-12-14 12:01:44,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 12:01:44,056 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:44,056 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:44,056 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 12:01:44,057 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:44,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:44,057 INFO L85 PathProgramCache]: Analyzing trace with hash 1533723065, now seen corresponding path program 1 times [2022-12-14 12:01:44,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:44,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944135288] [2022-12-14 12:01:44,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:44,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:44,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:44,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 12:01:44,126 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:44,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944135288] [2022-12-14 12:01:44,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944135288] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:01:44,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751532703] [2022-12-14 12:01:44,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:44,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:44,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:01:44,128 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:01:44,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 12:01:44,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:44,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 12:01:44,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:01:44,230 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 12:01:44,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:01:44,247 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 12:01:44,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751532703] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:01:44,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [808957382] [2022-12-14 12:01:44,265 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:01:44,265 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:01:44,269 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:01:44,274 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:01:44,274 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:01:44,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:44,366 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:01:44,367 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:01:44,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:44,390 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 [2022-12-14 12:01:44,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:44,428 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 31 treesize of output 33 [2022-12-14 12:01:44,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:44,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:44,506 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:01:44,506 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:01:44,560 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 16 treesize of output 12 [2022-12-14 12:01:44,703 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:01:44,851 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '220#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:01:44,851 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:01:44,851 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:01:44,851 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-12-14 12:01:44,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062186661] [2022-12-14 12:01:44,852 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:01:44,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 12:01:44,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:01:44,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 12:01:44,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-12-14 12:01:44,854 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:44,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:01:44,882 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2022-12-14 12:01:44,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 12:01:44,883 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 12:01:44,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:01:44,884 INFO L225 Difference]: With dead ends: 27 [2022-12-14 12:01:44,884 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 12:01:44,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-12-14 12:01:44,885 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:01:44,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:01:44,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 12:01:44,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-12-14 12:01:44,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:44,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-12-14 12:01:44,888 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 14 [2022-12-14 12:01:44,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:01:44,888 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-12-14 12:01:44,888 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:44,888 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-12-14 12:01:44,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 12:01:44,889 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:44,889 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:44,895 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 12:01:45,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:45,090 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:45,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:45,091 INFO L85 PathProgramCache]: Analyzing trace with hash 1764319153, now seen corresponding path program 2 times [2022-12-14 12:01:45,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:45,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725064712] [2022-12-14 12:01:45,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:45,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:45,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:45,175 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 12:01:45,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:45,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725064712] [2022-12-14 12:01:45,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1725064712] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:01:45,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688600609] [2022-12-14 12:01:45,176 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:01:45,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:45,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:01:45,178 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:01:45,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 12:01:45,233 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 12:01:45,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:01:45,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 12:01:45,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:01:45,263 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 12:01:45,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:01:45,283 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 12:01:45,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [688600609] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:01:45,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1778721018] [2022-12-14 12:01:45,286 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:01:45,286 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:01:45,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:01:45,286 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:01:45,286 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:01:45,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:45,325 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:01:45,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:01:45,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:45,337 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 [2022-12-14 12:01:45,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:45,361 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 26 treesize of output 28 [2022-12-14 12:01:45,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:45,416 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:01:45,436 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:01:45,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:01:45,533 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 16 treesize of output 12 [2022-12-14 12:01:45,707 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:01:45,905 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '390#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:01:45,905 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:01:45,906 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:01:45,906 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-12-14 12:01:45,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75366187] [2022-12-14 12:01:45,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:01:45,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 12:01:45,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:01:45,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 12:01:45,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-12-14 12:01:45,907 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:45,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:01:45,945 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2022-12-14 12:01:45,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 12:01:45,946 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-12-14 12:01:45,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:01:45,946 INFO L225 Difference]: With dead ends: 29 [2022-12-14 12:01:45,946 INFO L226 Difference]: Without dead ends: 20 [2022-12-14 12:01:45,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-12-14 12:01:45,947 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:01:45,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 7 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:01:45,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-12-14 12:01:45,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-12-14 12:01:45,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:45,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-12-14 12:01:45,952 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 15 [2022-12-14 12:01:45,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:01:45,952 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-12-14 12:01:45,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:45,952 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-12-14 12:01:45,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 12:01:45,953 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:45,953 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:45,958 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-12-14 12:01:46,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:46,154 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:46,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:46,154 INFO L85 PathProgramCache]: Analyzing trace with hash 157211911, now seen corresponding path program 3 times [2022-12-14 12:01:46,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:46,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009035321] [2022-12-14 12:01:46,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:46,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:46,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:47,397 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:01:47,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:47,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009035321] [2022-12-14 12:01:47,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009035321] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:01:47,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162590682] [2022-12-14 12:01:47,398 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:01:47,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:47,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:01:47,399 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:01:47,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 12:01:47,449 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:01:47,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:01:47,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 48 conjunts are in the unsatisfiable core [2022-12-14 12:01:47,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:01:47,476 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 15 treesize of output 11 [2022-12-14 12:01:47,745 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:01:47,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:01:48,148 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 12:01:48,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [162590682] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:01:48,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1896833570] [2022-12-14 12:01:48,151 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:01:48,151 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:01:48,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:01:48,151 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:01:48,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:01:48,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:48,187 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:01:48,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:01:48,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:48,219 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:01:48,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:01:48,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:48,243 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 26 treesize of output 28 [2022-12-14 12:01:48,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:48,286 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:01:48,305 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:01:48,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:01:48,368 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 16 treesize of output 12 [2022-12-14 12:01:48,464 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:01:48,921 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '615#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:01:48,921 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:01:48,922 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:01:48,922 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 14] total 27 [2022-12-14 12:01:48,922 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870287770] [2022-12-14 12:01:48,922 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:01:48,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-12-14 12:01:48,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:01:48,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-12-14 12:01:48,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=904, Unknown=0, NotChecked=0, Total=992 [2022-12-14 12:01:48,924 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:49,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:01:49,166 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2022-12-14 12:01:49,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 12:01:49,167 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-12-14 12:01:49,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:01:49,167 INFO L225 Difference]: With dead ends: 33 [2022-12-14 12:01:49,168 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 12:01:49,168 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 23 SyntacticMatches, 20 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 12:01:49,169 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:01:49,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 37 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:01:49,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 12:01:49,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2022-12-14 12:01:49,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:49,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2022-12-14 12:01:49,175 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 19 [2022-12-14 12:01:49,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:01:49,176 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2022-12-14 12:01:49,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:49,176 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2022-12-14 12:01:49,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 12:01:49,176 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:49,176 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:49,181 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 12:01:49,377 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:49,378 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:49,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:49,379 INFO L85 PathProgramCache]: Analyzing trace with hash 167461184, now seen corresponding path program 4 times [2022-12-14 12:01:49,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:49,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009428406] [2022-12-14 12:01:49,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:49,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:49,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:49,495 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-12-14 12:01:49,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:49,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009428406] [2022-12-14 12:01:49,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009428406] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:01:49,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887827859] [2022-12-14 12:01:49,496 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:01:49,496 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:49,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:01:49,497 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:01:49,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 12:01:49,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:49,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 12:01:49,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:01:49,582 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-12-14 12:01:49,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:01:49,612 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-12-14 12:01:49,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887827859] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:01:49,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [590736036] [2022-12-14 12:01:49,614 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:01:49,615 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:01:49,615 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:01:49,615 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:01:49,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:01:49,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:49,646 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:01:49,647 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:01:49,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:49,655 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 [2022-12-14 12:01:49,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:49,674 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 26 treesize of output 28 [2022-12-14 12:01:49,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:49,714 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:01:49,731 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:01:49,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:01:49,789 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 16 treesize of output 12 [2022-12-14 12:01:49,894 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:01:50,128 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '858#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:01:50,128 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:01:50,128 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:01:50,128 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-12-14 12:01:50,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239649281] [2022-12-14 12:01:50,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:01:50,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 12:01:50,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:01:50,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 12:01:50,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-12-14 12:01:50,129 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:50,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:01:50,196 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2022-12-14 12:01:50,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 12:01:50,197 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-12-14 12:01:50,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:01:50,197 INFO L225 Difference]: With dead ends: 54 [2022-12-14 12:01:50,197 INFO L226 Difference]: Without dead ends: 29 [2022-12-14 12:01:50,198 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 39 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2022-12-14 12:01:50,199 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:01:50,199 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:01:50,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-12-14 12:01:50,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-12-14 12:01:50,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:50,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-12-14 12:01:50,203 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 20 [2022-12-14 12:01:50,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:01:50,203 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-12-14 12:01:50,203 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:50,203 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-12-14 12:01:50,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 12:01:50,203 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:50,203 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:50,208 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 12:01:50,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 12:01:50,405 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:50,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:50,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1030126280, now seen corresponding path program 5 times [2022-12-14 12:01:50,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:50,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178571796] [2022-12-14 12:01:50,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:50,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:50,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:50,501 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 12:01:50,501 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:50,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178571796] [2022-12-14 12:01:50,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178571796] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:01:50,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663824634] [2022-12-14 12:01:50,502 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:01:50,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:50,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:01:50,503 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:01:50,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 12:01:50,559 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 12:01:50,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:01:50,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 12:01:50,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:01:50,610 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 12:01:50,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:01:50,682 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 12:01:50,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663824634] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:01:50,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [929108558] [2022-12-14 12:01:50,684 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:01:50,684 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:01:50,684 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:01:50,685 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:01:50,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:01:50,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:50,718 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:01:50,718 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:01:50,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:50,748 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:01:50,748 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:01:50,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:50,770 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 26 treesize of output 28 [2022-12-14 12:01:50,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:50,809 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:01:50,828 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:01:50,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:01:50,891 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 16 treesize of output 12 [2022-12-14 12:01:50,982 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:01:51,236 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1156#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:01:51,236 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:01:51,236 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:01:51,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-12-14 12:01:51,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152670535] [2022-12-14 12:01:51,236 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:01:51,237 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 12:01:51,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:01:51,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 12:01:51,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2022-12-14 12:01:51,238 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:51,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:01:51,324 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2022-12-14 12:01:51,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 12:01:51,325 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-12-14 12:01:51,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:01:51,325 INFO L225 Difference]: With dead ends: 42 [2022-12-14 12:01:51,325 INFO L226 Difference]: Without dead ends: 25 [2022-12-14 12:01:51,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 41 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2022-12-14 12:01:51,327 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 51 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:01:51,327 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 7 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:01:51,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-12-14 12:01:51,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-12-14 12:01:51,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:51,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2022-12-14 12:01:51,331 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 21 [2022-12-14 12:01:51,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:01:51,331 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2022-12-14 12:01:51,331 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:51,331 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2022-12-14 12:01:51,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 12:01:51,332 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:51,332 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:51,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 12:01:51,532 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:51,534 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:51,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:51,535 INFO L85 PathProgramCache]: Analyzing trace with hash -1582715975, now seen corresponding path program 6 times [2022-12-14 12:01:51,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:51,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207490745] [2022-12-14 12:01:51,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:51,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:51,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:52,753 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:01:52,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:52,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207490745] [2022-12-14 12:01:52,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207490745] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:01:52,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345398365] [2022-12-14 12:01:52,754 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:01:52,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:52,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:01:52,755 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:01:52,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 12:01:52,808 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:01:52,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:01:52,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 12:01:52,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:01:52,836 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 15 treesize of output 11 [2022-12-14 12:01:53,387 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:01:53,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:01:54,042 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 12:01:54,043 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345398365] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:01:54,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1533336031] [2022-12-14 12:01:54,044 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:01:54,044 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:01:54,045 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:01:54,045 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:01:54,045 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:01:54,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:54,073 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:01:54,074 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:01:54,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:54,097 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:01:54,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:01:54,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:54,113 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 26 treesize of output 28 [2022-12-14 12:01:54,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:54,155 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:01:54,172 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:01:54,173 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:01:54,221 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 16 treesize of output 12 [2022-12-14 12:01:54,287 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:01:54,574 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1477#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:01:54,574 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:01:54,574 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:01:54,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 18] total 49 [2022-12-14 12:01:54,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255071376] [2022-12-14 12:01:54,574 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:01:54,575 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 12:01:54,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:01:54,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 12:01:54,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2686, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 12:01:54,578 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:55,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:01:55,504 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2022-12-14 12:01:55,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 12:01:55,505 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-12-14 12:01:55,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:01:55,505 INFO L225 Difference]: With dead ends: 41 [2022-12-14 12:01:55,505 INFO L226 Difference]: Without dead ends: 38 [2022-12-14 12:01:55,506 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 33 SyntacticMatches, 8 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1202 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=251, Invalid=3655, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 12:01:55,507 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 787 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 12:01:55,507 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 61 Invalid, 800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 787 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 12:01:55,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-12-14 12:01:55,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2022-12-14 12:01:55,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:55,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-12-14 12:01:55,513 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 24 [2022-12-14 12:01:55,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:01:55,514 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-12-14 12:01:55,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:55,514 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-12-14 12:01:55,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 12:01:55,514 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:55,515 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:55,519 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 12:01:55,715 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:55,716 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:55,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:55,717 INFO L85 PathProgramCache]: Analyzing trace with hash 914045538, now seen corresponding path program 7 times [2022-12-14 12:01:55,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:55,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986734504] [2022-12-14 12:01:55,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:55,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:55,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:55,836 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 12:01:55,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:55,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986734504] [2022-12-14 12:01:55,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986734504] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:01:55,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315605578] [2022-12-14 12:01:55,836 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:01:55,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:55,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:01:55,837 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:01:55,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 12:01:55,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:55,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 12:01:55,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:01:55,938 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 12:01:55,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:01:55,977 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 12:01:55,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315605578] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:01:55,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368181035] [2022-12-14 12:01:55,980 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:01:55,980 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:01:55,980 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:01:55,980 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:01:55,980 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:01:55,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:56,012 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:01:56,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:01:56,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:56,021 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 [2022-12-14 12:01:56,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:56,038 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 31 treesize of output 33 [2022-12-14 12:01:56,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:56,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:56,086 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:01:56,086 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:01:56,122 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 16 treesize of output 12 [2022-12-14 12:01:56,220 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:01:56,483 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1799#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:01:56,484 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:01:56,484 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:01:56,484 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-12-14 12:01:56,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131794487] [2022-12-14 12:01:56,484 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:01:56,484 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 12:01:56,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:01:56,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 12:01:56,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2022-12-14 12:01:56,485 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:56,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:01:56,572 INFO L93 Difference]: Finished difference Result 68 states and 82 transitions. [2022-12-14 12:01:56,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 12:01:56,572 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-12-14 12:01:56,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:01:56,573 INFO L225 Difference]: With dead ends: 68 [2022-12-14 12:01:56,573 INFO L226 Difference]: Without dead ends: 36 [2022-12-14 12:01:56,573 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 49 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2022-12-14 12:01:56,574 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:01:56,574 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 13 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:01:56,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-12-14 12:01:56,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-12-14 12:01:56,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 35 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:56,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2022-12-14 12:01:56,579 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 25 [2022-12-14 12:01:56,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:01:56,579 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2022-12-14 12:01:56,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:56,580 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2022-12-14 12:01:56,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 12:01:56,580 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:56,580 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:56,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-12-14 12:01:56,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:56,781 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:56,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:56,782 INFO L85 PathProgramCache]: Analyzing trace with hash 746631530, now seen corresponding path program 8 times [2022-12-14 12:01:56,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:56,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298450079] [2022-12-14 12:01:56,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:56,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:56,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:56,894 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 12:01:56,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:56,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298450079] [2022-12-14 12:01:56,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298450079] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:01:56,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876312798] [2022-12-14 12:01:56,895 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:01:56,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:56,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:01:56,896 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:01:56,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 12:01:56,953 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 12:01:56,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:01:56,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 12:01:56,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:01:57,011 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 12:01:57,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:01:57,060 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 12:01:57,060 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1876312798] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:01:57,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [872999020] [2022-12-14 12:01:57,062 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:01:57,062 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:01:57,062 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:01:57,062 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:01:57,062 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:01:57,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:57,093 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:01:57,093 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:01:57,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:57,122 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:01:57,122 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:01:57,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:57,145 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 31 treesize of output 33 [2022-12-14 12:01:57,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:57,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:01:57,189 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:01:57,189 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:01:57,215 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 16 treesize of output 12 [2022-12-14 12:01:57,282 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:01:57,521 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2174#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:01:57,521 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:01:57,521 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:01:57,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-12-14 12:01:57,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130561753] [2022-12-14 12:01:57,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:01:57,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 12:01:57,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:01:57,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 12:01:57,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2022-12-14 12:01:57,523 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:57,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:01:57,615 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2022-12-14 12:01:57,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 12:01:57,615 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-12-14 12:01:57,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:01:57,615 INFO L225 Difference]: With dead ends: 51 [2022-12-14 12:01:57,616 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 12:01:57,616 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 55 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=159, Invalid=543, Unknown=0, NotChecked=0, Total=702 [2022-12-14 12:01:57,617 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 34 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:01:57,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 15 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:01:57,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 12:01:57,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-12-14 12:01:57,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:57,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-12-14 12:01:57,622 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 26 [2022-12-14 12:01:57,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:01:57,623 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-12-14 12:01:57,623 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:01:57,623 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-12-14 12:01:57,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 12:01:57,623 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:01:57,623 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:01:57,628 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 12:01:57,824 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:57,825 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:01:57,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:01:57,826 INFO L85 PathProgramCache]: Analyzing trace with hash -1701461113, now seen corresponding path program 9 times [2022-12-14 12:01:57,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:01:57,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300673368] [2022-12-14 12:01:57,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:01:57,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:01:57,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:01:59,406 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:01:59,407 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:01:59,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300673368] [2022-12-14 12:01:59,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300673368] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:01:59,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [124137323] [2022-12-14 12:01:59,407 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:01:59,407 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:01:59,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:01:59,408 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:01:59,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 12:01:59,463 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:01:59,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:01:59,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 86 conjunts are in the unsatisfiable core [2022-12-14 12:01:59,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:01:59,527 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 15 treesize of output 11 [2022-12-14 12:02:00,420 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:02:00,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:01,624 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:02:01,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [124137323] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:01,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [630834166] [2022-12-14 12:02:01,625 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:01,625 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:01,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:01,625 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:01,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:01,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:01,649 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:02:01,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:02:01,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:01,674 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:01,674 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:01,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:01,691 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 26 treesize of output 28 [2022-12-14 12:02:01,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:01,728 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:02:01,745 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:02:01,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:02:01,799 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 16 treesize of output 12 [2022-12-14 12:02:01,880 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:02,770 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2569#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:02,770 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:02,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:02,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 26, 22] total 63 [2022-12-14 12:02:02,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88273282] [2022-12-14 12:02:02,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:02,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-12-14 12:02:02,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:02,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-12-14 12:02:02,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=4333, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 12:02:02,774 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 63 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 63 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:04,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:04,532 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2022-12-14 12:02:04,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 12:02:04,532 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 63 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-12-14 12:02:04,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:04,533 INFO L225 Difference]: With dead ends: 49 [2022-12-14 12:02:04,533 INFO L226 Difference]: Without dead ends: 46 [2022-12-14 12:02:04,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 29 SyntacticMatches, 18 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2415 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=365, Invalid=6441, Unknown=0, NotChecked=0, Total=6806 [2022-12-14 12:02:04,534 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 1282 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 1303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:04,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 81 Invalid, 1303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 1282 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 12:02:04,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-12-14 12:02:04,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2022-12-14 12:02:04,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:04,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2022-12-14 12:02:04,543 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 29 [2022-12-14 12:02:04,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:04,543 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2022-12-14 12:02:04,543 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 63 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:04,544 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2022-12-14 12:02:04,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 12:02:04,544 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:04,544 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:04,548 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 12:02:04,745 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:04,745 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:04,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:04,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1814674624, now seen corresponding path program 10 times [2022-12-14 12:02:04,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:04,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831657955] [2022-12-14 12:02:04,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:04,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:04,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:04,875 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 12:02:04,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:04,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831657955] [2022-12-14 12:02:04,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831657955] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:04,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072617531] [2022-12-14 12:02:04,875 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:02:04,876 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:04,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:04,876 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:04,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 12:02:04,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:04,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 12:02:04,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:05,014 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 12:02:05,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:05,065 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 12:02:05,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1072617531] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:05,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2105568747] [2022-12-14 12:02:05,066 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:05,067 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:05,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:05,067 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:05,067 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:05,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:05,093 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:05,093 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:05,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:05,100 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 [2022-12-14 12:02:05,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:05,116 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 31 treesize of output 33 [2022-12-14 12:02:05,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:05,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:05,156 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:02:05,156 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:02:05,184 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 16 treesize of output 12 [2022-12-14 12:02:05,248 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:05,454 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2966#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:05,454 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:05,454 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:05,454 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-12-14 12:02:05,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033581922] [2022-12-14 12:02:05,454 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:05,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 12:02:05,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:05,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 12:02:05,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=442, Unknown=0, NotChecked=0, Total=552 [2022-12-14 12:02:05,455 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:05,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:05,589 INFO L93 Difference]: Finished difference Result 82 states and 96 transitions. [2022-12-14 12:02:05,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 12:02:05,590 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-12-14 12:02:05,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:05,590 INFO L225 Difference]: With dead ends: 82 [2022-12-14 12:02:05,590 INFO L226 Difference]: Without dead ends: 43 [2022-12-14 12:02:05,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 64 SyntacticMatches, 14 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=162, Invalid=650, Unknown=0, NotChecked=0, Total=812 [2022-12-14 12:02:05,592 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:05,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 7 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:02:05,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-12-14 12:02:05,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-12-14 12:02:05,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 42 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:05,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2022-12-14 12:02:05,600 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 30 [2022-12-14 12:02:05,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:05,600 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2022-12-14 12:02:05,600 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:05,600 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2022-12-14 12:02:05,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 12:02:05,600 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:05,601 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:05,606 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 12:02:05,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 12:02:05,801 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:05,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:05,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1885508936, now seen corresponding path program 11 times [2022-12-14 12:02:05,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:05,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502011302] [2022-12-14 12:02:05,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:05,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:05,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:06,001 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-12-14 12:02:06,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:06,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502011302] [2022-12-14 12:02:06,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502011302] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:06,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311773686] [2022-12-14 12:02:06,001 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:02:06,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:06,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:06,002 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:06,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 12:02:06,066 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 12:02:06,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:02:06,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 12:02:06,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:06,146 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-12-14 12:02:06,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:06,214 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-12-14 12:02:06,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [311773686] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:06,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2138951727] [2022-12-14 12:02:06,216 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:06,216 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:06,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:06,216 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:06,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:06,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:06,247 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:02:06,247 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:02:06,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:06,276 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:06,277 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:06,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:06,294 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 26 treesize of output 28 [2022-12-14 12:02:06,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:06,333 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:02:06,353 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:02:06,354 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:02:06,415 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 16 treesize of output 12 [2022-12-14 12:02:06,487 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:06,759 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3418#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:06,759 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:06,759 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:06,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-12-14 12:02:06,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17162840] [2022-12-14 12:02:06,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:06,760 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 12:02:06,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:06,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 12:02:06,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2022-12-14 12:02:06,761 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:06,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:06,867 INFO L93 Difference]: Finished difference Result 60 states and 72 transitions. [2022-12-14 12:02:06,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 12:02:06,868 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-12-14 12:02:06,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:06,868 INFO L225 Difference]: With dead ends: 60 [2022-12-14 12:02:06,868 INFO L226 Difference]: Without dead ends: 35 [2022-12-14 12:02:06,868 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 66 SyntacticMatches, 15 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 458 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2022-12-14 12:02:06,869 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 38 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:06,869 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 11 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:02:06,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-12-14 12:02:06,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-12-14 12:02:06,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:06,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2022-12-14 12:02:06,873 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 31 [2022-12-14 12:02:06,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:06,873 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2022-12-14 12:02:06,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:06,874 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2022-12-14 12:02:06,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 12:02:06,874 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:06,874 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:06,878 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 12:02:07,074 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:07,075 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:07,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:07,076 INFO L85 PathProgramCache]: Analyzing trace with hash 1338230201, now seen corresponding path program 12 times [2022-12-14 12:02:07,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:07,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339890345] [2022-12-14 12:02:07,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:07,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:07,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:09,608 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 1 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:02:09,608 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:09,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339890345] [2022-12-14 12:02:09,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339890345] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:09,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1528798650] [2022-12-14 12:02:09,608 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:02:09,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:09,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:09,609 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:09,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 12:02:09,658 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:02:09,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:02:09,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 102 conjunts are in the unsatisfiable core [2022-12-14 12:02:09,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:09,758 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 15 treesize of output 11 [2022-12-14 12:02:10,942 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:02:10,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:12,881 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 12:02:12,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1528798650] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:12,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [298987181] [2022-12-14 12:02:12,883 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:12,883 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:12,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:12,883 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:12,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:12,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:12,915 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:12,916 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:12,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:12,924 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 [2022-12-14 12:02:12,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:12,940 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 26 treesize of output 28 [2022-12-14 12:02:12,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:12,974 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:02:12,993 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:02:12,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:02:13,050 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 16 treesize of output 12 [2022-12-14 12:02:13,136 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:14,283 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3883#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:14,283 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:14,283 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:14,284 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 31, 26] total 73 [2022-12-14 12:02:14,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614585199] [2022-12-14 12:02:14,284 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:14,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-12-14 12:02:14,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:14,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-12-14 12:02:14,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=5754, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 12:02:14,286 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 73 states, 73 states have (on average 1.1506849315068493) internal successors, (84), 73 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:16,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:16,771 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2022-12-14 12:02:16,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 12:02:16,771 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.1506849315068493) internal successors, (84), 73 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-12-14 12:02:16,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:16,772 INFO L225 Difference]: With dead ends: 57 [2022-12-14 12:02:16,772 INFO L226 Difference]: Without dead ends: 54 [2022-12-14 12:02:16,773 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 34 SyntacticMatches, 23 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3004 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=439, Invalid=8681, Unknown=0, NotChecked=0, Total=9120 [2022-12-14 12:02:16,773 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 1673 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 1708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1673 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:16,774 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 93 Invalid, 1708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1673 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 12:02:16,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-12-14 12:02:16,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 49. [2022-12-14 12:02:16,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 48 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:16,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2022-12-14 12:02:16,786 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 34 [2022-12-14 12:02:16,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:16,786 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2022-12-14 12:02:16,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.1506849315068493) internal successors, (84), 73 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:16,786 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2022-12-14 12:02:16,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 12:02:16,787 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:16,787 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:16,791 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 12:02:16,987 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:16,988 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:16,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:16,989 INFO L85 PathProgramCache]: Analyzing trace with hash 177241442, now seen corresponding path program 13 times [2022-12-14 12:02:16,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:16,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450728856] [2022-12-14 12:02:16,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:16,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:17,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:17,097 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 12:02:17,097 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:17,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450728856] [2022-12-14 12:02:17,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1450728856] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:17,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139058146] [2022-12-14 12:02:17,097 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:02:17,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:17,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:17,098 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:17,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 12:02:17,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:17,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 12:02:17,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:17,234 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 12:02:17,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:17,289 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 12:02:17,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139058146] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:17,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944554563] [2022-12-14 12:02:17,290 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:17,290 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:17,291 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:17,291 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:17,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:17,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:17,315 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:02:17,315 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:02:17,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:17,339 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:17,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:17,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:17,358 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 26 treesize of output 28 [2022-12-14 12:02:17,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:17,390 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:02:17,405 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:02:17,405 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:02:17,464 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 16 treesize of output 12 [2022-12-14 12:02:17,533 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:17,891 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4349#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:17,891 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:17,891 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:17,891 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2022-12-14 12:02:17,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995198120] [2022-12-14 12:02:17,891 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:17,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 12:02:17,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:17,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 12:02:17,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2022-12-14 12:02:17,892 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:18,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:18,017 INFO L93 Difference]: Finished difference Result 96 states and 110 transitions. [2022-12-14 12:02:18,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 12:02:18,017 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-12-14 12:02:18,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:18,017 INFO L225 Difference]: With dead ends: 96 [2022-12-14 12:02:18,017 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 12:02:18,018 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 63 SyntacticMatches, 29 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 703 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 12:02:18,018 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:18,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:02:18,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 12:02:18,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-12-14 12:02:18,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:18,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2022-12-14 12:02:18,026 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 35 [2022-12-14 12:02:18,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:18,026 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2022-12-14 12:02:18,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:18,026 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2022-12-14 12:02:18,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 12:02:18,027 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:18,027 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:18,031 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 12:02:18,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 12:02:18,228 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:18,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:18,230 INFO L85 PathProgramCache]: Analyzing trace with hash -191706518, now seen corresponding path program 14 times [2022-12-14 12:02:18,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:18,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477221536] [2022-12-14 12:02:18,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:18,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:18,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:18,365 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 12:02:18,365 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:18,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477221536] [2022-12-14 12:02:18,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477221536] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:18,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886503694] [2022-12-14 12:02:18,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:02:18,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:18,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:18,367 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:18,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 12:02:18,459 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 12:02:18,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:02:18,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 12:02:18,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:18,522 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 12:02:18,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:18,588 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 12:02:18,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886503694] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:18,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [111224759] [2022-12-14 12:02:18,589 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:18,589 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:18,589 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:18,589 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:18,589 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:18,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:18,612 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:02:18,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:02:18,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:18,636 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:18,637 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:18,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:18,655 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 26 treesize of output 28 [2022-12-14 12:02:18,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:18,691 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:02:18,710 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:02:18,711 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:02:18,774 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 16 treesize of output 12 [2022-12-14 12:02:18,858 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:19,128 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4878#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:19,128 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:19,128 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:19,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-12-14 12:02:19,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665832868] [2022-12-14 12:02:19,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:19,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 12:02:19,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:19,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 12:02:19,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2022-12-14 12:02:19,130 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:19,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:19,249 INFO L93 Difference]: Finished difference Result 69 states and 81 transitions. [2022-12-14 12:02:19,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 12:02:19,250 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-12-14 12:02:19,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:19,250 INFO L225 Difference]: With dead ends: 69 [2022-12-14 12:02:19,250 INFO L226 Difference]: Without dead ends: 40 [2022-12-14 12:02:19,251 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 71 SyntacticMatches, 24 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 12:02:19,252 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 155 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:19,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 11 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:02:19,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-12-14 12:02:19,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-12-14 12:02:19,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:19,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2022-12-14 12:02:19,259 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 36 [2022-12-14 12:02:19,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:19,259 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2022-12-14 12:02:19,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:19,259 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2022-12-14 12:02:19,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 12:02:19,260 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:19,260 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:19,264 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 12:02:19,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 12:02:19,461 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:19,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:19,462 INFO L85 PathProgramCache]: Analyzing trace with hash -1452099065, now seen corresponding path program 15 times [2022-12-14 12:02:19,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:19,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859941248] [2022-12-14 12:02:19,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:19,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:19,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:22,972 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:02:22,972 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:22,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859941248] [2022-12-14 12:02:22,973 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859941248] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:22,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866164752] [2022-12-14 12:02:22,973 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:02:22,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:22,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:22,974 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:22,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 12:02:23,039 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:02:23,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:02:23,041 WARN L261 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 122 conjunts are in the unsatisfiable core [2022-12-14 12:02:23,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:23,129 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 13 treesize of output 9 [2022-12-14 12:02:24,834 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:02:24,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:27,697 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 12:02:27,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [866164752] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:27,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [572229730] [2022-12-14 12:02:27,698 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:27,698 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:27,699 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:27,699 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:27,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:27,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:27,722 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:02:27,722 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:02:27,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:27,744 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:27,744 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:27,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:27,761 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 26 treesize of output 28 [2022-12-14 12:02:27,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:27,790 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:02:27,808 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:02:27,808 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:02:27,858 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 16 treesize of output 12 [2022-12-14 12:02:27,924 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:28,975 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5414#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:28,975 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:28,975 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:28,975 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 36, 30] total 84 [2022-12-14 12:02:28,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348418533] [2022-12-14 12:02:28,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:28,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-12-14 12:02:28,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:28,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-12-14 12:02:28,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=7545, Unknown=0, NotChecked=0, Total=7832 [2022-12-14 12:02:28,978 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 84 states, 84 states have (on average 1.130952380952381) internal successors, (95), 84 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:33,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:33,025 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2022-12-14 12:02:33,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 12:02:33,025 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.130952380952381) internal successors, (95), 84 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-12-14 12:02:33,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:33,026 INFO L225 Difference]: With dead ends: 65 [2022-12-14 12:02:33,026 INFO L226 Difference]: Without dead ends: 62 [2022-12-14 12:02:33,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 46 SyntacticMatches, 20 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3259 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=520, Invalid=11470, Unknown=0, NotChecked=0, Total=11990 [2022-12-14 12:02:33,029 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 2081 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 2139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 2081 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:33,030 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 101 Invalid, 2139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 2081 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 12:02:33,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-12-14 12:02:33,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 56. [2022-12-14 12:02:33,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 55 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:33,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2022-12-14 12:02:33,041 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 39 [2022-12-14 12:02:33,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:33,041 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2022-12-14 12:02:33,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.130952380952381) internal successors, (95), 84 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:33,041 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2022-12-14 12:02:33,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 12:02:33,041 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:33,042 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:33,047 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 12:02:33,242 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:33,243 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:33,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:33,244 INFO L85 PathProgramCache]: Analyzing trace with hash -1357133760, now seen corresponding path program 16 times [2022-12-14 12:02:33,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:33,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941491885] [2022-12-14 12:02:33,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:33,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:33,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:33,386 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-12-14 12:02:33,386 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:33,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941491885] [2022-12-14 12:02:33,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941491885] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:33,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1481506925] [2022-12-14 12:02:33,387 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:02:33,387 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:33,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:33,388 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:33,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 12:02:33,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:33,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 12:02:33,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:33,517 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-12-14 12:02:33,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:33,573 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-12-14 12:02:33,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1481506925] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:33,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [566305382] [2022-12-14 12:02:33,574 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:33,574 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:33,574 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:33,574 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:33,574 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:33,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:33,599 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:02:33,599 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:02:33,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:33,623 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:33,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:33,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:33,643 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 26 treesize of output 28 [2022-12-14 12:02:33,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:33,676 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:02:33,690 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:02:33,691 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:02:33,749 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 16 treesize of output 12 [2022-12-14 12:02:33,821 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:34,367 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5949#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:34,367 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:34,367 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:34,367 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-12-14 12:02:34,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033876772] [2022-12-14 12:02:34,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:34,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 12:02:34,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:34,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 12:02:34,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=696, Unknown=0, NotChecked=0, Total=870 [2022-12-14 12:02:34,369 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:34,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:34,548 INFO L93 Difference]: Finished difference Result 110 states and 124 transitions. [2022-12-14 12:02:34,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 12:02:34,549 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-12-14 12:02:34,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:34,549 INFO L225 Difference]: With dead ends: 110 [2022-12-14 12:02:34,549 INFO L226 Difference]: Without dead ends: 57 [2022-12-14 12:02:34,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 79 SyntacticMatches, 27 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 773 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=267, Invalid=1065, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 12:02:34,550 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:34,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 11 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:02:34,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-12-14 12:02:34,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-12-14 12:02:34,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:34,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2022-12-14 12:02:34,560 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 40 [2022-12-14 12:02:34,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:34,560 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2022-12-14 12:02:34,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:34,560 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2022-12-14 12:02:34,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 12:02:34,561 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:34,561 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:34,565 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 12:02:34,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 12:02:34,762 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:34,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:34,763 INFO L85 PathProgramCache]: Analyzing trace with hash 690511928, now seen corresponding path program 17 times [2022-12-14 12:02:34,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:34,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643897055] [2022-12-14 12:02:34,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:34,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:34,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:34,912 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 12:02:34,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:34,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643897055] [2022-12-14 12:02:34,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643897055] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:34,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730645918] [2022-12-14 12:02:34,912 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:02:34,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:34,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:34,913 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:34,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 12:02:35,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 12:02:35,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:02:35,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 12:02:35,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:35,117 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 12:02:35,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:35,219 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 12:02:35,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730645918] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:35,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [340150892] [2022-12-14 12:02:35,221 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:35,221 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:35,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:35,221 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:35,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:35,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:35,252 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:02:35,253 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:02:35,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:35,281 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:35,282 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:35,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:35,301 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 31 treesize of output 33 [2022-12-14 12:02:35,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:35,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:35,346 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:02:35,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:02:35,378 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 16 treesize of output 12 [2022-12-14 12:02:35,451 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:35,891 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6555#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:35,891 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:35,891 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:35,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-12-14 12:02:35,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642665938] [2022-12-14 12:02:35,892 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:35,892 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 12:02:35,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:35,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 12:02:35,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2022-12-14 12:02:35,893 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:36,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:36,068 INFO L93 Difference]: Finished difference Result 78 states and 90 transitions. [2022-12-14 12:02:36,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 12:02:36,068 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-12-14 12:02:36,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:36,069 INFO L225 Difference]: With dead ends: 78 [2022-12-14 12:02:36,069 INFO L226 Difference]: Without dead ends: 45 [2022-12-14 12:02:36,069 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 81 SyntacticMatches, 28 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1024 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=348, Invalid=1134, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 12:02:36,070 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 83 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:36,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 13 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:02:36,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-12-14 12:02:36,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-12-14 12:02:36,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:36,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2022-12-14 12:02:36,078 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 41 [2022-12-14 12:02:36,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:36,078 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2022-12-14 12:02:36,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:36,078 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2022-12-14 12:02:36,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 12:02:36,078 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:36,078 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:36,082 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 12:02:36,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:36,280 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:36,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:36,281 INFO L85 PathProgramCache]: Analyzing trace with hash -1551560775, now seen corresponding path program 18 times [2022-12-14 12:02:36,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:36,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796560394] [2022-12-14 12:02:36,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:36,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:36,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:40,518 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:02:40,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:40,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796560394] [2022-12-14 12:02:40,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796560394] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:40,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [595927867] [2022-12-14 12:02:40,519 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:02:40,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:40,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:40,520 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:40,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 12:02:40,583 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:02:40,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:02:40,586 WARN L261 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 138 conjunts are in the unsatisfiable core [2022-12-14 12:02:40,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:40,643 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 15 treesize of output 11 [2022-12-14 12:02:42,408 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:02:42,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:46,499 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 12:02:46,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [595927867] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:46,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [203152925] [2022-12-14 12:02:46,500 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:46,500 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:46,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:46,501 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:46,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:46,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:46,534 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:46,535 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:46,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:46,543 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 [2022-12-14 12:02:46,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:46,561 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 31 treesize of output 33 [2022-12-14 12:02:46,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:46,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:46,606 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:02:46,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:02:46,641 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 16 treesize of output 12 [2022-12-14 12:02:46,713 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:49,678 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7156#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:49,678 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:49,679 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:49,679 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 41, 34] total 89 [2022-12-14 12:02:49,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152651729] [2022-12-14 12:02:49,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:49,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-12-14 12:02:49,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:49,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-12-14 12:02:49,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=8401, Unknown=0, NotChecked=0, Total=8742 [2022-12-14 12:02:49,680 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 89 states, 89 states have (on average 1.101123595505618) internal successors, (98), 89 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:54,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:54,375 INFO L93 Difference]: Finished difference Result 73 states and 80 transitions. [2022-12-14 12:02:54,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 12:02:54,375 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.101123595505618) internal successors, (98), 89 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-12-14 12:02:54,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:54,376 INFO L225 Difference]: With dead ends: 73 [2022-12-14 12:02:54,376 INFO L226 Difference]: Without dead ends: 70 [2022-12-14 12:02:54,377 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 39 SyntacticMatches, 42 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4857 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=615, Invalid=12957, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 12:02:54,377 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 2768 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 2804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 2768 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:54,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 119 Invalid, 2804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 2768 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 12:02:54,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-12-14 12:02:54,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 63. [2022-12-14 12:02:54,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1290322580645162) internal successors, (70), 62 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:54,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2022-12-14 12:02:54,392 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 44 [2022-12-14 12:02:54,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:54,392 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2022-12-14 12:02:54,392 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.101123595505618) internal successors, (98), 89 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:54,392 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2022-12-14 12:02:54,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-12-14 12:02:54,392 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:54,392 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:54,397 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 12:02:54,593 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:54,594 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:54,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:54,594 INFO L85 PathProgramCache]: Analyzing trace with hash 1730244706, now seen corresponding path program 19 times [2022-12-14 12:02:54,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:54,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844026916] [2022-12-14 12:02:54,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:54,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:54,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:54,774 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-12-14 12:02:54,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:54,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844026916] [2022-12-14 12:02:54,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844026916] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:54,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272661918] [2022-12-14 12:02:54,774 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:02:54,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:54,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:54,775 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:54,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 12:02:54,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:54,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 12:02:54,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:54,930 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-12-14 12:02:54,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:55,006 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-12-14 12:02:55,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272661918] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:55,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1842526401] [2022-12-14 12:02:55,008 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:55,008 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:55,008 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:55,008 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:55,008 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:55,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:55,032 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:55,032 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:55,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:55,039 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 [2022-12-14 12:02:55,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:55,054 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 31 treesize of output 33 [2022-12-14 12:02:55,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:55,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:55,094 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:02:55,094 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:02:55,119 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 16 treesize of output 12 [2022-12-14 12:02:55,185 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:55,641 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7758#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:55,641 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:55,641 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:55,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-12-14 12:02:55,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724607153] [2022-12-14 12:02:55,641 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:55,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 12:02:55,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:55,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 12:02:55,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=844, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 12:02:55,642 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:55,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:55,823 INFO L93 Difference]: Finished difference Result 124 states and 138 transitions. [2022-12-14 12:02:55,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 12:02:55,823 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2022-12-14 12:02:55,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:55,824 INFO L225 Difference]: With dead ends: 124 [2022-12-14 12:02:55,824 INFO L226 Difference]: Without dead ends: 64 [2022-12-14 12:02:55,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 81 SyntacticMatches, 39 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=330, Invalid=1310, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 12:02:55,825 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:55,825 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 19 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:02:55,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-12-14 12:02:55,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2022-12-14 12:02:55,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.126984126984127) internal successors, (71), 63 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:55,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2022-12-14 12:02:55,838 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 45 [2022-12-14 12:02:55,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:55,838 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2022-12-14 12:02:55,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:55,839 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2022-12-14 12:02:55,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-12-14 12:02:55,839 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:55,839 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:55,843 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 12:02:56,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-12-14 12:02:56,041 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:56,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:56,042 INFO L85 PathProgramCache]: Analyzing trace with hash -1483926678, now seen corresponding path program 20 times [2022-12-14 12:02:56,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:56,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460609590] [2022-12-14 12:02:56,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:56,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:56,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:02:56,225 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-12-14 12:02:56,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:02:56,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460609590] [2022-12-14 12:02:56,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460609590] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:02:56,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742431299] [2022-12-14 12:02:56,225 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:02:56,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:56,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:02:56,226 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:02:56,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 12:02:56,363 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 12:02:56,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:02:56,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 12:02:56,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:02:56,459 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-12-14 12:02:56,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:02:56,557 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-12-14 12:02:56,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742431299] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:02:56,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1104942043] [2022-12-14 12:02:56,559 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:02:56,559 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:02:56,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:02:56,559 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:02:56,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:02:56,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:56,583 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:02:56,583 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:02:56,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:56,590 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 [2022-12-14 12:02:56,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:56,603 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 31 treesize of output 33 [2022-12-14 12:02:56,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:56,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:02:56,643 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:02:56,643 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:02:56,670 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 16 treesize of output 12 [2022-12-14 12:02:56,735 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:02:57,039 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8441#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:02:57,040 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:02:57,040 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:02:57,040 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-12-14 12:02:57,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182900192] [2022-12-14 12:02:57,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:02:57,040 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 12:02:57,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:02:57,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 12:02:57,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 12:02:57,041 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:57,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:02:57,203 INFO L93 Difference]: Finished difference Result 87 states and 99 transitions. [2022-12-14 12:02:57,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 12:02:57,204 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2022-12-14 12:02:57,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:02:57,204 INFO L225 Difference]: With dead ends: 87 [2022-12-14 12:02:57,204 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 12:02:57,205 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 91 SyntacticMatches, 32 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1304 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=429, Invalid=1377, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 12:02:57,205 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 97 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:02:57,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 7 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:02:57,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 12:02:57,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-12-14 12:02:57,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 49 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:57,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2022-12-14 12:02:57,217 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 46 [2022-12-14 12:02:57,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:02:57,217 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2022-12-14 12:02:57,217 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:02:57,217 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2022-12-14 12:02:57,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-12-14 12:02:57,218 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:02:57,218 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:02:57,222 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 12:02:57,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:02:57,419 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:02:57,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:02:57,420 INFO L85 PathProgramCache]: Analyzing trace with hash -762724217, now seen corresponding path program 21 times [2022-12-14 12:02:57,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:02:57,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597378010] [2022-12-14 12:02:57,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:02:57,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:02:57,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:03:02,836 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:03:02,837 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:03:02,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597378010] [2022-12-14 12:03:02,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597378010] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:03:02,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523497943] [2022-12-14 12:03:02,837 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:03:02,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:03:02,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:03:02,838 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:03:02,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 12:03:02,905 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:03:02,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:03:02,908 WARN L261 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 158 conjunts are in the unsatisfiable core [2022-12-14 12:03:02,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:03:02,960 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 15 treesize of output 11 [2022-12-14 12:03:04,993 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:03:04,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:03:09,825 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 12:03:09,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523497943] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:03:09,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [366603146] [2022-12-14 12:03:09,826 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:03:09,826 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:03:09,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:03:09,827 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:03:09,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:03:09,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:09,852 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:03:09,852 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:03:09,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:09,875 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:03:09,875 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:03:09,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:09,890 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 26 treesize of output 28 [2022-12-14 12:03:09,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:09,922 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:03:09,939 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:03:09,939 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:03:09,992 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 16 treesize of output 12 [2022-12-14 12:03:10,066 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:03:12,348 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9113#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:03:12,348 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:03:12,348 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:03:12,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 46, 38] total 100 [2022-12-14 12:03:12,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458334864] [2022-12-14 12:03:12,348 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:03:12,348 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-12-14 12:03:12,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:03:12,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-12-14 12:03:12,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=10504, Unknown=0, NotChecked=0, Total=10920 [2022-12-14 12:03:12,349 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 100 states, 100 states have (on average 1.09) internal successors, (109), 100 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:18,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:03:18,022 INFO L93 Difference]: Finished difference Result 81 states and 88 transitions. [2022-12-14 12:03:18,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-12-14 12:03:18,022 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.09) internal successors, (109), 100 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2022-12-14 12:03:18,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:03:18,023 INFO L225 Difference]: With dead ends: 81 [2022-12-14 12:03:18,023 INFO L226 Difference]: Without dead ends: 78 [2022-12-14 12:03:18,024 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 51 SyntacticMatches, 39 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5575 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=750, Invalid=16280, Unknown=0, NotChecked=0, Total=17030 [2022-12-14 12:03:18,024 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 3188 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 3212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 3188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:03:18,025 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 129 Invalid, 3212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 3188 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-12-14 12:03:18,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-12-14 12:03:18,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 70. [2022-12-14 12:03:18,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:18,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2022-12-14 12:03:18,053 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 49 [2022-12-14 12:03:18,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:03:18,053 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2022-12-14 12:03:18,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 1.09) internal successors, (109), 100 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:18,053 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2022-12-14 12:03:18,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 12:03:18,054 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:03:18,054 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:03:18,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-12-14 12:03:18,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 12:03:18,255 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:03:18,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:03:18,256 INFO L85 PathProgramCache]: Analyzing trace with hash 415589312, now seen corresponding path program 22 times [2022-12-14 12:03:18,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:03:18,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318835651] [2022-12-14 12:03:18,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:03:18,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:03:18,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:03:18,475 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-12-14 12:03:18,475 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:03:18,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318835651] [2022-12-14 12:03:18,475 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [318835651] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:03:18,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51732671] [2022-12-14 12:03:18,476 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:03:18,476 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:03:18,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:03:18,476 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:03:18,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 12:03:18,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:03:18,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 12:03:18,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:03:18,674 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-12-14 12:03:18,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:03:18,777 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-12-14 12:03:18,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51732671] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:03:18,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [230307014] [2022-12-14 12:03:18,778 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:03:18,778 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:03:18,778 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:03:18,778 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:03:18,778 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:03:18,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:18,804 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:03:18,804 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:03:18,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:18,811 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 [2022-12-14 12:03:18,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:18,825 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 26 treesize of output 28 [2022-12-14 12:03:18,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:18,858 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:03:18,872 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:03:18,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:03:18,928 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 16 treesize of output 12 [2022-12-14 12:03:19,009 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:03:19,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9784#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:03:19,568 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:03:19,568 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:03:19,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-12-14 12:03:19,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278463492] [2022-12-14 12:03:19,568 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:03:19,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-12-14 12:03:19,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:03:19,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-12-14 12:03:19,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1006, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 12:03:19,569 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:19,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:03:19,801 INFO L93 Difference]: Finished difference Result 138 states and 152 transitions. [2022-12-14 12:03:19,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 12:03:19,801 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-12-14 12:03:19,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:03:19,802 INFO L225 Difference]: With dead ends: 138 [2022-12-14 12:03:19,802 INFO L226 Difference]: Without dead ends: 71 [2022-12-14 12:03:19,802 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 99 SyntacticMatches, 35 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=400, Invalid=1580, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 12:03:19,802 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:03:19,802 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 17 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 295 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:03:19,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-12-14 12:03:19,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-12-14 12:03:19,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.1142857142857143) internal successors, (78), 70 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:19,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 78 transitions. [2022-12-14 12:03:19,819 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 78 transitions. Word has length 50 [2022-12-14 12:03:19,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:03:19,819 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 78 transitions. [2022-12-14 12:03:19,819 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:19,819 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 78 transitions. [2022-12-14 12:03:19,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-12-14 12:03:19,820 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:03:19,820 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:03:19,824 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 12:03:20,020 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:03:20,021 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:03:20,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:03:20,022 INFO L85 PathProgramCache]: Analyzing trace with hash -1764858440, now seen corresponding path program 23 times [2022-12-14 12:03:20,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:03:20,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113648465] [2022-12-14 12:03:20,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:03:20,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:03:20,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:03:20,211 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-12-14 12:03:20,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:03:20,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113648465] [2022-12-14 12:03:20,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113648465] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:03:20,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354792501] [2022-12-14 12:03:20,212 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:03:20,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:03:20,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:03:20,212 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:03:20,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 12:03:20,330 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 12:03:20,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:03:20,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 12:03:20,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:03:20,526 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-12-14 12:03:20,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:03:20,702 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-12-14 12:03:20,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354792501] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:03:20,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60399221] [2022-12-14 12:03:20,703 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:03:20,703 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:03:20,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:03:20,704 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:03:20,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:03:20,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:20,731 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:03:20,731 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:03:20,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:20,760 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:03:20,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:03:20,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:20,779 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 31 treesize of output 33 [2022-12-14 12:03:20,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:20,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:20,825 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:03:20,826 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:03:20,860 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 16 treesize of output 12 [2022-12-14 12:03:20,944 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:03:21,369 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10552#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:03:21,369 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:03:21,369 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:03:21,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2022-12-14 12:03:21,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989686751] [2022-12-14 12:03:21,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:03:21,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 12:03:21,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:03:21,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 12:03:21,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1672, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 12:03:21,370 INFO L87 Difference]: Start difference. First operand 71 states and 78 transitions. Second operand has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:21,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:03:21,676 INFO L93 Difference]: Finished difference Result 96 states and 108 transitions. [2022-12-14 12:03:21,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 12:03:21,676 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-12-14 12:03:21,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:03:21,677 INFO L225 Difference]: With dead ends: 96 [2022-12-14 12:03:21,677 INFO L226 Difference]: Without dead ends: 55 [2022-12-14 12:03:21,677 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 93 SyntacticMatches, 36 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2294 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=585, Invalid=2495, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 12:03:21,678 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 155 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:03:21,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 7 Invalid, 526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:03:21,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-12-14 12:03:21,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-12-14 12:03:21,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 54 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:21,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2022-12-14 12:03:21,692 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 51 [2022-12-14 12:03:21,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:03:21,692 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2022-12-14 12:03:21,692 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:21,692 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2022-12-14 12:03:21,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-12-14 12:03:21,693 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:03:21,693 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:03:21,699 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 12:03:21,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:03:21,894 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:03:21,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:03:21,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1538886073, now seen corresponding path program 24 times [2022-12-14 12:03:21,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:03:21,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313066504] [2022-12-14 12:03:21,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:03:21,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:03:22,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:03:27,414 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 10 proven. 215 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:03:27,414 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:03:27,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313066504] [2022-12-14 12:03:27,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313066504] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:03:27,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669432949] [2022-12-14 12:03:27,414 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:03:27,414 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:03:27,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:03:27,415 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:03:27,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 12:03:27,509 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:03:27,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:03:27,512 WARN L261 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 174 conjunts are in the unsatisfiable core [2022-12-14 12:03:27,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:03:27,768 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 15 treesize of output 11 [2022-12-14 12:03:30,705 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:03:30,707 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:03:30,707 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 35 treesize of output 14 [2022-12-14 12:03:30,808 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:03:30,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:03:37,607 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 12:03:37,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669432949] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:03:37,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [387184990] [2022-12-14 12:03:37,608 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:03:37,608 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:03:37,608 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:03:37,608 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:03:37,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:03:37,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:37,632 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:03:37,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:03:37,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:37,655 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:03:37,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:03:37,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:37,671 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 31 treesize of output 33 [2022-12-14 12:03:37,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:37,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:37,713 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:03:37,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:03:37,738 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 16 treesize of output 12 [2022-12-14 12:03:37,800 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:03:40,543 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11305#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:03:40,543 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:03:40,543 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:03:40,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 51, 42] total 119 [2022-12-14 12:03:40,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640807155] [2022-12-14 12:03:40,544 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:03:40,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-12-14 12:03:40,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:03:40,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-12-14 12:03:40,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=14771, Unknown=0, NotChecked=0, Total=15252 [2022-12-14 12:03:40,545 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 119 states, 119 states have (on average 1.0924369747899159) internal successors, (130), 119 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:48,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:03:48,770 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2022-12-14 12:03:48,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-12-14 12:03:48,771 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.0924369747899159) internal successors, (130), 119 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2022-12-14 12:03:48,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:03:48,771 INFO L225 Difference]: With dead ends: 89 [2022-12-14 12:03:48,771 INFO L226 Difference]: Without dead ends: 86 [2022-12-14 12:03:48,772 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 56 SyntacticMatches, 35 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8555 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=910, Invalid=22652, Unknown=0, NotChecked=0, Total=23562 [2022-12-14 12:03:48,772 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 3959 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 4028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 3959 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:03:48,773 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 143 Invalid, 4028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 3959 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-12-14 12:03:48,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-12-14 12:03:48,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2022-12-14 12:03:48,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.105263157894737) internal successors, (84), 76 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:48,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 84 transitions. [2022-12-14 12:03:48,793 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 84 transitions. Word has length 54 [2022-12-14 12:03:48,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:03:48,793 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 84 transitions. [2022-12-14 12:03:48,794 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.0924369747899159) internal successors, (130), 119 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:48,794 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 84 transitions. [2022-12-14 12:03:48,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-12-14 12:03:48,794 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:03:48,794 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:03:48,800 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 12:03:48,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 12:03:48,995 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:03:48,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:03:48,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1684401310, now seen corresponding path program 25 times [2022-12-14 12:03:48,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:03:48,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522750730] [2022-12-14 12:03:48,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:03:48,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:03:49,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:03:49,203 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-12-14 12:03:49,204 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:03:49,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522750730] [2022-12-14 12:03:49,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522750730] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:03:49,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643395519] [2022-12-14 12:03:49,204 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:03:49,204 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:03:49,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:03:49,205 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:03:49,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 12:03:49,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:03:49,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 12:03:49,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:03:49,400 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-12-14 12:03:49,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:03:49,523 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-12-14 12:03:49,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643395519] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:03:49,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1175331878] [2022-12-14 12:03:49,524 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:03:49,524 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:03:49,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:03:49,524 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:03:49,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:03:49,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:49,554 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:03:49,554 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:03:49,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:49,578 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:03:49,578 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:03:49,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:49,593 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 26 treesize of output 28 [2022-12-14 12:03:49,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:49,624 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:03:49,639 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:03:49,640 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:03:49,688 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 16 treesize of output 12 [2022-12-14 12:03:49,760 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:03:50,381 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12047#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:03:50,381 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:03:50,381 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:03:50,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2022-12-14 12:03:50,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806008473] [2022-12-14 12:03:50,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:03:50,382 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 12:03:50,382 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:03:50,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 12:03:50,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=1182, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 12:03:50,382 INFO L87 Difference]: Start difference. First operand 77 states and 84 transitions. Second operand has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:50,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:03:50,657 INFO L93 Difference]: Finished difference Result 152 states and 166 transitions. [2022-12-14 12:03:50,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 12:03:50,657 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2022-12-14 12:03:50,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:03:50,658 INFO L225 Difference]: With dead ends: 152 [2022-12-14 12:03:50,658 INFO L226 Difference]: Without dead ends: 78 [2022-12-14 12:03:50,658 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 109 SyntacticMatches, 39 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1469 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=477, Invalid=1875, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 12:03:50,658 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:03:50,659 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:03:50,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-12-14 12:03:50,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2022-12-14 12:03:50,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.103896103896104) internal successors, (85), 77 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:50,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 85 transitions. [2022-12-14 12:03:50,679 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 85 transitions. Word has length 55 [2022-12-14 12:03:50,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:03:50,679 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 85 transitions. [2022-12-14 12:03:50,679 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:50,679 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 85 transitions. [2022-12-14 12:03:50,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-12-14 12:03:50,679 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:03:50,680 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:03:50,684 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 12:03:50,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 12:03:50,881 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:03:50,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:03:50,882 INFO L85 PathProgramCache]: Analyzing trace with hash -683963286, now seen corresponding path program 26 times [2022-12-14 12:03:50,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:03:50,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189756219] [2022-12-14 12:03:50,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:03:50,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:03:50,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:03:51,148 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-12-14 12:03:51,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:03:51,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189756219] [2022-12-14 12:03:51,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189756219] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:03:51,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034540541] [2022-12-14 12:03:51,148 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:03:51,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:03:51,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:03:51,149 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:03:51,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 12:03:51,322 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 12:03:51,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:03:51,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 12:03:51,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:03:51,631 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-12-14 12:03:51,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:03:51,841 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-12-14 12:03:51,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034540541] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:03:51,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1219586279] [2022-12-14 12:03:51,842 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:03:51,842 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:03:51,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:03:51,842 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:03:51,842 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:03:51,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:51,864 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:03:51,864 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:03:51,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:51,885 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:03:51,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:03:51,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:51,901 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 26 treesize of output 28 [2022-12-14 12:03:51,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:03:51,930 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:03:51,942 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:03:51,943 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:03:51,986 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 16 treesize of output 12 [2022-12-14 12:03:52,048 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:03:52,420 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12893#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:03:52,420 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:03:52,420 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:03:52,420 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2022-12-14 12:03:52,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897578663] [2022-12-14 12:03:52,421 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:03:52,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 12:03:52,421 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:03:52,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 12:03:52,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1988, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 12:03:52,421 INFO L87 Difference]: Start difference. First operand 78 states and 85 transitions. Second operand has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:52,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:03:52,684 INFO L93 Difference]: Finished difference Result 105 states and 117 transitions. [2022-12-14 12:03:52,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 12:03:52,684 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-12-14 12:03:52,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:03:52,685 INFO L225 Difference]: With dead ends: 105 [2022-12-14 12:03:52,685 INFO L226 Difference]: Without dead ends: 60 [2022-12-14 12:03:52,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 112 SyntacticMatches, 30 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2321 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=696, Invalid=2964, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 12:03:52,685 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 113 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 690 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:03:52,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 17 Invalid, 690 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 562 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:03:52,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-12-14 12:03:52,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-12-14 12:03:52,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 59 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:52,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2022-12-14 12:03:52,706 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2022-12-14 12:03:52,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:03:52,706 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2022-12-14 12:03:52,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:03:52,706 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2022-12-14 12:03:52,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-12-14 12:03:52,706 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:03:52,706 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:03:52,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-12-14 12:03:52,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:03:52,908 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:03:52,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:03:52,908 INFO L85 PathProgramCache]: Analyzing trace with hash 1634653959, now seen corresponding path program 27 times [2022-12-14 12:03:52,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:03:52,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31891180] [2022-12-14 12:03:52,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:03:52,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:03:53,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:04:00,043 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 15 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:04:00,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:04:00,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31891180] [2022-12-14 12:04:00,043 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31891180] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:04:00,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809657630] [2022-12-14 12:04:00,043 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:04:00,044 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:04:00,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:04:00,044 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:04:00,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 12:04:00,124 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:04:00,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:04:00,128 WARN L261 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 194 conjunts are in the unsatisfiable core [2022-12-14 12:04:00,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:04:00,499 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 15 treesize of output 11 [2022-12-14 12:04:04,539 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:04:04,541 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:04:04,541 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 35 treesize of output 14 [2022-12-14 12:04:04,654 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:04:04,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:04:14,263 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 12:04:14,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1809657630] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:04:14,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1172453941] [2022-12-14 12:04:14,264 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:04:14,264 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:04:14,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:04:14,265 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:04:14,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:04:14,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:14,295 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:04:14,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:04:14,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:14,325 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:04:14,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:04:14,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:14,346 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 26 treesize of output 28 [2022-12-14 12:04:14,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:14,386 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:04:14,406 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:04:14,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:04:14,462 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 16 treesize of output 12 [2022-12-14 12:04:14,536 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:04:18,919 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13720#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:04:18,919 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:04:18,919 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:04:18,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 56, 46] total 133 [2022-12-14 12:04:18,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404780461] [2022-12-14 12:04:18,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:04:18,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-12-14 12:04:18,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:04:18,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-12-14 12:04:18,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=612, Invalid=18294, Unknown=0, NotChecked=0, Total=18906 [2022-12-14 12:04:18,922 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 133 states, 133 states have (on average 1.0827067669172932) internal successors, (144), 133 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:04:28,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:04:28,776 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2022-12-14 12:04:28,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-12-14 12:04:28,776 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 1.0827067669172932) internal successors, (144), 133 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-12-14 12:04:28,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:04:28,777 INFO L225 Difference]: With dead ends: 97 [2022-12-14 12:04:28,777 INFO L226 Difference]: Without dead ends: 94 [2022-12-14 12:04:28,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 60 SyntacticMatches, 37 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10649 ImplicationChecksByTransitivity, 26.3s TimeCoverageRelationStatistics Valid=1121, Invalid=27949, Unknown=0, NotChecked=0, Total=29070 [2022-12-14 12:04:28,778 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 4674 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 4726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 4674 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-12-14 12:04:28,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 153 Invalid, 4726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 4674 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-12-14 12:04:28,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-12-14 12:04:28,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2022-12-14 12:04:28,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 83 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:04:28,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 91 transitions. [2022-12-14 12:04:28,817 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 91 transitions. Word has length 59 [2022-12-14 12:04:28,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:04:28,817 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 91 transitions. [2022-12-14 12:04:28,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 1.0827067669172932) internal successors, (144), 133 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:04:28,818 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 91 transitions. [2022-12-14 12:04:28,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-12-14 12:04:28,818 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:04:28,818 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:04:28,822 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-12-14 12:04:29,018 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 12:04:29,019 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:04:29,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:04:29,020 INFO L85 PathProgramCache]: Analyzing trace with hash 639274816, now seen corresponding path program 28 times [2022-12-14 12:04:29,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:04:29,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595531414] [2022-12-14 12:04:29,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:04:29,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:04:29,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:04:29,294 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-12-14 12:04:29,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:04:29,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595531414] [2022-12-14 12:04:29,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595531414] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:04:29,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532456385] [2022-12-14 12:04:29,295 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:04:29,295 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:04:29,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:04:29,295 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:04:29,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 12:04:29,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:04:29,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 12:04:29,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:04:29,537 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-12-14 12:04:29,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:04:29,713 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-12-14 12:04:29,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532456385] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:04:29,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1472092327] [2022-12-14 12:04:29,715 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:04:29,715 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:04:29,715 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:04:29,715 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:04:29,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:04:29,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:29,742 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:04:29,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:04:29,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:29,750 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 [2022-12-14 12:04:29,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:29,766 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 31 treesize of output 33 [2022-12-14 12:04:29,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:29,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:29,813 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:04:29,814 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:04:29,848 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 16 treesize of output 12 [2022-12-14 12:04:29,918 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:04:30,416 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14531#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:04:30,416 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:04:30,416 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:04:30,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2022-12-14 12:04:30,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78876699] [2022-12-14 12:04:30,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:04:30,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-12-14 12:04:30,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:04:30,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-12-14 12:04:30,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=1372, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 12:04:30,418 INFO L87 Difference]: Start difference. First operand 84 states and 91 transitions. Second operand has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:04:30,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:04:30,759 INFO L93 Difference]: Finished difference Result 166 states and 180 transitions. [2022-12-14 12:04:30,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 12:04:30,760 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-12-14 12:04:30,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:04:30,760 INFO L225 Difference]: With dead ends: 166 [2022-12-14 12:04:30,760 INFO L226 Difference]: Without dead ends: 85 [2022-12-14 12:04:30,761 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 130 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1375 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=561, Invalid=2195, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 12:04:30,761 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:04:30,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 21 Invalid, 465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:04:30,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-12-14 12:04:30,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-12-14 12:04:30,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0952380952380953) internal successors, (92), 84 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:04:30,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 92 transitions. [2022-12-14 12:04:30,788 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 92 transitions. Word has length 60 [2022-12-14 12:04:30,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:04:30,788 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 92 transitions. [2022-12-14 12:04:30,788 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:04:30,788 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 92 transitions. [2022-12-14 12:04:30,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 12:04:30,788 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:04:30,788 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:04:30,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-12-14 12:04:30,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:04:30,990 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:04:30,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:04:30,990 INFO L85 PathProgramCache]: Analyzing trace with hash -1893500104, now seen corresponding path program 29 times [2022-12-14 12:04:30,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:04:30,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096680616] [2022-12-14 12:04:30,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:04:30,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:04:31,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:04:31,301 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-12-14 12:04:31,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:04:31,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096680616] [2022-12-14 12:04:31,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096680616] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:04:31,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499454421] [2022-12-14 12:04:31,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:04:31,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:04:31,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:04:31,303 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:04:31,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 12:04:31,510 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 12:04:31,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:04:31,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 12:04:31,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:04:31,870 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-12-14 12:04:31,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:04:32,133 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-12-14 12:04:32,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499454421] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:04:32,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [358137738] [2022-12-14 12:04:32,134 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:04:32,134 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:04:32,134 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:04:32,134 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:04:32,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:04:32,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:32,159 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:04:32,159 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:04:32,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:32,185 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:04:32,185 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:04:32,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:32,199 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 31 treesize of output 33 [2022-12-14 12:04:32,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:32,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:04:32,241 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:04:32,241 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:04:32,267 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 16 treesize of output 12 [2022-12-14 12:04:32,331 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:04:32,950 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15455#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:04:32,951 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:04:32,951 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:04:32,951 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2022-12-14 12:04:32,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924754086] [2022-12-14 12:04:32,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:04:32,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 12:04:32,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:04:32,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 12:04:32,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=2331, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 12:04:32,952 INFO L87 Difference]: Start difference. First operand 85 states and 92 transitions. Second operand has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:04:33,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:04:33,320 INFO L93 Difference]: Finished difference Result 114 states and 126 transitions. [2022-12-14 12:04:33,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 12:04:33,321 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2022-12-14 12:04:33,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:04:33,321 INFO L225 Difference]: With dead ends: 114 [2022-12-14 12:04:33,321 INFO L226 Difference]: Without dead ends: 65 [2022-12-14 12:04:33,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 111 SyntacticMatches, 44 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3380 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=817, Invalid=3473, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 12:04:33,322 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 283 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 660 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:04:33,322 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [283 Valid, 11 Invalid, 660 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:04:33,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-12-14 12:04:33,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-12-14 12:04:33,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:04:33,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2022-12-14 12:04:33,341 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 61 [2022-12-14 12:04:33,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:04:33,341 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2022-12-14 12:04:33,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:04:33,341 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2022-12-14 12:04:33,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-12-14 12:04:33,341 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:04:33,341 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:04:33,346 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-12-14 12:04:33,542 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:04:33,543 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:04:33,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:04:33,544 INFO L85 PathProgramCache]: Analyzing trace with hash 2016228281, now seen corresponding path program 30 times [2022-12-14 12:04:33,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:04:33,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272076898] [2022-12-14 12:04:33,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:04:33,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:04:33,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:04:42,652 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 15 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:04:42,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:04:42,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272076898] [2022-12-14 12:04:42,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272076898] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:04:42,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659757522] [2022-12-14 12:04:42,653 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:04:42,653 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:04:42,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:04:42,653 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:04:42,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 12:04:42,739 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:04:42,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:04:42,742 WARN L261 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 210 conjunts are in the unsatisfiable core [2022-12-14 12:04:42,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:04:43,221 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 15 treesize of output 11 [2022-12-14 12:04:49,433 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:04:49,434 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:04:49,434 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 35 treesize of output 14 [2022-12-14 12:04:49,627 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:04:49,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:05:02,927 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 12:05:02,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659757522] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:05:02,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1196561088] [2022-12-14 12:05:02,928 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:05:02,928 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:05:02,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:05:02,928 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:05:02,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:05:02,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:02,956 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:05:02,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:05:02,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:02,984 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:05:02,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:05:03,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:03,002 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 31 treesize of output 33 [2022-12-14 12:05:03,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:03,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:03,046 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:05:03,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:05:03,072 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 16 treesize of output 12 [2022-12-14 12:05:03,139 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:05:07,396 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16355#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:05:07,396 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:05:07,396 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:05:07,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 61, 50] total 146 [2022-12-14 12:05:07,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743533358] [2022-12-14 12:05:07,396 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:05:07,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2022-12-14 12:05:07,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:05:07,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2022-12-14 12:05:07,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=22070, Unknown=0, NotChecked=0, Total=22650 [2022-12-14 12:05:07,398 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand has 146 states, 146 states have (on average 1.0753424657534247) internal successors, (157), 146 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:05:23,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:05:23,027 INFO L93 Difference]: Finished difference Result 105 states and 112 transitions. [2022-12-14 12:05:23,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-12-14 12:05:23,027 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 1.0753424657534247) internal successors, (157), 146 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-12-14 12:05:23,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:05:23,027 INFO L225 Difference]: With dead ends: 105 [2022-12-14 12:05:23,028 INFO L226 Difference]: Without dead ends: 102 [2022-12-14 12:05:23,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 64 SyntacticMatches, 40 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11032 ImplicationChecksByTransitivity, 37.3s TimeCoverageRelationStatistics Valid=1176, Invalid=33606, Unknown=0, NotChecked=0, Total=34782 [2022-12-14 12:05:23,030 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 6129 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 6256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 6129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-12-14 12:05:23,030 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 187 Invalid, 6256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 6129 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2022-12-14 12:05:23,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-12-14 12:05:23,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2022-12-14 12:05:23,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0888888888888888) internal successors, (98), 90 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:05:23,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2022-12-14 12:05:23,079 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 64 [2022-12-14 12:05:23,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:05:23,079 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2022-12-14 12:05:23,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 1.0753424657534247) internal successors, (157), 146 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:05:23,080 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2022-12-14 12:05:23,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-12-14 12:05:23,080 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:05:23,080 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:05:23,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-12-14 12:05:23,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-12-14 12:05:23,281 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:05:23,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:05:23,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1335466398, now seen corresponding path program 31 times [2022-12-14 12:05:23,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:05:23,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149517227] [2022-12-14 12:05:23,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:05:23,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:05:23,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:05:23,574 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-12-14 12:05:23,574 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:05:23,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149517227] [2022-12-14 12:05:23,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149517227] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:05:23,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886533157] [2022-12-14 12:05:23,575 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:05:23,575 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:05:23,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:05:23,576 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:05:23,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 12:05:23,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:05:23,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 12:05:23,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:05:23,903 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-12-14 12:05:23,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:05:24,094 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-12-14 12:05:24,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886533157] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:05:24,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1427731384] [2022-12-14 12:05:24,096 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:05:24,096 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:05:24,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:05:24,096 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:05:24,096 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:05:24,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:24,129 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:05:24,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:05:24,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:24,158 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:05:24,158 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:05:24,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:24,176 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 26 treesize of output 28 [2022-12-14 12:05:24,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:24,211 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:05:24,229 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:05:24,230 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:05:24,291 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 16 treesize of output 12 [2022-12-14 12:05:24,364 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:05:24,881 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17235#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:05:24,881 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:05:24,881 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:05:24,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2022-12-14 12:05:24,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954590366] [2022-12-14 12:05:24,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:05:24,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 12:05:24,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:05:24,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 12:05:24,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1576, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 12:05:24,882 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:05:25,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:05:25,230 INFO L93 Difference]: Finished difference Result 180 states and 194 transitions. [2022-12-14 12:05:25,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 12:05:25,231 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2022-12-14 12:05:25,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:05:25,231 INFO L225 Difference]: With dead ends: 180 [2022-12-14 12:05:25,231 INFO L226 Difference]: Without dead ends: 92 [2022-12-14 12:05:25,231 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 141 SyntacticMatches, 35 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1609 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=652, Invalid=2540, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 12:05:25,232 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:05:25,232 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 19 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:05:25,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-12-14 12:05:25,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2022-12-14 12:05:25,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.0879120879120878) internal successors, (99), 91 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:05:25,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2022-12-14 12:05:25,263 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 65 [2022-12-14 12:05:25,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:05:25,263 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2022-12-14 12:05:25,263 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:05:25,264 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2022-12-14 12:05:25,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-12-14 12:05:25,264 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:05:25,264 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:05:25,268 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-12-14 12:05:25,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:05:25,465 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:05:25,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:05:25,466 INFO L85 PathProgramCache]: Analyzing trace with hash 1449801066, now seen corresponding path program 32 times [2022-12-14 12:05:25,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:05:25,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137532898] [2022-12-14 12:05:25,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:05:25,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:05:25,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:05:25,796 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-12-14 12:05:25,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:05:25,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137532898] [2022-12-14 12:05:25,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137532898] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:05:25,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388294328] [2022-12-14 12:05:25,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:05:25,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:05:25,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:05:25,798 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:05:25,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 12:05:25,988 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 12:05:25,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:05:25,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 12:05:25,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:05:26,345 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-12-14 12:05:26,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:05:26,640 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-12-14 12:05:26,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [388294328] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:05:26,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1049633475] [2022-12-14 12:05:26,641 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:05:26,641 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:05:26,641 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:05:26,641 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:05:26,641 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:05:26,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:26,674 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:05:26,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:05:26,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:26,683 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 [2022-12-14 12:05:26,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:26,700 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 31 treesize of output 33 [2022-12-14 12:05:26,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:26,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:05:26,745 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:05:26,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:05:26,785 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 16 treesize of output 12 [2022-12-14 12:05:26,862 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:05:27,844 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18237#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:05:27,844 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:05:27,844 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:05:27,844 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2022-12-14 12:05:27,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469498788] [2022-12-14 12:05:27,844 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:05:27,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 12:05:27,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:05:27,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 12:05:27,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=491, Invalid=2701, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 12:05:27,845 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:05:28,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:05:28,159 INFO L93 Difference]: Finished difference Result 123 states and 135 transitions. [2022-12-14 12:05:28,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 12:05:28,159 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2022-12-14 12:05:28,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:05:28,160 INFO L225 Difference]: With dead ends: 123 [2022-12-14 12:05:28,160 INFO L226 Difference]: Without dead ends: 70 [2022-12-14 12:05:28,160 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 120 SyntacticMatches, 48 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4001 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=948, Invalid=4022, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 12:05:28,160 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 199 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:05:28,161 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 15 Invalid, 787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:05:28,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-12-14 12:05:28,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2022-12-14 12:05:28,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 69 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:05:28,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2022-12-14 12:05:28,183 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 66 [2022-12-14 12:05:28,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:05:28,183 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2022-12-14 12:05:28,183 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:05:28,184 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2022-12-14 12:05:28,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-12-14 12:05:28,184 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:05:28,184 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:05:28,189 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 12:05:28,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-12-14 12:05:28,385 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:05:28,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:05:28,386 INFO L85 PathProgramCache]: Analyzing trace with hash -1867121273, now seen corresponding path program 33 times [2022-12-14 12:05:28,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:05:28,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722717182] [2022-12-14 12:05:28,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:05:28,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:05:28,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:05:39,720 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 3 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:05:39,720 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:05:39,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722717182] [2022-12-14 12:05:39,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [722717182] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:05:39,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802404908] [2022-12-14 12:05:39,720 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:05:39,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:05:39,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:05:39,721 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:05:39,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 12:05:39,854 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:05:39,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:05:39,858 WARN L261 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 230 conjunts are in the unsatisfiable core [2022-12-14 12:05:39,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:05:40,079 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 13 treesize of output 9 [2022-12-14 12:05:45,795 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:05:45,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:06:00,473 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-12-14 12:06:00,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802404908] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:06:00,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1381210503] [2022-12-14 12:06:00,474 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:06:00,475 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:06:00,475 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:06:00,475 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:06:00,475 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:06:00,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:00,497 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:06:00,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:06:00,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:00,521 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:06:00,522 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:06:00,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:00,537 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 26 treesize of output 28 [2022-12-14 12:06:00,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:00,571 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:06:00,586 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:06:00,586 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:06:00,636 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 16 treesize of output 12 [2022-12-14 12:06:00,718 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:06:06,535 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19205#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:06:06,535 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:06:06,535 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:06:06,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 66, 54] total 154 [2022-12-14 12:06:06,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995837210] [2022-12-14 12:06:06,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:06:06,536 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2022-12-14 12:06:06,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:06:06,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2022-12-14 12:06:06,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=735, Invalid=24387, Unknown=0, NotChecked=0, Total=25122 [2022-12-14 12:06:06,538 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 154 states, 154 states have (on average 1.0714285714285714) internal successors, (165), 154 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:06:23,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:06:23,233 INFO L93 Difference]: Finished difference Result 113 states and 120 transitions. [2022-12-14 12:06:23,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-12-14 12:06:23,233 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 154 states have (on average 1.0714285714285714) internal successors, (165), 154 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2022-12-14 12:06:23,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:06:23,234 INFO L225 Difference]: With dead ends: 113 [2022-12-14 12:06:23,234 INFO L226 Difference]: Without dead ends: 110 [2022-12-14 12:06:23,236 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 69 SyntacticMatches, 47 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13166 ImplicationChecksByTransitivity, 40.3s TimeCoverageRelationStatistics Valid=1390, Invalid=37616, Unknown=0, NotChecked=0, Total=39006 [2022-12-14 12:06:23,236 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 6514 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 6574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 6514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-12-14 12:06:23,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 181 Invalid, 6574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 6514 Invalid, 0 Unknown, 0 Unchecked, 6.3s Time] [2022-12-14 12:06:23,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-12-14 12:06:23,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2022-12-14 12:06:23,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0824742268041236) internal successors, (105), 97 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:06:23,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2022-12-14 12:06:23,275 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 69 [2022-12-14 12:06:23,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:06:23,276 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2022-12-14 12:06:23,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 154 states have (on average 1.0714285714285714) internal successors, (165), 154 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:06:23,276 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2022-12-14 12:06:23,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-12-14 12:06:23,276 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:06:23,276 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:06:23,281 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-12-14 12:06:23,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:06:23,477 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:06:23,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:06:23,478 INFO L85 PathProgramCache]: Analyzing trace with hash -888190272, now seen corresponding path program 34 times [2022-12-14 12:06:23,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:06:23,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159030309] [2022-12-14 12:06:23,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:06:23,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:06:23,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:06:23,863 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-12-14 12:06:23,863 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:06:23,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159030309] [2022-12-14 12:06:23,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1159030309] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:06:23,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992006565] [2022-12-14 12:06:23,864 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:06:23,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:06:23,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:06:23,865 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:06:23,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 12:06:23,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:06:23,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 12:06:23,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:06:24,155 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-12-14 12:06:24,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:06:24,337 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-12-14 12:06:24,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992006565] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:06:24,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1119616790] [2022-12-14 12:06:24,338 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:06:24,338 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:06:24,338 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:06:24,338 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:06:24,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:06:24,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:24,364 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:06:24,364 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:06:24,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:24,371 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 [2022-12-14 12:06:24,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:24,389 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 26 treesize of output 28 [2022-12-14 12:06:24,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:24,425 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:06:24,443 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:06:24,444 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:06:24,498 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 16 treesize of output 12 [2022-12-14 12:06:24,570 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:06:25,169 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20154#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:06:25,169 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:06:25,169 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:06:25,169 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-12-14 12:06:25,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521692113] [2022-12-14 12:06:25,170 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:06:25,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-12-14 12:06:25,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:06:25,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-12-14 12:06:25,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=1794, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 12:06:25,171 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:06:25,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:06:25,574 INFO L93 Difference]: Finished difference Result 194 states and 208 transitions. [2022-12-14 12:06:25,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 12:06:25,574 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2022-12-14 12:06:25,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:06:25,575 INFO L225 Difference]: With dead ends: 194 [2022-12-14 12:06:25,575 INFO L226 Difference]: Without dead ends: 99 [2022-12-14 12:06:25,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 152 SyntacticMatches, 38 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1861 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=750, Invalid=2910, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 12:06:25,576 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:06:25,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 11 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:06:25,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-12-14 12:06:25,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-12-14 12:06:25,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0816326530612246) internal successors, (106), 98 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:06:25,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 106 transitions. [2022-12-14 12:06:25,615 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 106 transitions. Word has length 70 [2022-12-14 12:06:25,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:06:25,615 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 106 transitions. [2022-12-14 12:06:25,615 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:06:25,615 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 106 transitions. [2022-12-14 12:06:25,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-12-14 12:06:25,616 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:06:25,616 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:06:25,620 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-12-14 12:06:25,816 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:06:25,817 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:06:25,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:06:25,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1212440392, now seen corresponding path program 35 times [2022-12-14 12:06:25,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:06:25,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75743295] [2022-12-14 12:06:25,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:06:25,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:06:25,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:06:26,191 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-12-14 12:06:26,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:06:26,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75743295] [2022-12-14 12:06:26,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75743295] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:06:26,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209838523] [2022-12-14 12:06:26,191 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:06:26,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:06:26,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:06:26,192 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:06:26,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 12:06:26,465 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 12:06:26,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:06:26,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 12:06:26,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:06:26,929 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-12-14 12:06:26,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:06:27,279 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-12-14 12:06:27,279 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209838523] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:06:27,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1425639937] [2022-12-14 12:06:27,280 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:06:27,280 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:06:27,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:06:27,280 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:06:27,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:06:27,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:27,301 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:06:27,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:06:27,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:27,307 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 [2022-12-14 12:06:27,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:27,324 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 31 treesize of output 33 [2022-12-14 12:06:27,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:27,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:06:27,362 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:06:27,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:06:27,389 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 16 treesize of output 12 [2022-12-14 12:06:27,452 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:06:27,992 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21234#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:06:27,992 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:06:27,992 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:06:27,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2022-12-14 12:06:27,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361045211] [2022-12-14 12:06:27,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:06:27,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-12-14 12:06:27,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:06:27,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-12-14 12:06:27,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=562, Invalid=3098, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 12:06:27,994 INFO L87 Difference]: Start difference. First operand 99 states and 106 transitions. Second operand has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:06:28,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:06:28,434 INFO L93 Difference]: Finished difference Result 132 states and 144 transitions. [2022-12-14 12:06:28,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 12:06:28,435 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2022-12-14 12:06:28,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:06:28,435 INFO L225 Difference]: With dead ends: 132 [2022-12-14 12:06:28,435 INFO L226 Difference]: Without dead ends: 75 [2022-12-14 12:06:28,435 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 142 SyntacticMatches, 39 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3842 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1089, Invalid=4611, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 12:06:28,436 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 202 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 232 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 882 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 232 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:06:28,436 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [202 Valid, 15 Invalid, 882 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [232 Valid, 650 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:06:28,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-12-14 12:06:28,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-12-14 12:06:28,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 74 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:06:28,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2022-12-14 12:06:28,463 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 71 [2022-12-14 12:06:28,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:06:28,463 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2022-12-14 12:06:28,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:06:28,463 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2022-12-14 12:06:28,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-12-14 12:06:28,464 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:06:28,464 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:06:28,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-12-14 12:06:28,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 12:06:28,665 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:06:28,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:06:28,665 INFO L85 PathProgramCache]: Analyzing trace with hash -106164807, now seen corresponding path program 36 times [2022-12-14 12:06:28,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:06:28,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421227202] [2022-12-14 12:06:28,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:06:28,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:06:28,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:06:44,082 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 3 proven. 452 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:06:44,083 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:06:44,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421227202] [2022-12-14 12:06:44,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421227202] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:06:44,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249099956] [2022-12-14 12:06:44,083 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:06:44,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:06:44,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:06:44,084 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:06:44,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 12:06:44,185 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:06:44,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:06:44,189 WARN L261 TraceCheckSpWp]: Trace formula consists of 441 conjuncts, 246 conjunts are in the unsatisfiable core [2022-12-14 12:06:44,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:06:44,492 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 13 treesize of output 9 [2022-12-14 12:06:51,612 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:06:51,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:07:09,972 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 364 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-12-14 12:07:09,972 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249099956] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:07:09,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1650781266] [2022-12-14 12:07:09,973 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:07:09,973 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:07:09,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:07:09,973 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:07:09,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:07:09,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:09,999 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:07:09,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:07:10,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:10,006 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 [2022-12-14 12:07:10,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:10,020 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 31 treesize of output 33 [2022-12-14 12:07:10,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:10,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:10,060 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:07:10,060 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:07:10,086 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 16 treesize of output 12 [2022-12-14 12:07:10,145 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:07:14,223 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22272#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:07:14,223 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:07:14,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:07:14,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 71, 58] total 164 [2022-12-14 12:07:14,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505885584] [2022-12-14 12:07:14,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:07:14,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 164 states [2022-12-14 12:07:14,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:07:14,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2022-12-14 12:07:14,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=723, Invalid=27669, Unknown=0, NotChecked=0, Total=28392 [2022-12-14 12:07:14,225 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 164 states, 164 states have (on average 1.0670731707317074) internal successors, (175), 164 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:07:35,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:07:35,495 INFO L93 Difference]: Finished difference Result 121 states and 128 transitions. [2022-12-14 12:07:35,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-12-14 12:07:35,495 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 1.0670731707317074) internal successors, (175), 164 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2022-12-14 12:07:35,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:07:35,496 INFO L225 Difference]: With dead ends: 121 [2022-12-14 12:07:35,496 INFO L226 Difference]: Without dead ends: 118 [2022-12-14 12:07:35,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 86 SyntacticMatches, 40 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13326 ImplicationChecksByTransitivity, 46.9s TimeCoverageRelationStatistics Valid=1468, Invalid=42842, Unknown=0, NotChecked=0, Total=44310 [2022-12-14 12:07:35,498 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 7364 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 7461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 7364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2022-12-14 12:07:35,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 195 Invalid, 7461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 7364 Invalid, 0 Unknown, 0 Unchecked, 7.4s Time] [2022-12-14 12:07:35,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-12-14 12:07:35,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 105. [2022-12-14 12:07:35,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0769230769230769) internal successors, (112), 104 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:07:35,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2022-12-14 12:07:35,558 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 74 [2022-12-14 12:07:35,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:07:35,559 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2022-12-14 12:07:35,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 164 states, 164 states have (on average 1.0670731707317074) internal successors, (175), 164 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:07:35,559 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2022-12-14 12:07:35,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-12-14 12:07:35,559 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:07:35,559 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:07:35,564 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 12:07:35,760 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-12-14 12:07:35,760 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:07:35,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:07:35,761 INFO L85 PathProgramCache]: Analyzing trace with hash 653420898, now seen corresponding path program 37 times [2022-12-14 12:07:35,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:07:35,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002731446] [2022-12-14 12:07:35,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:07:35,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:07:35,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:07:36,195 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-12-14 12:07:36,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:07:36,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002731446] [2022-12-14 12:07:36,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1002731446] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:07:36,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687322136] [2022-12-14 12:07:36,196 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:07:36,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:07:36,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:07:36,196 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:07:36,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 12:07:36,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:07:36,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 12:07:36,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:07:36,612 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-12-14 12:07:36,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:07:36,859 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-12-14 12:07:36,859 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687322136] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:07:36,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [89648875] [2022-12-14 12:07:36,860 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:07:36,860 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:07:36,861 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:07:36,861 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:07:36,861 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:07:36,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:36,892 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:07:36,893 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:07:36,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:36,901 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 [2022-12-14 12:07:36,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:36,914 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 31 treesize of output 33 [2022-12-14 12:07:36,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:36,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:36,960 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:07:36,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:07:36,998 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 16 treesize of output 12 [2022-12-14 12:07:37,070 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:07:37,908 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23290#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:07:37,908 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:07:37,908 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:07:37,908 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2022-12-14 12:07:37,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328537516] [2022-12-14 12:07:37,908 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:07:37,909 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 12:07:37,909 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:07:37,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 12:07:37,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=524, Invalid=2026, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 12:07:37,910 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:07:38,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:07:38,521 INFO L93 Difference]: Finished difference Result 208 states and 222 transitions. [2022-12-14 12:07:38,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 12:07:38,521 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2022-12-14 12:07:38,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:07:38,522 INFO L225 Difference]: With dead ends: 208 [2022-12-14 12:07:38,522 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 12:07:38,523 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 163 SyntacticMatches, 41 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2131 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=855, Invalid=3305, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 12:07:38,523 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 622 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 704 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 12:07:38,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 21 Invalid, 704 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 622 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 12:07:38,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 12:07:38,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2022-12-14 12:07:38,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.0761904761904761) internal successors, (113), 105 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:07:38,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 113 transitions. [2022-12-14 12:07:38,570 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 113 transitions. Word has length 75 [2022-12-14 12:07:38,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:07:38,570 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 113 transitions. [2022-12-14 12:07:38,571 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:07:38,571 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 113 transitions. [2022-12-14 12:07:38,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-12-14 12:07:38,571 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:07:38,571 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:07:38,575 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-12-14 12:07:38,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:07:38,772 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:07:38,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:07:38,773 INFO L85 PathProgramCache]: Analyzing trace with hash -119206294, now seen corresponding path program 38 times [2022-12-14 12:07:38,773 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:07:38,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797917171] [2022-12-14 12:07:38,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:07:38,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:07:38,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:07:39,202 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-12-14 12:07:39,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:07:39,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797917171] [2022-12-14 12:07:39,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797917171] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:07:39,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700183790] [2022-12-14 12:07:39,203 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:07:39,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:07:39,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:07:39,204 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:07:39,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 12:07:39,435 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 12:07:39,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:07:39,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 12:07:39,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:07:39,841 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-12-14 12:07:39,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:07:40,123 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-12-14 12:07:40,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700183790] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:07:40,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1336796779] [2022-12-14 12:07:40,124 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:07:40,124 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:07:40,124 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:07:40,124 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:07:40,124 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:07:40,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:40,144 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:07:40,144 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:07:40,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:40,163 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:07:40,164 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:07:40,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:40,175 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 31 treesize of output 33 [2022-12-14 12:07:40,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:40,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:07:40,212 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:07:40,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:07:40,254 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 16 treesize of output 12 [2022-12-14 12:07:40,337 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:07:41,046 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24448#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:07:41,046 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:07:41,046 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:07:41,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2022-12-14 12:07:41,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45535445] [2022-12-14 12:07:41,046 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:07:41,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-12-14 12:07:41,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:07:41,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-12-14 12:07:41,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=3522, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 12:07:41,048 INFO L87 Difference]: Start difference. First operand 106 states and 113 transitions. Second operand has 60 states, 60 states have (on average 1.5) internal successors, (90), 60 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:07:41,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:07:41,589 INFO L93 Difference]: Finished difference Result 141 states and 153 transitions. [2022-12-14 12:07:41,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 12:07:41,589 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.5) internal successors, (90), 60 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2022-12-14 12:07:41,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:07:41,589 INFO L225 Difference]: With dead ends: 141 [2022-12-14 12:07:41,590 INFO L226 Difference]: Without dead ends: 80 [2022-12-14 12:07:41,590 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 138 SyntacticMatches, 56 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5399 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1240, Invalid=5240, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 12:07:41,590 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 346 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 1019 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 12:07:41,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [346 Valid, 21 Invalid, 1019 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 12:07:41,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-12-14 12:07:41,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2022-12-14 12:07:41,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 79 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:07:41,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2022-12-14 12:07:41,623 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 76 [2022-12-14 12:07:41,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:07:41,623 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2022-12-14 12:07:41,624 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.5) internal successors, (90), 60 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:07:41,624 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2022-12-14 12:07:41,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-12-14 12:07:41,624 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:07:41,624 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:07:41,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-12-14 12:07:41,824 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-12-14 12:07:41,825 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:07:41,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:07:41,825 INFO L85 PathProgramCache]: Analyzing trace with hash -906808313, now seen corresponding path program 39 times [2022-12-14 12:07:41,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:07:41,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346466749] [2022-12-14 12:07:41,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:07:41,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:07:42,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:07:56,484 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 1 proven. 524 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:07:56,484 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:07:56,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346466749] [2022-12-14 12:07:56,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346466749] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:07:56,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951316668] [2022-12-14 12:07:56,484 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:07:56,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:07:56,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:07:56,485 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:07:56,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 12:07:56,590 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:07:56,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:07:56,594 WARN L261 TraceCheckSpWp]: Trace formula consists of 470 conjuncts, 266 conjunts are in the unsatisfiable core [2022-12-14 12:07:56,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:07:56,826 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 13 treesize of output 9 [2022-12-14 12:08:07,578 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:08:07,579 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:08:07,580 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 35 treesize of output 14 [2022-12-14 12:08:07,803 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:08:07,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:08:33,828 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-12-14 12:08:33,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1951316668] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:08:33,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [824362034] [2022-12-14 12:08:33,829 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:08:33,829 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:08:33,829 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:08:33,829 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:08:33,829 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:08:33,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:08:33,855 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:08:33,855 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:08:33,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:08:33,861 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 [2022-12-14 12:08:33,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:08:33,872 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 26 treesize of output 28 [2022-12-14 12:08:33,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:08:33,902 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:08:33,922 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:08:33,922 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:08:33,966 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 16 treesize of output 12 [2022-12-14 12:08:34,030 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:08:40,613 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25558#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:08:40,613 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:08:40,613 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:08:40,614 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 76, 62] total 176 [2022-12-14 12:08:40,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327084211] [2022-12-14 12:08:40,614 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:08:40,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 176 states [2022-12-14 12:08:40,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:08:40,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2022-12-14 12:08:40,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=31876, Unknown=0, NotChecked=0, Total=32580 [2022-12-14 12:08:40,617 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 176 states, 176 states have (on average 1.0625) internal successors, (187), 176 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:09:07,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:09:07,562 INFO L93 Difference]: Finished difference Result 129 states and 136 transitions. [2022-12-14 12:09:07,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-12-14 12:09:07,563 INFO L78 Accepts]: Start accepts. Automaton has has 176 states, 176 states have (on average 1.0625) internal successors, (187), 176 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2022-12-14 12:09:07,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:09:07,563 INFO L225 Difference]: With dead ends: 129 [2022-12-14 12:09:07,563 INFO L226 Difference]: Without dead ends: 126 [2022-12-14 12:09:07,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 92 SyntacticMatches, 42 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12354 ImplicationChecksByTransitivity, 65.7s TimeCoverageRelationStatistics Valid=1543, Invalid=49307, Unknown=0, NotChecked=0, Total=50850 [2022-12-14 12:09:07,565 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 8544 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 8723 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 8544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.3s IncrementalHoareTripleChecker+Time [2022-12-14 12:09:07,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 207 Invalid, 8723 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 8544 Invalid, 0 Unknown, 0 Unchecked, 9.3s Time] [2022-12-14 12:09:07,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-12-14 12:09:07,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 112. [2022-12-14 12:09:07,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.072072072072072) internal successors, (119), 111 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:09:07,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 119 transitions. [2022-12-14 12:09:07,618 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 119 transitions. Word has length 79 [2022-12-14 12:09:07,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:09:07,618 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 119 transitions. [2022-12-14 12:09:07,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 176 states, 176 states have (on average 1.0625) internal successors, (187), 176 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:09:07,618 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 119 transitions. [2022-12-14 12:09:07,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-12-14 12:09:07,618 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:09:07,618 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:09:07,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-12-14 12:09:07,819 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:09:07,819 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:09:07,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:09:07,820 INFO L85 PathProgramCache]: Analyzing trace with hash -1298688448, now seen corresponding path program 40 times [2022-12-14 12:09:07,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:09:07,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397601510] [2022-12-14 12:09:07,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:09:07,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:09:07,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:09:08,256 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 106 proven. 119 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-12-14 12:09:08,256 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:09:08,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397601510] [2022-12-14 12:09:08,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397601510] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:09:08,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309481446] [2022-12-14 12:09:08,257 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:09:08,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:09:08,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:09:08,257 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:09:08,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 12:09:08,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:09:08,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 12:09:08,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:09:08,627 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-12-14 12:09:08,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:09:08,874 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-12-14 12:09:08,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309481446] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:09:08,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [342371225] [2022-12-14 12:09:08,875 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:09:08,876 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:09:08,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:09:08,876 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:09:08,876 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:09:08,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:09:08,899 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:09:08,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:09:08,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:09:08,923 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:09:08,923 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:09:08,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:09:08,941 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 31 treesize of output 33 [2022-12-14 12:09:08,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:09:08,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:09:08,981 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:09:08,981 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:09:09,015 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 16 treesize of output 12 [2022-12-14 12:09:09,090 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:09:10,150 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26645#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:09:10,150 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:09:10,150 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:09:10,151 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-12-14 12:09:10,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657649488] [2022-12-14 12:09:10,151 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:09:10,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 12:09:10,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:09:10,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 12:09:10,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=590, Invalid=2272, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 12:09:10,152 INFO L87 Difference]: Start difference. First operand 112 states and 119 transitions. Second operand has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:09:10,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:09:10,755 INFO L93 Difference]: Finished difference Result 222 states and 236 transitions. [2022-12-14 12:09:10,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 12:09:10,756 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2022-12-14 12:09:10,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:09:10,757 INFO L225 Difference]: With dead ends: 222 [2022-12-14 12:09:10,757 INFO L226 Difference]: Without dead ends: 113 [2022-12-14 12:09:10,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 159 SyntacticMatches, 59 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3109 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=967, Invalid=3725, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 12:09:10,758 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 590 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 590 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:09:10,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 15 Invalid, 670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 590 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:09:10,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-12-14 12:09:10,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-12-14 12:09:10,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0714285714285714) internal successors, (120), 112 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:09:10,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 120 transitions. [2022-12-14 12:09:10,814 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 120 transitions. Word has length 80 [2022-12-14 12:09:10,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:09:10,814 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 120 transitions. [2022-12-14 12:09:10,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:09:10,814 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 120 transitions. [2022-12-14 12:09:10,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-12-14 12:09:10,815 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:09:10,815 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:09:10,820 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-12-14 12:09:11,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:09:11,015 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:09:11,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:09:11,016 INFO L85 PathProgramCache]: Analyzing trace with hash -450177480, now seen corresponding path program 41 times [2022-12-14 12:09:11,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:09:11,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854300115] [2022-12-14 12:09:11,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:09:11,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:09:11,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:09:11,512 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-12-14 12:09:11,512 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:09:11,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854300115] [2022-12-14 12:09:11,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854300115] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:09:11,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869763829] [2022-12-14 12:09:11,513 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:09:11,513 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:09:11,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:09:11,514 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:09:11,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 12:09:11,884 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 12:09:11,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:09:11,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 12:09:11,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:09:12,148 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-12-14 12:09:12,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:09:12,433 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-12-14 12:09:12,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869763829] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:09:12,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1353154613] [2022-12-14 12:09:12,434 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:09:12,434 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:09:12,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:09:12,434 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:09:12,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:09:12,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:09:12,460 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:09:12,460 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:09:12,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:09:12,468 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 [2022-12-14 12:09:12,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:09:12,481 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 31 treesize of output 33 [2022-12-14 12:09:12,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:09:12,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:09:12,533 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:09:12,533 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:09:12,562 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 16 treesize of output 12 [2022-12-14 12:09:12,620 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:09:12,793 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27867#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:09:12,793 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:09:12,793 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:09:12,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 50 [2022-12-14 12:09:12,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829552890] [2022-12-14 12:09:12,794 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:09:12,794 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 12:09:12,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:09:12,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 12:09:12,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=2371, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 12:09:12,795 INFO L87 Difference]: Start difference. First operand 113 states and 120 transitions. Second operand has 50 states, 50 states have (on average 1.58) internal successors, (79), 50 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:09:13,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:09:13,156 INFO L93 Difference]: Finished difference Result 150 states and 162 transitions. [2022-12-14 12:09:13,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 12:09:13,157 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 50 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2022-12-14 12:09:13,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:09:13,157 INFO L225 Difference]: With dead ends: 150 [2022-12-14 12:09:13,157 INFO L226 Difference]: Without dead ends: 85 [2022-12-14 12:09:13,158 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 191 SyntacticMatches, 30 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2358 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1248, Invalid=3722, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 12:09:13,158 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 289 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 232 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 232 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:09:13,159 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 11 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [232 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:09:13,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-12-14 12:09:13,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-12-14 12:09:13,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 84 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:09:13,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 89 transitions. [2022-12-14 12:09:13,200 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 89 transitions. Word has length 81 [2022-12-14 12:09:13,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:09:13,200 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 89 transitions. [2022-12-14 12:09:13,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 50 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:09:13,200 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 89 transitions. [2022-12-14 12:09:13,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-12-14 12:09:13,201 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:09:13,201 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:09:13,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-12-14 12:09:13,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-12-14 12:09:13,402 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:09:13,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:09:13,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1576921159, now seen corresponding path program 42 times [2022-12-14 12:09:13,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:09:13,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113472937] [2022-12-14 12:09:13,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:09:13,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:09:13,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:09:31,857 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 6 proven. 594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:09:31,857 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:09:31,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113472937] [2022-12-14 12:09:31,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113472937] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:09:31,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1603268118] [2022-12-14 12:09:31,857 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:09:31,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:09:31,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:09:31,858 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:09:31,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-12-14 12:09:31,977 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:09:31,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:09:31,982 WARN L261 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 282 conjunts are in the unsatisfiable core [2022-12-14 12:09:31,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:09:32,361 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 13 treesize of output 9 [2022-12-14 12:09:44,502 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:09:44,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:10:15,152 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 480 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-12-14 12:10:15,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1603268118] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:10:15,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [788193594] [2022-12-14 12:10:15,153 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:10:15,153 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:10:15,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:10:15,153 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:10:15,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:10:15,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:10:15,179 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:10:15,180 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:10:15,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:10:15,185 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 [2022-12-14 12:10:15,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:10:15,198 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 26 treesize of output 28 [2022-12-14 12:10:15,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:10:15,227 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:10:15,239 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:10:15,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:10:15,289 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 16 treesize of output 12 [2022-12-14 12:10:15,348 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:10:28,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29048#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:10:28,946 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:10:28,946 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:10:28,947 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 81, 66] total 189 [2022-12-14 12:10:28,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867136261] [2022-12-14 12:10:28,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:10:28,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 189 states [2022-12-14 12:10:28,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:10:28,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 189 interpolants. [2022-12-14 12:10:28,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=779, Invalid=36663, Unknown=0, NotChecked=0, Total=37442 [2022-12-14 12:10:28,950 INFO L87 Difference]: Start difference. First operand 85 states and 89 transitions. Second operand has 189 states, 189 states have (on average 1.0582010582010581) internal successors, (200), 189 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:11:00,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:00,871 INFO L93 Difference]: Finished difference Result 137 states and 144 transitions. [2022-12-14 12:11:00,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-12-14 12:11:00,872 INFO L78 Accepts]: Start accepts. Automaton has has 189 states, 189 states have (on average 1.0582010582010581) internal successors, (200), 189 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2022-12-14 12:11:00,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:00,873 INFO L225 Difference]: With dead ends: 137 [2022-12-14 12:11:00,873 INFO L226 Difference]: Without dead ends: 134 [2022-12-14 12:11:00,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 65 SyntacticMatches, 76 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18610 ImplicationChecksByTransitivity, 83.0s TimeCoverageRelationStatistics Valid=1729, Invalid=56593, Unknown=0, NotChecked=0, Total=58322 [2022-12-14 12:11:00,875 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 9698 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 9844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 9698 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:00,875 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 225 Invalid, 9844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 9698 Invalid, 0 Unknown, 0 Unchecked, 11.2s Time] [2022-12-14 12:11:00,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-12-14 12:11:00,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 119. [2022-12-14 12:11:00,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0677966101694916) internal successors, (126), 118 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:11:00,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 126 transitions. [2022-12-14 12:11:00,964 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 126 transitions. Word has length 84 [2022-12-14 12:11:00,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:00,964 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 126 transitions. [2022-12-14 12:11:00,964 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 189 states, 189 states have (on average 1.0582010582010581) internal successors, (200), 189 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:11:00,964 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 126 transitions. [2022-12-14 12:11:00,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-12-14 12:11:00,965 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:00,965 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:00,970 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-12-14 12:11:01,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:01,165 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:01,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:01,166 INFO L85 PathProgramCache]: Analyzing trace with hash -1180033950, now seen corresponding path program 43 times [2022-12-14 12:11:01,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:01,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17284499] [2022-12-14 12:11:01,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:01,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:01,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:01,645 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 121 proven. 135 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2022-12-14 12:11:01,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:01,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17284499] [2022-12-14 12:11:01,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17284499] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:01,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742605261] [2022-12-14 12:11:01,645 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:11:01,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:01,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:01,646 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:01,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-12-14 12:11:01,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:01,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 12:11:01,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:02,135 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2022-12-14 12:11:02,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:02,360 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2022-12-14 12:11:02,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742605261] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:02,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1569933933] [2022-12-14 12:11:02,361 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:02,361 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:02,361 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:02,361 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:02,361 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:02,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:02,390 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:11:02,391 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:11:02,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:02,396 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 [2022-12-14 12:11:02,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:02,411 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 31 treesize of output 33 [2022-12-14 12:11:02,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:02,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:02,451 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:11:02,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:11:02,477 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 16 treesize of output 12 [2022-12-14 12:11:02,545 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:03,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30204#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:03,599 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:03,599 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:03,599 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2022-12-14 12:11:03,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144656141] [2022-12-14 12:11:03,599 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:03,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 12:11:03,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:03,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 12:11:03,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=660, Invalid=2532, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 12:11:03,601 INFO L87 Difference]: Start difference. First operand 119 states and 126 transitions. Second operand has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:11:04,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:04,232 INFO L93 Difference]: Finished difference Result 236 states and 250 transitions. [2022-12-14 12:11:04,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 12:11:04,232 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2022-12-14 12:11:04,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:04,233 INFO L225 Difference]: With dead ends: 236 [2022-12-14 12:11:04,233 INFO L226 Difference]: Without dead ends: 120 [2022-12-14 12:11:04,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 169 SyntacticMatches, 63 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3509 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1086, Invalid=4170, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 12:11:04,234 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 720 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 720 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:04,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 15 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 720 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:11:04,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-12-14 12:11:04,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2022-12-14 12:11:04,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.0672268907563025) internal successors, (127), 119 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:11:04,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 127 transitions. [2022-12-14 12:11:04,297 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 127 transitions. Word has length 85 [2022-12-14 12:11:04,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:04,297 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 127 transitions. [2022-12-14 12:11:04,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:11:04,298 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 127 transitions. [2022-12-14 12:11:04,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-12-14 12:11:04,298 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:04,298 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:04,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-12-14 12:11:04,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-12-14 12:11:04,499 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:04,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:04,499 INFO L85 PathProgramCache]: Analyzing trace with hash 1400379242, now seen corresponding path program 44 times [2022-12-14 12:11:04,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:04,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265123161] [2022-12-14 12:11:04,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:04,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:04,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:05,065 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 105 proven. 151 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-12-14 12:11:05,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:05,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265123161] [2022-12-14 12:11:05,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265123161] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:05,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2018689301] [2022-12-14 12:11:05,066 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:11:05,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:05,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:05,067 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:05,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-12-14 12:11:05,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 12:11:05,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:11:05,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 12:11:05,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:05,754 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-12-14 12:11:05,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:05,981 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-12-14 12:11:05,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2018689301] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:05,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1149733257] [2022-12-14 12:11:05,982 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:05,982 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:05,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:05,983 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:05,983 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:05,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:06,005 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:11:06,005 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:11:06,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:06,011 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 [2022-12-14 12:11:06,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:06,029 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 26 treesize of output 28 [2022-12-14 12:11:06,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:06,062 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:06,076 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:11:06,077 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:11:06,124 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 16 treesize of output 12 [2022-12-14 12:11:06,194 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:06,870 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31503#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:06,871 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:06,871 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:06,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 53 [2022-12-14 12:11:06,871 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427845180] [2022-12-14 12:11:06,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:06,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-12-14 12:11:06,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:06,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-12-14 12:11:06,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=669, Invalid=2637, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 12:11:06,872 INFO L87 Difference]: Start difference. First operand 120 states and 127 transitions. Second operand has 53 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:11:07,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:07,318 INFO L93 Difference]: Finished difference Result 159 states and 171 transitions. [2022-12-14 12:11:07,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 12:11:07,318 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2022-12-14 12:11:07,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:07,318 INFO L225 Difference]: With dead ends: 159 [2022-12-14 12:11:07,318 INFO L226 Difference]: Without dead ends: 90 [2022-12-14 12:11:07,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 171 SyntacticMatches, 64 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4732 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1401, Invalid=4149, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 12:11:07,319 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 234 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:07,319 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [234 Valid, 15 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:11:07,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-12-14 12:11:07,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-12-14 12:11:07,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.0561797752808988) internal successors, (94), 89 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:11:07,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2022-12-14 12:11:07,365 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 86 [2022-12-14 12:11:07,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:07,365 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2022-12-14 12:11:07,365 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:11:07,365 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2022-12-14 12:11:07,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-12-14 12:11:07,366 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:07,366 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:07,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-12-14 12:11:07,566 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:07,566 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:07,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:07,567 INFO L85 PathProgramCache]: Analyzing trace with hash -440763769, now seen corresponding path program 45 times [2022-12-14 12:11:07,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:07,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664845686] [2022-12-14 12:11:07,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:07,567 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:07,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:30,058 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 4 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:11:30,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:30,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664845686] [2022-12-14 12:11:30,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664845686] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:30,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511905557] [2022-12-14 12:11:30,059 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:11:30,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:30,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:30,060 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:30,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-12-14 12:11:30,197 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:11:30,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:11:30,202 WARN L261 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 302 conjunts are in the unsatisfiable core [2022-12-14 12:11:30,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:30,794 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 13 treesize of output 9 [2022-12-14 12:11:46,300 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 0 proven. 680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:11:46,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:12:23,187 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 0 proven. 544 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-12-14 12:12:23,187 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1511905557] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:12:23,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [175784791] [2022-12-14 12:12:23,187 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:12:23,187 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:12:23,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:12:23,188 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:12:23,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:12:23,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:23,210 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:12:23,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:12:23,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:23,234 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:12:23,235 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:12:23,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:23,248 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 26 treesize of output 28 [2022-12-14 12:12:23,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:23,279 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:12:23,299 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:12:23,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:12:23,352 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 16 treesize of output 12 [2022-12-14 12:12:23,421 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:12:34,404 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32757#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:12:34,404 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:12:34,404 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:12:34,404 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 86, 70] total 202 [2022-12-14 12:12:34,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603148582] [2022-12-14 12:12:34,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:12:34,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 202 states [2022-12-14 12:12:34,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:12:34,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2022-12-14 12:12:34,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=849, Invalid=41793, Unknown=0, NotChecked=0, Total=42642 [2022-12-14 12:12:34,407 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 202 states, 202 states have (on average 1.0544554455445545) internal successors, (213), 202 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:13:12,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:12,000 INFO L93 Difference]: Finished difference Result 145 states and 152 transitions. [2022-12-14 12:13:12,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-12-14 12:13:12,000 INFO L78 Accepts]: Start accepts. Automaton has has 202 states, 202 states have (on average 1.0544554455445545) internal successors, (213), 202 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2022-12-14 12:13:12,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:12,001 INFO L225 Difference]: With dead ends: 145 [2022-12-14 12:13:12,001 INFO L226 Difference]: Without dead ends: 142 [2022-12-14 12:13:12,003 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 85 SyntacticMatches, 63 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18931 ImplicationChecksByTransitivity, 95.6s TimeCoverageRelationStatistics Valid=1914, Invalid=64392, Unknown=0, NotChecked=0, Total=66306 [2022-12-14 12:13:12,003 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 10577 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 10770 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 10577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:12,003 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 233 Invalid, 10770 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 10577 Invalid, 0 Unknown, 0 Unchecked, 13.0s Time] [2022-12-14 12:13:12,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-12-14 12:13:12,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 126. [2022-12-14 12:13:12,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.064) internal successors, (133), 125 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:13:12,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 133 transitions. [2022-12-14 12:13:12,075 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 133 transitions. Word has length 89 [2022-12-14 12:13:12,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:12,075 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 133 transitions. [2022-12-14 12:13:12,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 202 states, 202 states have (on average 1.0544554455445545) internal successors, (213), 202 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:13:12,075 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 133 transitions. [2022-12-14 12:13:12,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-12-14 12:13:12,076 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:12,076 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:12,081 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-12-14 12:13:12,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:12,277 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:12,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:12,278 INFO L85 PathProgramCache]: Analyzing trace with hash 2124902848, now seen corresponding path program 46 times [2022-12-14 12:13:12,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:12,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013265522] [2022-12-14 12:13:12,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:12,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:12,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:12,894 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 137 proven. 152 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2022-12-14 12:13:12,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:12,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013265522] [2022-12-14 12:13:12,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013265522] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:12,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [942930531] [2022-12-14 12:13:12,894 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:13:12,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:12,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:12,895 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:12,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-12-14 12:13:13,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:13,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 533 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 12:13:13,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:13,383 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2022-12-14 12:13:13,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:13:13,619 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2022-12-14 12:13:13,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [942930531] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:13:13,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1343218598] [2022-12-14 12:13:13,620 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:13:13,620 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:13:13,620 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:13:13,620 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:13:13,620 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:13:13,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:13:13,645 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:13:13,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:13:13,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:13:13,651 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 [2022-12-14 12:13:13,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:13:13,664 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 26 treesize of output 28 [2022-12-14 12:13:13,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:13:13,708 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:13:13,723 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:13:13,724 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:13:13,770 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 16 treesize of output 12 [2022-12-14 12:13:13,837 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:13:14,564 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33982#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:13:14,564 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:13:14,564 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:13:14,564 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2022-12-14 12:13:14,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539992260] [2022-12-14 12:13:14,564 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:13:14,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-12-14 12:13:14,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:14,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-12-14 12:13:14,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=734, Invalid=2806, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 12:13:14,566 INFO L87 Difference]: Start difference. First operand 126 states and 133 transitions. Second operand has 55 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 55 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:13:15,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:15,209 INFO L93 Difference]: Finished difference Result 250 states and 264 transitions. [2022-12-14 12:13:15,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 12:13:15,210 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 55 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2022-12-14 12:13:15,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:15,210 INFO L225 Difference]: With dead ends: 250 [2022-12-14 12:13:15,211 INFO L226 Difference]: Without dead ends: 127 [2022-12-14 12:13:15,211 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 196 SyntacticMatches, 50 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3049 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1212, Invalid=4640, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 12:13:15,212 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:15,212 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 15 Invalid, 716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:13:15,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-12-14 12:13:15,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2022-12-14 12:13:15,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0634920634920635) internal successors, (134), 126 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:13:15,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 134 transitions. [2022-12-14 12:13:15,286 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 134 transitions. Word has length 90 [2022-12-14 12:13:15,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:15,286 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 134 transitions. [2022-12-14 12:13:15,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 55 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:13:15,286 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 134 transitions. [2022-12-14 12:13:15,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-12-14 12:13:15,286 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:15,286 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:15,291 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-12-14 12:13:15,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-12-14 12:13:15,488 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:15,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:15,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1527061432, now seen corresponding path program 47 times [2022-12-14 12:13:15,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:15,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477801685] [2022-12-14 12:13:15,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:15,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:15,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:15,984 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 120 proven. 169 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2022-12-14 12:13:15,985 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:15,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477801685] [2022-12-14 12:13:15,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477801685] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:15,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471310025] [2022-12-14 12:13:15,985 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:13:15,985 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:15,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:15,986 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:15,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-12-14 12:13:16,504 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-12-14 12:13:16,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:13:16,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 12:13:16,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:16,803 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2022-12-14 12:13:16,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:13:17,123 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2022-12-14 12:13:17,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471310025] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:13:17,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [735381887] [2022-12-14 12:13:17,124 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:13:17,124 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:13:17,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:13:17,125 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:13:17,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:13:17,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:13:17,149 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:13:17,149 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:13:17,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:13:17,172 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:13:17,172 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:13:17,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:13:17,186 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 26 treesize of output 28 [2022-12-14 12:13:17,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:13:17,219 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:13:17,237 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 12:13:17,237 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 12:13:17,290 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 16 treesize of output 12 [2022-12-14 12:13:17,347 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:13:17,562 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35358#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:13:17,562 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:13:17,562 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:13:17,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 56 [2022-12-14 12:13:17,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827365072] [2022-12-14 12:13:17,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:13:17,563 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-12-14 12:13:17,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:17,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-12-14 12:13:17,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=2917, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 12:13:17,564 INFO L87 Difference]: Start difference. First operand 127 states and 134 transitions. Second operand has 56 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:13:18,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:18,019 INFO L93 Difference]: Finished difference Result 168 states and 180 transitions. [2022-12-14 12:13:18,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 12:13:18,020 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 91 [2022-12-14 12:13:18,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:18,020 INFO L225 Difference]: With dead ends: 168 [2022-12-14 12:13:18,020 INFO L226 Difference]: Without dead ends: 95 [2022-12-14 12:13:18,021 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 215 SyntacticMatches, 34 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2963 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1563, Invalid=4599, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 12:13:18,021 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 280 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:18,022 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [280 Valid, 9 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:18,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-12-14 12:13:18,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-12-14 12:13:18,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.053191489361702) internal successors, (99), 94 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:13:18,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 99 transitions. [2022-12-14 12:13:18,076 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 99 transitions. Word has length 91 [2022-12-14 12:13:18,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:18,076 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 99 transitions. [2022-12-14 12:13:18,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:13:18,076 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 99 transitions. [2022-12-14 12:13:18,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-12-14 12:13:18,076 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:18,076 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:18,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-12-14 12:13:18,277 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-12-14 12:13:18,278 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:18,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:18,278 INFO L85 PathProgramCache]: Analyzing trace with hash -1275375175, now seen corresponding path program 48 times [2022-12-14 12:13:18,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:18,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633688874] [2022-12-14 12:13:18,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:18,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:18,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:42,180 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 15 proven. 750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:13:42,180 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:42,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633688874] [2022-12-14 12:13:42,180 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633688874] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:42,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652546430] [2022-12-14 12:13:42,180 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:13:42,180 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:42,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:42,181 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:42,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-12-14 12:13:42,375 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:13:42,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:13:42,381 WARN L261 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 318 conjunts are in the unsatisfiable core [2022-12-14 12:13:42,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:43,142 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 13 treesize of output 9 [2022-12-14 12:14:00,566 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:14:00,568 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:14:00,568 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 35 treesize of output 14 [2022-12-14 12:14:00,857 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 765 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:14:00,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:14:41,575 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 612 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-12-14 12:14:41,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [652546430] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:14:41,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1125658725] [2022-12-14 12:14:41,577 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:14:41,577 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:14:41,577 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:14:41,577 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:14:41,577 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:14:41,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:41,602 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:14:41,602 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:14:41,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:41,626 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:14:41,627 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:14:41,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:41,646 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 31 treesize of output 33 [2022-12-14 12:14:41,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:41,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:41,694 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:14:41,694 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:14:41,720 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 16 treesize of output 12 [2022-12-14 12:14:41,801 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:14:53,702 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36686#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:14:53,702 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:14:53,702 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:14:53,702 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 91, 74] total 216 [2022-12-14 12:14:53,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459411028] [2022-12-14 12:14:53,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:14:53,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 216 states [2022-12-14 12:14:53,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:14:53,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 216 interpolants. [2022-12-14 12:14:53,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1155, Invalid=47465, Unknown=0, NotChecked=0, Total=48620 [2022-12-14 12:14:53,706 INFO L87 Difference]: Start difference. First operand 95 states and 99 transitions. Second operand has 216 states, 216 states have (on average 1.0509259259259258) internal successors, (227), 216 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:15:36,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:15:36,631 INFO L93 Difference]: Finished difference Result 153 states and 160 transitions. [2022-12-14 12:15:36,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-12-14 12:15:36,632 INFO L78 Accepts]: Start accepts. Automaton has has 216 states, 216 states have (on average 1.0509259259259258) internal successors, (227), 216 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2022-12-14 12:15:36,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:15:36,632 INFO L225 Difference]: With dead ends: 153 [2022-12-14 12:15:36,632 INFO L226 Difference]: Without dead ends: 150 [2022-12-14 12:15:36,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 88 SyntacticMatches, 66 SemanticMatches, 273 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23842 ImplicationChecksByTransitivity, 105.9s TimeCoverageRelationStatistics Valid=2343, Invalid=73007, Unknown=0, NotChecked=0, Total=75350 [2022-12-14 12:15:36,635 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 12692 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 12816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 12692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.4s IncrementalHoareTripleChecker+Time [2022-12-14 12:15:36,635 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 267 Invalid, 12816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 12692 Invalid, 0 Unknown, 0 Unchecked, 15.4s Time] [2022-12-14 12:15:36,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2022-12-14 12:15:36,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 133. [2022-12-14 12:15:36,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0606060606060606) internal successors, (140), 132 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:15:36,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 140 transitions. [2022-12-14 12:15:36,717 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 140 transitions. Word has length 94 [2022-12-14 12:15:36,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:15:36,718 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 140 transitions. [2022-12-14 12:15:36,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 216 states, 216 states have (on average 1.0509259259259258) internal successors, (227), 216 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:15:36,718 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 140 transitions. [2022-12-14 12:15:36,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-12-14 12:15:36,718 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:15:36,718 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:15:36,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-12-14 12:15:36,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:15:36,919 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:15:36,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:15:36,920 INFO L85 PathProgramCache]: Analyzing trace with hash 469335906, now seen corresponding path program 49 times [2022-12-14 12:15:36,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:15:36,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134336482] [2022-12-14 12:15:36,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:15:36,921 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:15:36,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:15:37,490 INFO L134 CoverageAnalysis]: Checked inductivity of 783 backedges. 154 proven. 170 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2022-12-14 12:15:37,490 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:15:37,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134336482] [2022-12-14 12:15:37,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134336482] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:15:37,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413579203] [2022-12-14 12:15:37,490 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:15:37,490 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:15:37,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:15:37,491 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:15:37,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-12-14 12:15:37,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:15:37,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 12:15:37,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:15:38,140 INFO L134 CoverageAnalysis]: Checked inductivity of 783 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2022-12-14 12:15:38,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:15:38,529 INFO L134 CoverageAnalysis]: Checked inductivity of 783 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2022-12-14 12:15:38,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1413579203] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:15:38,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2024866376] [2022-12-14 12:15:38,530 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:15:38,530 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:15:38,530 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:15:38,530 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:15:38,530 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:15:38,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:15:38,559 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 12:15:38,559 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 12:15:38,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:15:38,587 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:15:38,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:15:38,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:15:38,604 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 31 treesize of output 33 [2022-12-14 12:15:38,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:15:38,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:15:38,650 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:15:38,650 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:15:38,682 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 16 treesize of output 12 [2022-12-14 12:15:38,749 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:15:39,838 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37980#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:15:39,838 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:15:39,838 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:15:39,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 58 [2022-12-14 12:15:39,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486407532] [2022-12-14 12:15:39,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:15:39,839 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-12-14 12:15:39,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:15:39,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-12-14 12:15:39,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=812, Invalid=3094, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 12:15:39,839 INFO L87 Difference]: Start difference. First operand 133 states and 140 transitions. Second operand has 58 states, 58 states have (on average 1.206896551724138) internal successors, (70), 58 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:15:40,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:15:40,549 INFO L93 Difference]: Finished difference Result 264 states and 278 transitions. [2022-12-14 12:15:40,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 12:15:40,549 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.206896551724138) internal successors, (70), 58 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2022-12-14 12:15:40,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:15:40,549 INFO L225 Difference]: With dead ends: 264 [2022-12-14 12:15:40,549 INFO L226 Difference]: Without dead ends: 134 [2022-12-14 12:15:40,550 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 207 SyntacticMatches, 53 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3391 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1345, Invalid=5135, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 12:15:40,550 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 816 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 904 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 816 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 12:15:40,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 27 Invalid, 904 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 816 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 12:15:40,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-12-14 12:15:40,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2022-12-14 12:15:40,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.0601503759398496) internal successors, (141), 133 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:15:40,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 141 transitions. [2022-12-14 12:15:40,633 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 141 transitions. Word has length 95 [2022-12-14 12:15:40,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:15:40,633 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 141 transitions. [2022-12-14 12:15:40,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.206896551724138) internal successors, (70), 58 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:15:40,633 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 141 transitions. [2022-12-14 12:15:40,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-12-14 12:15:40,633 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:15:40,634 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:15:40,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-12-14 12:15:40,834 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:15:40,835 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:15:40,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:15:40,836 INFO L85 PathProgramCache]: Analyzing trace with hash 2079281258, now seen corresponding path program 50 times [2022-12-14 12:15:40,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:15:40,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943611157] [2022-12-14 12:15:40,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:15:40,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:15:40,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:15:41,415 INFO L134 CoverageAnalysis]: Checked inductivity of 801 backedges. 136 proven. 188 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2022-12-14 12:15:41,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:15:41,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943611157] [2022-12-14 12:15:41,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943611157] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:15:41,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72083239] [2022-12-14 12:15:41,415 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:15:41,415 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:15:41,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:15:41,416 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:15:41,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-12-14 12:15:41,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-12-14 12:15:41,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:15:41,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 12:15:41,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:15:42,177 INFO L134 CoverageAnalysis]: Checked inductivity of 801 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2022-12-14 12:15:42,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:15:42,571 INFO L134 CoverageAnalysis]: Checked inductivity of 801 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2022-12-14 12:15:42,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72083239] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:15:42,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [701232654] [2022-12-14 12:15:42,572 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:15:42,572 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:15:42,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:15:42,572 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:15:42,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:15:42,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:15:42,593 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 12:15:42,593 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 12:15:42,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:15:42,598 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 [2022-12-14 12:15:42,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:15:42,610 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 31 treesize of output 33 [2022-12-14 12:15:42,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:15:42,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:15:42,648 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 12:15:42,648 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 244 treesize of output 232 [2022-12-14 12:15:42,677 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 16 treesize of output 12 [2022-12-14 12:15:42,735 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:15:43,651 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39433#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:15:43,651 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:15:43,651 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:15:43,651 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 59 [2022-12-14 12:15:43,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374279794] [2022-12-14 12:15:43,651 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:15:43,652 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-12-14 12:15:43,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:15:43,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-12-14 12:15:43,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=821, Invalid=3211, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 12:15:43,653 INFO L87 Difference]: Start difference. First operand 134 states and 141 transitions. Second operand has 59 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:15:44,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:15:44,173 INFO L93 Difference]: Finished difference Result 177 states and 189 transitions. [2022-12-14 12:15:44,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 12:15:44,174 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2022-12-14 12:15:44,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:15:44,174 INFO L225 Difference]: With dead ends: 177 [2022-12-14 12:15:44,174 INFO L226 Difference]: Without dead ends: 100 [2022-12-14 12:15:44,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 191 SyntacticMatches, 72 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5919 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1734, Invalid=5072, Unknown=0, NotChecked=0, Total=6806 [2022-12-14 12:15:44,175 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 211 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 228 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 228 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:15:44,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 23 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [228 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:15:44,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-12-14 12:15:44,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2022-12-14 12:15:44,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.0505050505050506) internal successors, (104), 99 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:15:44,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2022-12-14 12:15:44,237 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 96 [2022-12-14 12:15:44,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:15:44,237 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2022-12-14 12:15:44,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:15:44,237 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2022-12-14 12:15:44,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-12-14 12:15:44,238 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:15:44,238 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:15:44,244 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2022-12-14 12:15:44,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:15:44,439 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:15:44,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:15:44,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1805635847, now seen corresponding path program 51 times [2022-12-14 12:15:44,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:15:44,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615384681] [2022-12-14 12:15:44,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:15:44,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:15:44,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:16:14,254 INFO L134 CoverageAnalysis]: Checked inductivity of 855 backedges. 0 proven. 855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:16:14,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:16:14,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615384681] [2022-12-14 12:16:14,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [615384681] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:16:14,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624060567] [2022-12-14 12:16:14,254 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:16:14,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:16:14,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:16:14,255 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:16:14,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc6b110d-e479-4cdf-bef1-b6d05791890b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-12-14 12:16:14,404 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:16:14,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:16:14,410 WARN L261 TraceCheckSpWp]: Trace formula consists of 586 conjuncts, 338 conjunts are in the unsatisfiable core [2022-12-14 12:16:14,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:16:14,634 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 15 treesize of output 11