./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b 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_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS --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 1be1405ed24182ea691f06aafa4c0ada74bba78ab2a6f90fefc65156bb70df6c --- 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-8393723 [2022-11-19 07:03:56,319 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 07:03:56,322 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 07:03:56,376 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 07:03:56,379 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 07:03:56,384 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 07:03:56,386 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 07:03:56,392 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 07:03:56,394 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 07:03:56,400 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 07:03:56,402 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 07:03:56,404 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 07:03:56,406 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 07:03:56,409 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 07:03:56,411 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 07:03:56,413 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 07:03:56,415 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 07:03:56,419 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 07:03:56,422 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 07:03:56,427 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 07:03:56,433 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 07:03:56,441 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 07:03:56,443 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 07:03:56,444 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 07:03:56,449 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 07:03:56,455 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 07:03:56,456 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 07:03:56,457 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 07:03:56,457 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 07:03:56,460 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 07:03:56,460 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 07:03:56,461 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 07:03:56,463 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 07:03:56,465 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 07:03:56,467 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 07:03:56,468 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 07:03:56,469 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 07:03:56,469 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 07:03:56,469 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 07:03:56,470 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 07:03:56,471 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 07:03:56,472 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 07:03:56,516 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 07:03:56,517 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 07:03:56,518 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 07:03:56,518 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 07:03:56,519 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 07:03:56,519 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 07:03:56,519 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 07:03:56,520 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 07:03:56,520 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 07:03:56,520 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 07:03:56,521 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 07:03:56,522 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 07:03:56,522 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 07:03:56,522 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 07:03:56,522 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 07:03:56,522 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 07:03:56,523 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 07:03:56,523 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 07:03:56,524 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 07:03:56,524 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 07:03:56,524 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 07:03:56,524 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 07:03:56,525 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 07:03:56,525 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 07:03:56,525 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 07:03:56,525 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 07:03:56,525 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 07:03:56,526 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 07:03:56,526 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 07:03:56,526 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 07:03:56,526 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 07:03:56,527 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 07:03:56,527 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:03:56,527 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 07:03:56,528 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 07:03:56,528 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 07:03:56,528 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 07:03:56,528 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 07:03:56,528 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 07:03:56,529 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 07:03:56,529 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 07:03:56,529 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_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1be1405ed24182ea691f06aafa4c0ada74bba78ab2a6f90fefc65156bb70df6c [2022-11-19 07:03:56,855 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 07:03:56,883 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 07:03:56,886 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 07:03:56,888 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 07:03:56,889 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 07:03:56,891 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/array-crafted/zero_sum_const2.c [2022-11-19 07:03:56,980 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/data/efe9f8bd2/340a1a760c424048bc9111b6c76e936a/FLAG9708fcc3b [2022-11-19 07:03:57,504 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 07:03:57,505 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/sv-benchmarks/c/array-crafted/zero_sum_const2.c [2022-11-19 07:03:57,511 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/data/efe9f8bd2/340a1a760c424048bc9111b6c76e936a/FLAG9708fcc3b [2022-11-19 07:03:57,852 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/data/efe9f8bd2/340a1a760c424048bc9111b6c76e936a [2022-11-19 07:03:57,856 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 07:03:57,860 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 07:03:57,871 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 07:03:57,872 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 07:03:57,876 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 07:03:57,877 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:03:57" (1/1) ... [2022-11-19 07:03:57,879 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@689ed3a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:57, skipping insertion in model container [2022-11-19 07:03:57,879 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:03:57" (1/1) ... [2022-11-19 07:03:57,889 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 07:03:57,907 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 07:03:58,123 WARN L234 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_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/sv-benchmarks/c/array-crafted/zero_sum_const2.c[406,419] [2022-11-19 07:03:58,144 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:03:58,153 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 07:03:58,168 WARN L234 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_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/sv-benchmarks/c/array-crafted/zero_sum_const2.c[406,419] [2022-11-19 07:03:58,177 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:03:58,195 INFO L208 MainTranslator]: Completed translation [2022-11-19 07:03:58,195 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58 WrapperNode [2022-11-19 07:03:58,196 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 07:03:58,197 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 07:03:58,197 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 07:03:58,198 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 07:03:58,208 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,217 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,236 INFO L138 Inliner]: procedures = 16, calls = 14, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 82 [2022-11-19 07:03:58,237 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 07:03:58,238 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 07:03:58,238 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 07:03:58,238 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 07:03:58,250 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,251 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,253 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,254 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,259 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,265 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,266 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,268 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,276 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 07:03:58,278 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 07:03:58,278 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 07:03:58,278 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 07:03:58,279 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (1/1) ... [2022-11-19 07:03:58,301 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:03:58,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:03:58,343 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 07:03:58,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 07:03:58,423 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 07:03:58,423 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 07:03:58,424 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-19 07:03:58,424 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-19 07:03:58,424 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 07:03:58,424 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 07:03:58,424 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-19 07:03:58,526 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 07:03:58,528 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 07:03:58,738 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 07:03:58,851 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 07:03:58,867 INFO L300 CfgBuilder]: Removed 5 assume(true) statements. [2022-11-19 07:03:58,870 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:03:58 BoogieIcfgContainer [2022-11-19 07:03:58,870 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 07:03:58,874 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 07:03:58,874 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 07:03:58,880 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 07:03:58,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:03:57" (1/3) ... [2022-11-19 07:03:58,881 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1fea494e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:03:58, skipping insertion in model container [2022-11-19 07:03:58,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:03:58" (2/3) ... [2022-11-19 07:03:58,882 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1fea494e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:03:58, skipping insertion in model container [2022-11-19 07:03:58,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:03:58" (3/3) ... [2022-11-19 07:03:58,884 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const2.c [2022-11-19 07:03:58,909 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 07:03:58,909 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 07:03:58,973 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 07:03:58,983 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;@ab1b64a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 07:03:58,984 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 07:03:58,989 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) [2022-11-19 07:03:58,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 07:03:58,998 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:03:58,999 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:03:59,000 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:03:59,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:03:59,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1853536887, now seen corresponding path program 1 times [2022-11-19 07:03:59,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:03:59,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [446762353] [2022-11-19 07:03:59,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:03:59,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:03:59,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:03:59,320 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:03:59,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:03:59,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [446762353] [2022-11-19 07:03:59,323 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [446762353] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:03:59,323 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:03:59,323 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 07:03:59,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211811567] [2022-11-19 07:03:59,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:03:59,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 07:03:59,338 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:03:59,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 07:03:59,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:03:59,404 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) [2022-11-19 07:03:59,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:03:59,532 INFO L93 Difference]: Finished difference Result 24 states and 35 transitions. [2022-11-19 07:03:59,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 07:03:59,538 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 [2022-11-19 07:03:59,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:03:59,548 INFO L225 Difference]: With dead ends: 24 [2022-11-19 07:03:59,550 INFO L226 Difference]: Without dead ends: 11 [2022-11-19 07:03:59,555 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 [2022-11-19 07:03:59,563 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:03:59,574 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:03:59,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-11-19 07:03:59,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-11-19 07:03:59,615 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) [2022-11-19 07:03:59,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 15 transitions. [2022-11-19 07:03:59,617 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 15 transitions. Word has length 9 [2022-11-19 07:03:59,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:03:59,618 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 15 transitions. [2022-11-19 07:03:59,618 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) [2022-11-19 07:03:59,619 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 15 transitions. [2022-11-19 07:03:59,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-19 07:03:59,619 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:03:59,619 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:03:59,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 07:03:59,620 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:03:59,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:03:59,621 INFO L85 PathProgramCache]: Analyzing trace with hash -288493454, now seen corresponding path program 1 times [2022-11-19 07:03:59,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:03:59,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895020094] [2022-11-19 07:03:59,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:03:59,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:03:59,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:03:59,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:03:59,788 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:03:59,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895020094] [2022-11-19 07:03:59,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [895020094] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:03:59,789 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:03:59,789 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 07:03:59,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14976880] [2022-11-19 07:03:59,790 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:03:59,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:03:59,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:03:59,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:03:59,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:03:59,793 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) [2022-11-19 07:03:59,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:03:59,877 INFO L93 Difference]: Finished difference Result 21 states and 31 transitions. [2022-11-19 07:03:59,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:03:59,878 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 [2022-11-19 07:03:59,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:03:59,879 INFO L225 Difference]: With dead ends: 21 [2022-11-19 07:03:59,879 INFO L226 Difference]: Without dead ends: 15 [2022-11-19 07:03:59,879 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 [2022-11-19 07:03:59,881 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:03:59,882 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 5 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:03:59,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-19 07:03:59,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-19 07:03:59,889 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) [2022-11-19 07:03:59,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2022-11-19 07:03:59,890 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 10 [2022-11-19 07:03:59,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:03:59,891 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2022-11-19 07:03:59,891 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) [2022-11-19 07:03:59,891 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2022-11-19 07:03:59,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 07:03:59,892 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:03:59,892 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:03:59,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 07:03:59,893 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:03:59,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:03:59,894 INFO L85 PathProgramCache]: Analyzing trace with hash -918811174, now seen corresponding path program 1 times [2022-11-19 07:03:59,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:03:59,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296066399] [2022-11-19 07:03:59,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:03:59,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:03:59,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:00,233 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:04:00,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:00,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296066399] [2022-11-19 07:04:00,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296066399] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:00,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959826527] [2022-11-19 07:04:00,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:00,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:00,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:00,242 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:00,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 07:04:00,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:00,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 07:04:00,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:00,460 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:04:00,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:00,494 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:04:00,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959826527] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:00,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1965142176] [2022-11-19 07:04:00,521 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:00,521 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:00,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:00,533 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:00,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:00,730 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:00,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:00,763 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:04:00,821 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 [2022-11-19 07:04:00,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:01,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:01,026 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:04:01,027 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 250 treesize of output 247 [2022-11-19 07:04:01,203 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 [2022-11-19 07:04:01,522 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:01,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '220#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:01,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:01,942 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:01,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-19 07:04:01,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776372415] [2022-11-19 07:04:01,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:01,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 07:04:01,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:01,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 07:04:01,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-19 07:04:01,952 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) [2022-11-19 07:04:02,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:02,023 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2022-11-19 07:04:02,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:04:02,025 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 [2022-11-19 07:04:02,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:02,026 INFO L225 Difference]: With dead ends: 27 [2022-11-19 07:04:02,027 INFO L226 Difference]: Without dead ends: 16 [2022-11-19 07:04:02,028 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 27 SyntacticMatches, 7 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-19 07:04:02,032 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:02,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:04:02,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-19 07:04:02,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-19 07:04:02,051 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) [2022-11-19 07:04:02,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-19 07:04:02,052 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 14 [2022-11-19 07:04:02,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:02,052 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-19 07:04:02,053 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) [2022-11-19 07:04:02,053 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-19 07:04:02,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-19 07:04:02,054 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:02,054 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:02,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 07:04:02,263 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:02,264 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:02,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:02,265 INFO L85 PathProgramCache]: Analyzing trace with hash 510053521, now seen corresponding path program 2 times [2022-11-19 07:04:02,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:02,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973891598] [2022-11-19 07:04:02,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:02,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:02,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:02,410 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 07:04:02,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:02,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973891598] [2022-11-19 07:04:02,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973891598] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:02,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366685430] [2022-11-19 07:04:02,411 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:04:02,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:02,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:02,413 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:02,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 07:04:02,501 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-19 07:04:02,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:04:02,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 07:04:02,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:02,550 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 07:04:02,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:02,584 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 07:04:02,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366685430] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:02,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [553408764] [2022-11-19 07:04:02,593 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:02,593 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:02,594 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:02,594 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:02,594 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:02,701 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:02,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:02,722 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:04:02,762 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 [2022-11-19 07:04:02,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:02,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:02,894 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:04:02,895 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 250 treesize of output 247 [2022-11-19 07:04:02,978 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 [2022-11-19 07:04:03,139 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:03,430 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '390#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:03,430 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:03,430 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:03,430 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-11-19 07:04:03,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363061405] [2022-11-19 07:04:03,431 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:03,431 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-19 07:04:03,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:03,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-19 07:04:03,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-11-19 07:04:03,432 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) [2022-11-19 07:04:03,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:03,543 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2022-11-19 07:04:03,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 07:04:03,544 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 [2022-11-19 07:04:03,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:03,545 INFO L225 Difference]: With dead ends: 29 [2022-11-19 07:04:03,545 INFO L226 Difference]: Without dead ends: 20 [2022-11-19 07:04:03,546 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-11-19 07:04:03,547 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:03,547 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 7 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:04:03,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-19 07:04:03,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-19 07:04:03,552 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) [2022-11-19 07:04:03,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-11-19 07:04:03,553 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 15 [2022-11-19 07:04:03,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:03,553 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-11-19 07:04:03,553 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) [2022-11-19 07:04:03,553 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-11-19 07:04:03,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-19 07:04:03,554 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:03,554 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:03,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 07:04:03,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:03,761 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:03,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:03,762 INFO L85 PathProgramCache]: Analyzing trace with hash -869134615, now seen corresponding path program 3 times [2022-11-19 07:04:03,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:03,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355421487] [2022-11-19 07:04:03,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:03,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:03,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:05,615 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:04:05,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:05,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355421487] [2022-11-19 07:04:05,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355421487] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:05,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058273591] [2022-11-19 07:04:05,617 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:04:05,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:05,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:05,618 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:05,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 07:04:05,697 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:04:05,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:04:05,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-19 07:04:05,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:06,033 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 07:04:06,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:06,389 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:04:06,390 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 51 [2022-11-19 07:04:06,510 INFO L321 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2022-11-19 07:04:06,510 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 18 [2022-11-19 07:04:06,563 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 07:04:06,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058273591] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:06,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1375041445] [2022-11-19 07:04:06,567 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:06,567 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:06,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:06,568 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:06,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:06,641 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:04:06,641 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:04:06,713 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:06,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:06,752 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 [2022-11-19 07:04:06,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:06,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:06,877 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:04:06,878 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 250 treesize of output 247 [2022-11-19 07:04:06,933 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 [2022-11-19 07:04:07,069 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:07,467 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '613#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:07,467 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:07,467 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:07,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 10] total 25 [2022-11-19 07:04:07,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910832602] [2022-11-19 07:04:07,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:07,468 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-19 07:04:07,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:07,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-19 07:04:07,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=772, Unknown=0, NotChecked=0, Total=870 [2022-11-19 07:04:07,470 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 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) [2022-11-19 07:04:07,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:07,878 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2022-11-19 07:04:07,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 07:04:07,879 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 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 19 [2022-11-19 07:04:07,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:07,880 INFO L225 Difference]: With dead ends: 33 [2022-11-19 07:04:07,880 INFO L226 Difference]: Without dead ends: 30 [2022-11-19 07:04:07,881 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 39 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 07:04:07,881 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:07,882 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 21 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:04:07,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-19 07:04:07,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2022-11-19 07:04:07,890 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) [2022-11-19 07:04:07,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2022-11-19 07:04:07,891 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 19 [2022-11-19 07:04:07,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:07,891 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2022-11-19 07:04:07,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 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) [2022-11-19 07:04:07,892 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2022-11-19 07:04:07,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-19 07:04:07,893 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:07,893 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:07,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 07:04:08,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:08,100 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:08,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:08,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1056486243, now seen corresponding path program 4 times [2022-11-19 07:04:08,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:08,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033760564] [2022-11-19 07:04:08,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:08,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:08,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:08,245 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 07:04:08,249 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:08,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033760564] [2022-11-19 07:04:08,249 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033760564] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:08,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087128515] [2022-11-19 07:04:08,250 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:04:08,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:08,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:08,252 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:08,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 07:04:08,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:08,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 07:04:08,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:08,417 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 07:04:08,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:08,474 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 07:04:08,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087128515] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:08,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368286590] [2022-11-19 07:04:08,477 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:08,478 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:08,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:08,478 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:08,479 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:08,554 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:04:08,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:04:08,631 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:08,631 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:08,662 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 [2022-11-19 07:04:08,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:08,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:08,777 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:04:08,778 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 250 treesize of output 247 [2022-11-19 07:04:08,839 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 [2022-11-19 07:04:08,977 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:09,222 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '860#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:09,222 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:09,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:09,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-11-19 07:04:09,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695393593] [2022-11-19 07:04:09,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:09,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 07:04:09,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:09,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 07:04:09,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2022-11-19 07:04:09,225 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) [2022-11-19 07:04:09,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:09,453 INFO L93 Difference]: Finished difference Result 62 states and 77 transitions. [2022-11-19 07:04:09,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-19 07:04:09,454 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 [2022-11-19 07:04:09,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:09,455 INFO L225 Difference]: With dead ends: 62 [2022-11-19 07:04:09,455 INFO L226 Difference]: Without dead ends: 37 [2022-11-19 07:04:09,456 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2022-11-19 07:04:09,460 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:09,461 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 9 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:04:09,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-19 07:04:09,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2022-11-19 07:04:09,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2022-11-19 07:04:09,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2022-11-19 07:04:09,479 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 20 [2022-11-19 07:04:09,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:09,479 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2022-11-19 07:04:09,480 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) [2022-11-19 07:04:09,480 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2022-11-19 07:04:09,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-19 07:04:09,481 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:09,482 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:09,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 07:04:09,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 07:04:09,689 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:09,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:09,689 INFO L85 PathProgramCache]: Analyzing trace with hash -1086331372, now seen corresponding path program 5 times [2022-11-19 07:04:09,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:09,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479111578] [2022-11-19 07:04:09,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:09,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:09,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:09,888 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:04:09,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:09,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479111578] [2022-11-19 07:04:09,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479111578] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:09,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623770020] [2022-11-19 07:04:09,890 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:04:09,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:09,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:09,892 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:09,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 07:04:09,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 07:04:09,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:04:09,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 07:04:09,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:10,111 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:04:10,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:10,223 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:04:10,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623770020] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:10,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2062733664] [2022-11-19 07:04:10,227 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:10,227 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:10,228 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:10,228 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:10,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:10,302 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:04:10,303 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:04:10,377 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:10,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:10,423 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 [2022-11-19 07:04:10,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:10,496 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:04:10,525 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:04:10,526 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 245 treesize of output 248 [2022-11-19 07:04:10,634 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 16 treesize of output 12 [2022-11-19 07:04:10,788 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:11,226 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1170#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:11,226 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:11,226 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:11,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-19 07:04:11,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006666514] [2022-11-19 07:04:11,227 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:11,227 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 07:04:11,227 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:11,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 07:04:11,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-11-19 07:04:11,229 INFO L87 Difference]: Start difference. First operand 30 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) [2022-11-19 07:04:11,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:11,431 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2022-11-19 07:04:11,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 07:04:11,432 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 [2022-11-19 07:04:11,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:11,432 INFO L225 Difference]: With dead ends: 34 [2022-11-19 07:04:11,433 INFO L226 Difference]: Without dead ends: 25 [2022-11-19 07:04:11,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 38 SyntacticMatches, 15 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2022-11-19 07:04:11,434 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:11,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 7 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:04:11,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-19 07:04:11,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-19 07:04:11,441 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) [2022-11-19 07:04:11,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2022-11-19 07:04:11,442 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 21 [2022-11-19 07:04:11,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:11,442 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2022-11-19 07:04:11,442 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) [2022-11-19 07:04:11,443 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2022-11-19 07:04:11,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-19 07:04:11,443 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:11,444 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:11,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 07:04:11,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:11,660 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:11,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:11,660 INFO L85 PathProgramCache]: Analyzing trace with hash 1278953466, now seen corresponding path program 6 times [2022-11-19 07:04:11,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:11,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030259443] [2022-11-19 07:04:11,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:11,661 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:11,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:14,760 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:04:14,760 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:14,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030259443] [2022-11-19 07:04:14,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030259443] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:14,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312968095] [2022-11-19 07:04:14,761 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:04:14,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:14,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:14,764 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:14,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 07:04:14,864 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:04:14,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:04:14,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-19 07:04:14,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:15,867 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 07:04:15,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:16,969 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:04:16,969 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2022-11-19 07:04:17,295 INFO L321 Elim1Store]: treesize reduction 84, result has 13.4 percent of original size [2022-11-19 07:04:17,302 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2022-11-19 07:04:17,521 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 07:04:17,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312968095] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:17,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1979097913] [2022-11-19 07:04:17,524 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:17,524 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:17,525 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:17,525 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:17,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:17,603 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:17,604 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:17,647 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:04:17,673 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 [2022-11-19 07:04:17,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:17,731 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:04:17,764 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:04:17,764 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 245 treesize of output 248 [2022-11-19 07:04:17,881 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 [2022-11-19 07:04:18,005 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:18,558 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1473#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:18,558 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:18,558 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:18,558 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 14, 16] total 45 [2022-11-19 07:04:18,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868233761] [2022-11-19 07:04:18,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:18,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-19 07:04:18,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:18,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-19 07:04:18,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=2254, Unknown=0, NotChecked=0, Total=2450 [2022-11-19 07:04:18,561 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 45 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 45 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) [2022-11-19 07:04:22,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:22,008 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2022-11-19 07:04:22,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-19 07:04:22,009 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 45 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 24 [2022-11-19 07:04:22,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:22,010 INFO L225 Difference]: With dead ends: 47 [2022-11-19 07:04:22,010 INFO L226 Difference]: Without dead ends: 44 [2022-11-19 07:04:22,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 39 SyntacticMatches, 6 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=432, Invalid=4260, Unknown=0, NotChecked=0, Total=4692 [2022-11-19 07:04:22,013 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 19 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 746 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:22,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 82 Invalid, 746 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 620 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 07:04:22,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-19 07:04:22,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 35. [2022-11-19 07:04:22,026 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) [2022-11-19 07:04:22,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-11-19 07:04:22,026 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 24 [2022-11-19 07:04:22,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:22,027 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-11-19 07:04:22,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 45 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) [2022-11-19 07:04:22,027 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-11-19 07:04:22,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-19 07:04:22,028 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:22,028 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:22,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 07:04:22,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:22,235 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:22,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:22,236 INFO L85 PathProgramCache]: Analyzing trace with hash -866602372, now seen corresponding path program 7 times [2022-11-19 07:04:22,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:22,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299310150] [2022-11-19 07:04:22,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:22,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:22,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:22,390 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-19 07:04:22,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:22,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299310150] [2022-11-19 07:04:22,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299310150] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:22,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1653725367] [2022-11-19 07:04:22,391 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:04:22,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:22,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:22,396 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:22,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 07:04:22,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:22,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-19 07:04:22,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:22,593 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-19 07:04:22,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:22,675 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-19 07:04:22,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1653725367] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:22,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [410335408] [2022-11-19 07:04:22,677 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:22,677 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:22,678 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:22,678 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:22,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:22,758 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:04:22,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:04:22,836 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:22,837 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:22,873 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 [2022-11-19 07:04:22,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:22,942 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:04:22,972 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:04:22,973 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 245 treesize of output 248 [2022-11-19 07:04:23,052 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 [2022-11-19 07:04:23,175 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:23,794 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1824#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:23,795 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:23,795 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:23,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-11-19 07:04:23,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690037147] [2022-11-19 07:04:23,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:23,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-19 07:04:23,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:23,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-19 07:04:23,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2022-11-19 07:04:23,797 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) [2022-11-19 07:04:24,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:24,077 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2022-11-19 07:04:24,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 07:04:24,078 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 [2022-11-19 07:04:24,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:24,078 INFO L225 Difference]: With dead ends: 76 [2022-11-19 07:04:24,079 INFO L226 Difference]: Without dead ends: 44 [2022-11-19 07:04:24,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 45 SyntacticMatches, 19 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2022-11-19 07:04:24,080 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 36 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:24,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 13 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:04:24,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-19 07:04:24,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2022-11-19 07:04:24,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 36 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) [2022-11-19 07:04:24,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2022-11-19 07:04:24,095 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 25 [2022-11-19 07:04:24,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:24,095 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2022-11-19 07:04:24,096 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) [2022-11-19 07:04:24,096 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2022-11-19 07:04:24,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 07:04:24,097 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:24,097 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:24,113 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-19 07:04:24,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:24,304 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:24,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:24,305 INFO L85 PathProgramCache]: Analyzing trace with hash -777491611, now seen corresponding path program 8 times [2022-11-19 07:04:24,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:24,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459414888] [2022-11-19 07:04:24,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:24,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:24,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:24,476 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-19 07:04:24,476 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:24,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459414888] [2022-11-19 07:04:24,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459414888] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:24,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216638035] [2022-11-19 07:04:24,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:04:24,478 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:24,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:24,480 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:24,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 07:04:24,578 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 07:04:24,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:04:24,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-19 07:04:24,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:24,686 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-19 07:04:24,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:24,803 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-19 07:04:24,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216638035] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:24,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [64847974] [2022-11-19 07:04:24,807 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:24,807 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:24,808 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:24,808 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:24,808 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:24,891 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:04:24,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:04:24,971 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:24,972 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:25,002 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 [2022-11-19 07:04:25,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:25,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:25,092 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:04:25,092 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 250 treesize of output 247 [2022-11-19 07:04:25,151 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 [2022-11-19 07:04:25,272 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:25,804 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2211#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:25,804 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:25,804 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:25,804 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-11-19 07:04:25,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683960060] [2022-11-19 07:04:25,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:25,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-19 07:04:25,806 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:25,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-19 07:04:25,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2022-11-19 07:04:25,807 INFO L87 Difference]: Start difference. First operand 37 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) [2022-11-19 07:04:26,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:26,070 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2022-11-19 07:04:26,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 07:04:26,073 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 [2022-11-19 07:04:26,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:26,073 INFO L225 Difference]: With dead ends: 41 [2022-11-19 07:04:26,073 INFO L226 Difference]: Without dead ends: 30 [2022-11-19 07:04:26,074 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 47 SyntacticMatches, 20 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=148, Invalid=608, Unknown=0, NotChecked=0, Total=756 [2022-11-19 07:04:26,075 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:26,075 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 9 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:04:26,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-19 07:04:26,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-19 07:04:26,086 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) [2022-11-19 07:04:26,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-11-19 07:04:26,087 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 26 [2022-11-19 07:04:26,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:26,087 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-11-19 07:04:26,088 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) [2022-11-19 07:04:26,088 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-11-19 07:04:26,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-19 07:04:26,089 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:26,089 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:26,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 07:04:26,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 07:04:26,296 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:26,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:26,296 INFO L85 PathProgramCache]: Analyzing trace with hash -1967427511, now seen corresponding path program 9 times [2022-11-19 07:04:26,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:26,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213554449] [2022-11-19 07:04:26,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:26,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:26,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:29,781 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:04:29,782 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:29,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213554449] [2022-11-19 07:04:29,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213554449] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:29,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527697264] [2022-11-19 07:04:29,782 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:04:29,782 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:29,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:29,783 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:29,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 07:04:29,876 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:04:29,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:04:29,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 83 conjunts are in the unsatisfiable core [2022-11-19 07:04:29,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:31,084 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 07:04:31,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:32,700 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:04:32,700 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 185 [2022-11-19 07:04:33,377 INFO L321 Elim1Store]: treesize reduction 156, result has 9.8 percent of original size [2022-11-19 07:04:33,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 30 [2022-11-19 07:04:33,713 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 07:04:33,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527697264] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:33,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [565752223] [2022-11-19 07:04:33,715 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:33,716 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:33,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:33,716 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:33,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:33,792 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:33,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:33,811 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 [2022-11-19 07:04:33,840 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 [2022-11-19 07:04:33,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:33,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:33,920 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:04:33,920 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 250 treesize of output 247 [2022-11-19 07:04:33,981 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 [2022-11-19 07:04:34,107 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:35,955 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2581#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:35,955 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:35,955 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:35,955 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 16, 20] total 56 [2022-11-19 07:04:35,955 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685611264] [2022-11-19 07:04:35,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:35,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-19 07:04:35,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:35,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-19 07:04:35,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=3353, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 07:04:35,959 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 56 states, 56 states have (on average 1.3928571428571428) internal successors, (78), 56 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) [2022-11-19 07:04:41,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:41,868 INFO L93 Difference]: Finished difference Result 72 states and 85 transitions. [2022-11-19 07:04:41,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-19 07:04:41,869 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.3928571428571428) internal successors, (78), 56 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) Word has length 29 [2022-11-19 07:04:41,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:41,870 INFO L225 Difference]: With dead ends: 72 [2022-11-19 07:04:41,870 INFO L226 Difference]: Without dead ends: 68 [2022-11-19 07:04:41,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 32 SyntacticMatches, 22 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2722 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=797, Invalid=7575, Unknown=0, NotChecked=0, Total=8372 [2022-11-19 07:04:41,873 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 26 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 1139 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 1298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 1139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:41,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 121 Invalid, 1298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 1139 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-19 07:04:41,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-19 07:04:41,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 44. [2022-11-19 07:04:41,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 43 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:04:41,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2022-11-19 07:04:41,903 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 29 [2022-11-19 07:04:41,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:41,904 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2022-11-19 07:04:41,905 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.3928571428571428) internal successors, (78), 56 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) [2022-11-19 07:04:41,905 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2022-11-19 07:04:41,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-19 07:04:41,906 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:41,906 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:41,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 07:04:42,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-19 07:04:42,115 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:42,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:42,115 INFO L85 PathProgramCache]: Analyzing trace with hash 271791705, now seen corresponding path program 10 times [2022-11-19 07:04:42,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:42,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074574912] [2022-11-19 07:04:42,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:42,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:42,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:42,284 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-19 07:04:42,284 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:42,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074574912] [2022-11-19 07:04:42,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074574912] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:42,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841674153] [2022-11-19 07:04:42,285 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:04:42,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:42,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:42,287 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:42,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 07:04:42,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:42,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 07:04:42,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:42,530 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-19 07:04:42,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:42,658 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-19 07:04:42,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841674153] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:42,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1672774597] [2022-11-19 07:04:42,660 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:42,660 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:42,660 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:42,661 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:42,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:42,735 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:42,735 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:42,751 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:04:42,773 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 [2022-11-19 07:04:42,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:42,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:42,859 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:04:42,860 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 250 treesize of output 247 [2022-11-19 07:04:42,935 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 [2022-11-19 07:04:43,052 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:43,643 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3057#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:43,644 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:43,644 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:43,644 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-19 07:04:43,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663144934] [2022-11-19 07:04:43,644 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:43,645 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 07:04:43,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:43,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 07:04:43,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2022-11-19 07:04:43,646 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 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) [2022-11-19 07:04:43,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:43,967 INFO L93 Difference]: Finished difference Result 109 states and 130 transitions. [2022-11-19 07:04:43,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-19 07:04:43,969 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 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 [2022-11-19 07:04:43,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:43,969 INFO L225 Difference]: With dead ends: 109 [2022-11-19 07:04:43,970 INFO L226 Difference]: Without dead ends: 57 [2022-11-19 07:04:43,970 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 52 SyntacticMatches, 26 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2022-11-19 07:04:43,971 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:43,972 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 15 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:04:43,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-19 07:04:43,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 50. [2022-11-19 07:04:43,997 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) [2022-11-19 07:04:43,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2022-11-19 07:04:43,998 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 30 [2022-11-19 07:04:43,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:43,999 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2022-11-19 07:04:43,999 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 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) [2022-11-19 07:04:43,999 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2022-11-19 07:04:44,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-19 07:04:44,000 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:44,000 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:44,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 07:04:44,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:44,206 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:44,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:44,207 INFO L85 PathProgramCache]: Analyzing trace with hash -302676750, now seen corresponding path program 11 times [2022-11-19 07:04:44,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:44,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047055558] [2022-11-19 07:04:44,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:44,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:44,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:44,419 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-19 07:04:44,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:44,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047055558] [2022-11-19 07:04:44,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2047055558] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:44,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224220180] [2022-11-19 07:04:44,420 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:04:44,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:44,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:44,422 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:44,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 07:04:44,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 07:04:44,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:04:44,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 07:04:44,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:44,688 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-19 07:04:44,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:44,816 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-19 07:04:44,817 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224220180] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:44,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1421187420] [2022-11-19 07:04:44,819 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:44,819 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:44,819 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:44,820 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:44,820 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:44,907 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:04:44,908 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:04:44,980 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:44,980 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:45,013 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 [2022-11-19 07:04:45,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:45,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:45,084 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:04:45,085 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 250 treesize of output 247 [2022-11-19 07:04:45,142 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 16 treesize of output 12 [2022-11-19 07:04:45,268 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:45,814 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3577#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:45,814 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:45,815 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:45,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-19 07:04:45,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323168293] [2022-11-19 07:04:45,815 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:45,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 07:04:45,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:45,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 07:04:45,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2022-11-19 07:04:45,816 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 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) [2022-11-19 07:04:46,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:04:46,106 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2022-11-19 07:04:46,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 07:04:46,107 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 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 32 [2022-11-19 07:04:46,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:04:46,107 INFO L225 Difference]: With dead ends: 54 [2022-11-19 07:04:46,107 INFO L226 Difference]: Without dead ends: 41 [2022-11-19 07:04:46,108 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 59 SyntacticMatches, 25 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2022-11-19 07:04:46,109 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:04:46,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 13 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:04:46,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-19 07:04:46,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 35. [2022-11-19 07:04:46,129 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) [2022-11-19 07:04:46,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2022-11-19 07:04:46,129 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 32 [2022-11-19 07:04:46,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:04:46,130 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2022-11-19 07:04:46,130 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 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) [2022-11-19 07:04:46,130 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2022-11-19 07:04:46,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-19 07:04:46,131 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:04:46,131 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:04:46,139 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-19 07:04:46,337 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:46,337 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:04:46,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:04:46,338 INFO L85 PathProgramCache]: Analyzing trace with hash 1803528730, now seen corresponding path program 12 times [2022-11-19 07:04:46,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:04:46,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1400682443] [2022-11-19 07:04:46,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:04:46,339 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:04:46,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:04:51,879 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 3 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:04:51,880 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:51,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1400682443] [2022-11-19 07:04:51,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1400682443] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:04:51,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965634596] [2022-11-19 07:04:51,880 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:04:51,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:04:51,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:04:51,881 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:04:51,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 07:04:51,994 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:04:51,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:04:51,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 90 conjunts are in the unsatisfiable core [2022-11-19 07:04:52,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:04:53,316 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-19 07:04:53,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:04:54,837 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:04:54,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 285 [2022-11-19 07:04:56,787 INFO L321 Elim1Store]: treesize reduction 250, result has 7.7 percent of original size [2022-11-19 07:04:56,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 36 [2022-11-19 07:04:56,885 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-19 07:04:56,886 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965634596] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:56,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1951333750] [2022-11-19 07:04:56,888 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:04:56,888 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:56,888 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:56,889 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:56,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:56,957 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:04:56,957 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:04:56,972 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:04:56,993 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 [2022-11-19 07:04:57,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:04:57,060 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:04:57,090 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:04:57,091 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 245 treesize of output 248 [2022-11-19 07:04:57,195 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 [2022-11-19 07:04:57,319 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:59,435 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4016#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:04:59,435 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:59,435 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:04:59,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16, 16] total 57 [2022-11-19 07:04:59,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085466253] [2022-11-19 07:04:59,436 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:59,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-19 07:04:59,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:59,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-19 07:04:59,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=3556, Unknown=0, NotChecked=0, Total=3782 [2022-11-19 07:04:59,439 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 57 states, 57 states have (on average 1.543859649122807) internal successors, (88), 57 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:05:05,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:05:05,511 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2022-11-19 07:05:05,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-19 07:05:05,512 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.543859649122807) internal successors, (88), 57 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-19 07:05:05,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:05:05,513 INFO L225 Difference]: With dead ends: 63 [2022-11-19 07:05:05,513 INFO L226 Difference]: Without dead ends: 60 [2022-11-19 07:05:05,516 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 50 SyntacticMatches, 23 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3130 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=587, Invalid=7785, Unknown=0, NotChecked=0, Total=8372 [2022-11-19 07:05:05,516 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 13 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 1297 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 1412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 1297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:05:05,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 145 Invalid, 1412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 1297 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-19 07:05:05,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-19 07:05:05,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 49. [2022-11-19 07:05:05,551 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) [2022-11-19 07:05:05,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2022-11-19 07:05:05,552 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 34 [2022-11-19 07:05:05,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:05:05,553 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2022-11-19 07:05:05,553 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.543859649122807) internal successors, (88), 57 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:05:05,553 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2022-11-19 07:05:05,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-19 07:05:05,554 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:05:05,554 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:05:05,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 07:05:05,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 07:05:05,761 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:05:05,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:05:05,762 INFO L85 PathProgramCache]: Analyzing trace with hash 721916124, now seen corresponding path program 13 times [2022-11-19 07:05:05,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:05:05,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980845521] [2022-11-19 07:05:05,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:05:05,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:05:05,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:05:05,976 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-19 07:05:05,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:05:05,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980845521] [2022-11-19 07:05:05,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980845521] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:05:05,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268622019] [2022-11-19 07:05:05,977 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:05:05,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:05:05,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:05:05,979 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:05:06,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 07:05:06,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:05:06,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-19 07:05:06,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:05:06,243 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-19 07:05:06,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:05:06,374 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-19 07:05:06,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268622019] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:05:06,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [871401953] [2022-11-19 07:05:06,376 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:05:06,377 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:05:06,377 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:05:06,377 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:05:06,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:05:06,456 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:05:06,457 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:05:06,470 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:05:06,496 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 [2022-11-19 07:05:06,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:05:06,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:05:06,591 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:05:06,592 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 250 treesize of output 247 [2022-11-19 07:05:06,647 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 [2022-11-19 07:05:06,772 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:05:07,580 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4515#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:05:07,580 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:05:07,580 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:05:07,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2022-11-19 07:05:07,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619890993] [2022-11-19 07:05:07,581 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:05:07,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 07:05:07,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:05:07,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 07:05:07,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=554, Unknown=0, NotChecked=0, Total=702 [2022-11-19 07:05:07,583 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) [2022-11-19 07:05:07,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:05:07,998 INFO L93 Difference]: Finished difference Result 104 states and 119 transitions. [2022-11-19 07:05:07,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-19 07:05:07,999 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 [2022-11-19 07:05:07,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:05:07,999 INFO L225 Difference]: With dead ends: 104 [2022-11-19 07:05:08,000 INFO L226 Difference]: Without dead ends: 58 [2022-11-19 07:05:08,001 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 63 SyntacticMatches, 29 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=223, Invalid=833, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 07:05:08,001 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:05:08,002 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 13 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:05:08,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-19 07:05:08,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 51. [2022-11-19 07:05:08,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.14) internal successors, (57), 50 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) [2022-11-19 07:05:08,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2022-11-19 07:05:08,039 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 35 [2022-11-19 07:05:08,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:05:08,040 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2022-11-19 07:05:08,040 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) [2022-11-19 07:05:08,040 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2022-11-19 07:05:08,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-19 07:05:08,041 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:05:08,041 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:05:08,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 07:05:08,248 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 07:05:08,248 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:05:08,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:05:08,249 INFO L85 PathProgramCache]: Analyzing trace with hash -29885819, now seen corresponding path program 14 times [2022-11-19 07:05:08,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:05:08,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128045097] [2022-11-19 07:05:08,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:05:08,249 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:05:08,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:05:08,506 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-19 07:05:08,506 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:05:08,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128045097] [2022-11-19 07:05:08,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128045097] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:05:08,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608027868] [2022-11-19 07:05:08,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:05:08,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:05:08,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:05:08,508 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:05:08,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 07:05:08,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 07:05:08,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:05:08,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-19 07:05:08,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:05:08,827 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-19 07:05:08,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:05:08,994 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-19 07:05:08,995 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [608027868] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:05:08,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [508979709] [2022-11-19 07:05:08,996 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:05:08,997 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:05:08,997 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:05:08,997 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:05:08,997 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:05:09,075 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:05:09,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:05:09,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:05:09,115 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 [2022-11-19 07:05:09,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:05:09,204 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:05:09,233 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:05:09,233 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 245 treesize of output 248 [2022-11-19 07:05:09,298 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 [2022-11-19 07:05:09,412 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:05:10,124 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5056#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:05:10,124 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:05:10,124 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:05:10,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-11-19 07:05:10,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24772659] [2022-11-19 07:05:10,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:05:10,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-19 07:05:10,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:05:10,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-19 07:05:10,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=605, Unknown=0, NotChecked=0, Total=756 [2022-11-19 07:05:10,126 INFO L87 Difference]: Start difference. First operand 51 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) [2022-11-19 07:05:10,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:05:10,493 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2022-11-19 07:05:10,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-19 07:05:10,494 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 [2022-11-19 07:05:10,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:05:10,494 INFO L225 Difference]: With dead ends: 55 [2022-11-19 07:05:10,495 INFO L226 Difference]: Without dead ends: 40 [2022-11-19 07:05:10,495 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 65 SyntacticMatches, 30 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 996 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2022-11-19 07:05:10,496 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 34 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:05:10,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 17 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:05:10,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-19 07:05:10,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-19 07:05:10,518 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) [2022-11-19 07:05:10,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2022-11-19 07:05:10,519 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 36 [2022-11-19 07:05:10,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:05:10,519 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2022-11-19 07:05:10,520 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) [2022-11-19 07:05:10,520 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2022-11-19 07:05:10,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-19 07:05:10,520 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:05:10,521 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:05:10,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 07:05:10,726 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:05:10,727 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:05:10,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:05:10,727 INFO L85 PathProgramCache]: Analyzing trace with hash 1991993769, now seen corresponding path program 15 times [2022-11-19 07:05:10,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:05:10,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841281246] [2022-11-19 07:05:10,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:05:10,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:05:10,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:05:17,150 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 3 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:05:17,151 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:05:17,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841281246] [2022-11-19 07:05:17,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841281246] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:05:17,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048435179] [2022-11-19 07:05:17,151 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:05:17,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:05:17,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:05:17,160 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:05:17,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 07:05:17,291 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:05:17,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:05:17,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 112 conjunts are in the unsatisfiable core [2022-11-19 07:05:17,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:05:19,362 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 6 proven. 84 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-19 07:05:19,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:05:22,917 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:05:22,918 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2022-11-19 07:05:28,079 INFO L321 Elim1Store]: treesize reduction 366, result has 6.4 percent of original size [2022-11-19 07:05:28,079 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2022-11-19 07:05:28,399 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-19 07:05:28,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2048435179] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:05:28,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [946870503] [2022-11-19 07:05:28,401 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:05:28,401 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:05:28,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:05:28,402 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:05:28,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:05:28,485 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:05:28,486 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:05:28,510 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:05:28,537 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 [2022-11-19 07:05:28,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:05:28,631 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:05:28,659 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:05:28,660 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 245 treesize of output 248 [2022-11-19 07:05:28,755 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 [2022-11-19 07:05:28,874 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:05:32,122 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5557#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:05:32,122 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:05:32,123 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:05:32,123 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 20, 25] total 75 [2022-11-19 07:05:32,123 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249171919] [2022-11-19 07:05:32,123 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:05:32,124 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-11-19 07:05:32,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:05:32,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-11-19 07:05:32,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=5957, Unknown=0, NotChecked=0, Total=6320 [2022-11-19 07:05:32,127 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 75 states, 75 states have (on average 1.3733333333333333) internal successors, (103), 75 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:05:41,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:05:41,848 INFO L93 Difference]: Finished difference Result 71 states and 80 transitions. [2022-11-19 07:05:41,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-19 07:05:41,849 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.3733333333333333) internal successors, (103), 75 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-11-19 07:05:41,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:05:41,849 INFO L225 Difference]: With dead ends: 71 [2022-11-19 07:05:41,850 INFO L226 Difference]: Without dead ends: 68 [2022-11-19 07:05:41,854 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 48 SyntacticMatches, 27 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4000 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=866, Invalid=11344, Unknown=0, NotChecked=0, Total=12210 [2022-11-19 07:05:41,855 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 24 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 1688 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 1875 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 1688 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:05:41,856 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 133 Invalid, 1875 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 1688 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-19 07:05:41,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-19 07:05:41,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 56. [2022-11-19 07:05:41,909 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) [2022-11-19 07:05:41,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2022-11-19 07:05:41,909 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 39 [2022-11-19 07:05:41,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:05:41,909 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2022-11-19 07:05:41,910 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.3733333333333333) internal successors, (103), 75 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:05:41,910 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2022-11-19 07:05:41,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-19 07:05:41,910 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:05:41,910 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:05:41,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-19 07:05:42,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 07:05:42,111 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:05:42,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:05:42,112 INFO L85 PathProgramCache]: Analyzing trace with hash 198689501, now seen corresponding path program 16 times [2022-11-19 07:05:42,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:05:42,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403079835] [2022-11-19 07:05:42,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:05:42,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:05:42,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:05:42,405 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-11-19 07:05:42,405 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:05:42,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403079835] [2022-11-19 07:05:42,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1403079835] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:05:42,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817804943] [2022-11-19 07:05:42,405 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:05:42,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:05:42,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:05:42,408 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:05:42,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 07:05:42,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:05:42,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-19 07:05:42,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:05:42,741 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-11-19 07:05:42,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:05:42,907 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-11-19 07:05:42,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817804943] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:05:42,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654068840] [2022-11-19 07:05:42,910 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:05:42,910 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:05:42,910 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:05:42,910 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:05:42,910 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:05:42,982 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:05:42,983 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:05:42,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:05:43,020 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 [2022-11-19 07:05:43,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:05:43,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:05:43,098 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:05:43,099 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 250 treesize of output 247 [2022-11-19 07:05:43,151 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 [2022-11-19 07:05:43,273 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:05:44,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6121#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:05:44,193 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:05:44,194 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:05:44,194 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-11-19 07:05:44,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698572532] [2022-11-19 07:05:44,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:05:44,195 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-19 07:05:44,195 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:05:44,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-19 07:05:44,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2022-11-19 07:05:44,196 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) [2022-11-19 07:05:44,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:05:44,652 INFO L93 Difference]: Finished difference Result 118 states and 133 transitions. [2022-11-19 07:05:44,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-19 07:05:44,652 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 [2022-11-19 07:05:44,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:05:44,653 INFO L225 Difference]: With dead ends: 118 [2022-11-19 07:05:44,653 INFO L226 Difference]: Without dead ends: 65 [2022-11-19 07:05:44,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 72 SyntacticMatches, 34 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=281, Invalid=1051, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 07:05:44,655 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 36 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:05:44,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 13 Invalid, 414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:05:44,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-19 07:05:44,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2022-11-19 07:05:44,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 57 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) [2022-11-19 07:05:44,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 64 transitions. [2022-11-19 07:05:44,688 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 64 transitions. Word has length 40 [2022-11-19 07:05:44,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:05:44,688 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 64 transitions. [2022-11-19 07:05:44,689 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) [2022-11-19 07:05:44,689 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 64 transitions. [2022-11-19 07:05:44,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-19 07:05:44,690 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:05:44,690 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:05:44,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-19 07:05:44,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 07:05:44,897 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:05:44,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:05:44,897 INFO L85 PathProgramCache]: Analyzing trace with hash 65272532, now seen corresponding path program 17 times [2022-11-19 07:05:44,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:05:44,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268230870] [2022-11-19 07:05:44,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:05:44,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:05:44,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:05:45,257 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-19 07:05:45,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:05:45,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268230870] [2022-11-19 07:05:45,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268230870] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:05:45,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [136392513] [2022-11-19 07:05:45,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:05:45,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:05:45,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:05:45,259 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:05:45,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 07:05:45,427 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-19 07:05:45,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:05:45,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-19 07:05:45,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:05:45,656 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-19 07:05:45,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:05:45,876 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-19 07:05:45,876 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [136392513] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:05:45,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [372686748] [2022-11-19 07:05:45,878 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:05:45,878 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:05:45,879 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:05:45,879 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:05:45,879 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:05:45,950 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:05:45,950 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:05:46,021 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:05:46,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:05:46,049 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 [2022-11-19 07:05:46,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:05:46,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:05:46,132 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:05:46,133 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 250 treesize of output 247 [2022-11-19 07:05:46,188 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 [2022-11-19 07:05:46,294 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:05:46,553 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6739#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:05:46,554 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:05:46,554 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:05:46,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-11-19 07:05:46,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860789207] [2022-11-19 07:05:46,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:05:46,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 07:05:46,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:05:46,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 07:05:46,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2022-11-19 07:05:46,556 INFO L87 Difference]: Start difference. First operand 58 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) [2022-11-19 07:05:46,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:05:46,942 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2022-11-19 07:05:46,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-19 07:05:46,943 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 [2022-11-19 07:05:46,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:05:46,944 INFO L225 Difference]: With dead ends: 62 [2022-11-19 07:05:46,944 INFO L226 Difference]: Without dead ends: 45 [2022-11-19 07:05:46,944 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 95 SyntacticMatches, 14 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=301, Invalid=1259, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 07:05:46,945 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:05:46,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 9 Invalid, 373 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:05:46,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-19 07:05:46,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-11-19 07:05:46,971 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) [2022-11-19 07:05:46,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2022-11-19 07:05:46,972 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 41 [2022-11-19 07:05:46,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:05:46,973 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2022-11-19 07:05:46,973 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) [2022-11-19 07:05:46,973 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2022-11-19 07:05:46,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-19 07:05:46,974 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:05:46,974 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:05:46,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 07:05:47,175 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:05:47,176 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:05:47,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:05:47,176 INFO L85 PathProgramCache]: Analyzing trace with hash 1775187002, now seen corresponding path program 18 times [2022-11-19 07:05:47,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:05:47,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158815687] [2022-11-19 07:05:47,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:05:47,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:05:47,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:05:55,411 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 10 proven. 130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:05:55,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:05:55,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158815687] [2022-11-19 07:05:55,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [158815687] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:05:55,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305854920] [2022-11-19 07:05:55,412 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:05:55,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:05:55,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:05:55,413 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:05:55,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 07:05:55,551 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:05:55,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:05:55,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 122 conjunts are in the unsatisfiable core [2022-11-19 07:05:55,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:05:57,939 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-19 07:05:57,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:06:01,197 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:06:01,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 552 [2022-11-19 07:06:12,296 INFO L321 Elim1Store]: treesize reduction 504, result has 5.4 percent of original size [2022-11-19 07:06:12,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 47 [2022-11-19 07:06:12,431 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-19 07:06:12,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305854920] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:06:12,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [405110765] [2022-11-19 07:06:12,433 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:06:12,433 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:06:12,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:06:12,434 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:06:12,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:06:12,503 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:06:12,503 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:06:12,564 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:06:12,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:06:12,590 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 [2022-11-19 07:06:12,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:06:12,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:06:12,658 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:06:12,658 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 250 treesize of output 247 [2022-11-19 07:06:12,708 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 [2022-11-19 07:06:12,826 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:06:13,635 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7296#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:06:13,635 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:06:13,635 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:06:13,636 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 20, 20] total 75 [2022-11-19 07:06:13,636 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763503627] [2022-11-19 07:06:13,636 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:06:13,637 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-11-19 07:06:13,637 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:06:13,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-11-19 07:06:13,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=6000, Unknown=0, NotChecked=0, Total=6320 [2022-11-19 07:06:13,639 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 75 states, 75 states have (on average 1.52) internal successors, (114), 75 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:06:20,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:06:20,939 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2022-11-19 07:06:20,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-19 07:06:20,941 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.52) internal successors, (114), 75 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-19 07:06:20,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:06:20,942 INFO L225 Difference]: With dead ends: 79 [2022-11-19 07:06:20,942 INFO L226 Difference]: Without dead ends: 76 [2022-11-19 07:06:20,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 88 SyntacticMatches, 7 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3325 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=700, Invalid=11732, Unknown=0, NotChecked=0, Total=12432 [2022-11-19 07:06:20,943 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 17 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 1669 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 1669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:06:20,944 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 143 Invalid, 1783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 1669 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-19 07:06:20,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-11-19 07:06:20,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 63. [2022-11-19 07:06:20,987 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) [2022-11-19 07:06:20,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2022-11-19 07:06:20,987 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 44 [2022-11-19 07:06:20,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:06:20,988 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2022-11-19 07:06:20,988 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.52) internal successors, (114), 75 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:06:20,988 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2022-11-19 07:06:20,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-19 07:06:20,989 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:06:20,989 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:06:20,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 07:06:21,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:06:21,196 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:06:21,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:06:21,197 INFO L85 PathProgramCache]: Analyzing trace with hash -1967093956, now seen corresponding path program 19 times [2022-11-19 07:06:21,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:06:21,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329397852] [2022-11-19 07:06:21,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:06:21,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:06:21,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:06:21,542 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-19 07:06:21,542 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:06:21,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329397852] [2022-11-19 07:06:21,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329397852] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:06:21,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200289131] [2022-11-19 07:06:21,542 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:06:21,543 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:06:21,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:06:21,544 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:06:21,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 07:06:21,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:06:21,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 07:06:21,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:06:21,938 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-19 07:06:21,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:06:22,114 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-19 07:06:22,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1200289131] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:06:22,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [927797022] [2022-11-19 07:06:22,116 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:06:22,117 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:06:22,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:06:22,117 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:06:22,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:06:22,185 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:06:22,185 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:06:22,246 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:06:22,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:06:22,270 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 [2022-11-19 07:06:22,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:06:22,325 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:06:22,352 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:06:22,353 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 245 treesize of output 248 [2022-11-19 07:06:22,443 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 [2022-11-19 07:06:22,567 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:06:22,877 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7925#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:06:22,877 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:06:22,877 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:06:22,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-11-19 07:06:22,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784413939] [2022-11-19 07:06:22,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:06:22,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-19 07:06:22,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:06:22,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-19 07:06:22,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=834, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 07:06:22,880 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) [2022-11-19 07:06:23,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:06:23,369 INFO L93 Difference]: Finished difference Result 132 states and 147 transitions. [2022-11-19 07:06:23,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-19 07:06:23,375 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 [2022-11-19 07:06:23,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:06:23,375 INFO L225 Difference]: With dead ends: 132 [2022-11-19 07:06:23,376 INFO L226 Difference]: Without dead ends: 72 [2022-11-19 07:06:23,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 105 SyntacticMatches, 15 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 655 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=346, Invalid=1294, Unknown=0, NotChecked=0, Total=1640 [2022-11-19 07:06:23,377 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 38 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:06:23,378 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 15 Invalid, 433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:06:23,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-19 07:06:23,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 65. [2022-11-19 07:06:23,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.109375) internal successors, (71), 64 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) [2022-11-19 07:06:23,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 71 transitions. [2022-11-19 07:06:23,416 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 71 transitions. Word has length 45 [2022-11-19 07:06:23,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:06:23,416 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 71 transitions. [2022-11-19 07:06:23,416 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) [2022-11-19 07:06:23,416 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 71 transitions. [2022-11-19 07:06:23,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-19 07:06:23,416 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:06:23,417 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:06:23,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 07:06:23,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-19 07:06:23,617 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:06:23,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:06:23,618 INFO L85 PathProgramCache]: Analyzing trace with hash 976990629, now seen corresponding path program 20 times [2022-11-19 07:06:23,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:06:23,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772781372] [2022-11-19 07:06:23,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:06:23,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:06:23,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:06:23,989 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-19 07:06:23,989 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:06:23,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772781372] [2022-11-19 07:06:23,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772781372] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:06:23,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972114210] [2022-11-19 07:06:23,990 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:06:23,990 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:06:23,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:06:23,991 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:06:23,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 07:06:24,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-19 07:06:24,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:06:24,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 07:06:24,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:06:24,420 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-19 07:06:24,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:06:24,631 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-19 07:06:24,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972114210] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:06:24,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [153787028] [2022-11-19 07:06:24,633 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:06:24,633 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:06:24,634 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:06:24,634 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:06:24,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:06:24,705 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:06:24,706 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:06:24,780 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:06:24,780 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:06:24,818 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 [2022-11-19 07:06:24,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:06:24,885 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:06:24,913 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:06:24,913 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 245 treesize of output 248 [2022-11-19 07:06:25,003 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 [2022-11-19 07:06:25,107 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:06:25,979 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8620#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:06:25,979 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:06:25,979 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:06:25,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-11-19 07:06:25,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076210246] [2022-11-19 07:06:25,979 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:06:25,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-19 07:06:25,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:06:25,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-19 07:06:25,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2022-11-19 07:06:25,980 INFO L87 Difference]: Start difference. First operand 65 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) [2022-11-19 07:06:26,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:06:26,471 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2022-11-19 07:06:26,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-19 07:06:26,472 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 [2022-11-19 07:06:26,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:06:26,472 INFO L225 Difference]: With dead ends: 69 [2022-11-19 07:06:26,472 INFO L226 Difference]: Without dead ends: 50 [2022-11-19 07:06:26,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 83 SyntacticMatches, 40 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1666 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=366, Invalid=1526, Unknown=0, NotChecked=0, Total=1892 [2022-11-19 07:06:26,474 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 42 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:06:26,474 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 17 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:06:26,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-19 07:06:26,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-19 07:06:26,502 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) [2022-11-19 07:06:26,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2022-11-19 07:06:26,502 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 46 [2022-11-19 07:06:26,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:06:26,503 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2022-11-19 07:06:26,503 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) [2022-11-19 07:06:26,503 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2022-11-19 07:06:26,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-19 07:06:26,503 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:06:26,504 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:06:26,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-19 07:06:26,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-19 07:06:26,704 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:06:26,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:06:26,705 INFO L85 PathProgramCache]: Analyzing trace with hash 424409865, now seen corresponding path program 21 times [2022-11-19 07:06:26,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:06:26,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953298369] [2022-11-19 07:06:26,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:06:26,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:06:26,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:06:37,997 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:06:37,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:06:37,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953298369] [2022-11-19 07:06:37,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953298369] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:06:37,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670445817] [2022-11-19 07:06:37,998 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:06:37,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:06:37,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:06:37,999 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:06:38,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 07:06:38,155 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:06:38,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:06:38,161 WARN L261 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 147 conjunts are in the unsatisfiable core [2022-11-19 07:06:38,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:06:38,281 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 [2022-11-19 07:06:38,292 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 [2022-11-19 07:06:41,890 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 07:06:41,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:06:48,229 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 152 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-19 07:06:48,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [670445817] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:06:48,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1664260167] [2022-11-19 07:06:48,232 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:06:48,232 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:06:48,232 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:06:48,232 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:06:48,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:06:48,304 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:06:48,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:06:48,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:06:48,344 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 [2022-11-19 07:06:48,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:06:48,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:06:48,422 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:06:48,423 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 250 treesize of output 247 [2022-11-19 07:06:48,476 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 16 treesize of output 12 [2022-11-19 07:06:48,600 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:06:54,358 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9250#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:06:54,358 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:06:54,358 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:06:54,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 22, 30] total 92 [2022-11-19 07:06:54,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978564261] [2022-11-19 07:06:54,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:06:54,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-11-19 07:06:54,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:06:54,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-11-19 07:06:54,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=8893, Unknown=0, NotChecked=0, Total=9312 [2022-11-19 07:06:54,365 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 92 states, 92 states have (on average 1.391304347826087) internal successors, (128), 92 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:07:07,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:07:07,670 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2022-11-19 07:07:07,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-19 07:07:07,671 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.391304347826087) internal successors, (128), 92 states have internal predecessors, (128), 0 states have call successors, (0), 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 [2022-11-19 07:07:07,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:07:07,672 INFO L225 Difference]: With dead ends: 87 [2022-11-19 07:07:07,672 INFO L226 Difference]: Without dead ends: 84 [2022-11-19 07:07:07,674 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 61 SyntacticMatches, 37 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5207 ImplicationChecksByTransitivity, 28.5s TimeCoverageRelationStatistics Valid=802, Invalid=15710, Unknown=0, NotChecked=0, Total=16512 [2022-11-19 07:07:07,675 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 27 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 2538 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 2679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 2538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:07:07,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 174 Invalid, 2679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 2538 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-11-19 07:07:07,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-19 07:07:07,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 70. [2022-11-19 07:07:07,721 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) [2022-11-19 07:07:07,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2022-11-19 07:07:07,722 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 49 [2022-11-19 07:07:07,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:07:07,722 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2022-11-19 07:07:07,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 1.391304347826087) internal successors, (128), 92 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:07:07,723 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2022-11-19 07:07:07,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-19 07:07:07,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:07:07,723 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:07:07,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-19 07:07:07,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:07:07,924 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:07:07,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:07:07,925 INFO L85 PathProgramCache]: Analyzing trace with hash -852919811, now seen corresponding path program 22 times [2022-11-19 07:07:07,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:07:07,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60887209] [2022-11-19 07:07:07,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:07:07,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:07:07,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:07:08,302 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-11-19 07:07:08,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:07:08,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60887209] [2022-11-19 07:07:08,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60887209] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:07:08,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18437255] [2022-11-19 07:07:08,303 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:07:08,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:07:08,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:07:08,308 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:07:08,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 07:07:08,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:07:08,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 07:07:08,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:07:08,783 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-11-19 07:07:08,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:07:08,992 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-11-19 07:07:08,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18437255] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:07:08,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [800394004] [2022-11-19 07:07:08,995 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:07:08,995 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:07:08,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:07:08,996 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:07:08,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:07:09,061 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:07:09,062 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:07:09,124 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:07:09,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:07:09,153 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 [2022-11-19 07:07:09,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:07:09,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:07:09,218 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:07:09,219 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 250 treesize of output 247 [2022-11-19 07:07:09,266 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 [2022-11-19 07:07:09,394 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:07:10,582 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9942#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:07:10,582 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:07:10,582 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:07:10,583 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-11-19 07:07:10,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31047797] [2022-11-19 07:07:10,583 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:07:10,583 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-19 07:07:10,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:07:10,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-19 07:07:10,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=995, Unknown=0, NotChecked=0, Total=1260 [2022-11-19 07:07:10,584 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) [2022-11-19 07:07:11,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:07:11,212 INFO L93 Difference]: Finished difference Result 146 states and 161 transitions. [2022-11-19 07:07:11,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-19 07:07:11,213 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 [2022-11-19 07:07:11,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:07:11,214 INFO L225 Difference]: With dead ends: 146 [2022-11-19 07:07:11,214 INFO L226 Difference]: Without dead ends: 79 [2022-11-19 07:07:11,215 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 90 SyntacticMatches, 44 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1579 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 07:07:11,216 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 46 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 336 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 590 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:07:11,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 17 Invalid, 590 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [336 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:07:11,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-19 07:07:11,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2022-11-19 07:07:11,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 71 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) [2022-11-19 07:07:11,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 78 transitions. [2022-11-19 07:07:11,270 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 78 transitions. Word has length 50 [2022-11-19 07:07:11,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:07:11,270 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 78 transitions. [2022-11-19 07:07:11,270 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) [2022-11-19 07:07:11,270 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 78 transitions. [2022-11-19 07:07:11,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-19 07:07:11,271 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:07:11,271 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:07:11,277 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-19 07:07:11,471 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:07:11,472 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:07:11,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:07:11,472 INFO L85 PathProgramCache]: Analyzing trace with hash -247109324, now seen corresponding path program 23 times [2022-11-19 07:07:11,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:07:11,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803963386] [2022-11-19 07:07:11,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:07:11,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:07:11,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:07:11,885 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-11-19 07:07:11,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:07:11,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803963386] [2022-11-19 07:07:11,886 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803963386] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:07:11,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892836850] [2022-11-19 07:07:11,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:07:11,886 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:07:11,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:07:11,889 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:07:11,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-19 07:07:12,186 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-19 07:07:12,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:07:12,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 07:07:12,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:07:12,468 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-11-19 07:07:12,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:07:12,748 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-11-19 07:07:12,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892836850] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:07:12,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [942852643] [2022-11-19 07:07:12,750 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:07:12,750 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:07:12,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:07:12,751 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:07:12,751 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:07:12,829 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:07:12,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:07:12,842 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:07:12,869 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 [2022-11-19 07:07:12,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:07:12,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:07:12,961 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:07:12,963 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 250 treesize of output 247 [2022-11-19 07:07:13,029 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 [2022-11-19 07:07:13,134 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:07:14,239 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10714#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:07:14,240 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:07:14,240 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:07:14,240 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2022-11-19 07:07:14,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451597436] [2022-11-19 07:07:14,240 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:07:14,241 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-19 07:07:14,241 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:07:14,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-19 07:07:14,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 07:07:14,242 INFO L87 Difference]: Start difference. First operand 72 states and 78 transitions. Second operand has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 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) [2022-11-19 07:07:14,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:07:14,795 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2022-11-19 07:07:14,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-19 07:07:14,796 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 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 [2022-11-19 07:07:14,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:07:14,796 INFO L225 Difference]: With dead ends: 76 [2022-11-19 07:07:14,797 INFO L226 Difference]: Without dead ends: 55 [2022-11-19 07:07:14,797 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 93 SyntacticMatches, 45 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2064 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=438, Invalid=1818, Unknown=0, NotChecked=0, Total=2256 [2022-11-19 07:07:14,798 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 31 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:07:14,798 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 13 Invalid, 523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:07:14,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-19 07:07:14,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-11-19 07:07:14,838 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) [2022-11-19 07:07:14,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2022-11-19 07:07:14,839 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 51 [2022-11-19 07:07:14,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:07:14,839 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2022-11-19 07:07:14,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 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) [2022-11-19 07:07:14,839 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2022-11-19 07:07:14,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-19 07:07:14,840 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:07:14,840 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:07:14,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-19 07:07:15,043 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-19 07:07:15,043 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:07:15,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:07:15,044 INFO L85 PathProgramCache]: Analyzing trace with hash 1248847450, now seen corresponding path program 24 times [2022-11-19 07:07:15,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:07:15,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696909834] [2022-11-19 07:07:15,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:07:15,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:07:15,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:07:28,800 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 9 proven. 216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:07:28,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:07:28,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [696909834] [2022-11-19 07:07:28,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [696909834] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:07:28,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213517651] [2022-11-19 07:07:28,801 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:07:28,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:07:28,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:07:28,802 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:07:28,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-19 07:07:28,937 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:07:28,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:07:28,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 154 conjunts are in the unsatisfiable core [2022-11-19 07:07:28,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:07:32,647 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-19 07:07:32,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:07:37,698 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:07:37,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 906 [2022-11-19 07:07:58,087 INFO L321 Elim1Store]: treesize reduction 846, result has 4.2 percent of original size [2022-11-19 07:07:58,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 59 [2022-11-19 07:07:58,253 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-19 07:07:58,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213517651] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:07:58,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [346329910] [2022-11-19 07:07:58,255 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:07:58,255 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:07:58,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:07:58,255 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:07:58,256 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:07:58,321 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:07:58,322 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:07:58,332 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:07:58,350 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 [2022-11-19 07:07:58,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:07:58,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:07:58,408 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:07:58,409 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 250 treesize of output 247 [2022-11-19 07:07:58,454 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 [2022-11-19 07:07:58,533 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:07:59,357 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11402#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:07:59,357 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:07:59,357 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:07:59,358 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 24, 24] total 93 [2022-11-19 07:07:59,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184524256] [2022-11-19 07:07:59,358 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:07:59,358 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-19 07:07:59,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:07:59,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-19 07:07:59,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=9021, Unknown=0, NotChecked=0, Total=9506 [2022-11-19 07:07:59,360 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 93 states, 93 states have (on average 1.5053763440860215) internal successors, (140), 93 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) [2022-11-19 07:08:14,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:14,837 INFO L93 Difference]: Finished difference Result 95 states and 104 transitions. [2022-11-19 07:08:14,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-19 07:08:14,837 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.5053763440860215) internal successors, (140), 93 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) Word has length 54 [2022-11-19 07:08:14,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:14,838 INFO L225 Difference]: With dead ends: 95 [2022-11-19 07:08:14,839 INFO L226 Difference]: Without dead ends: 92 [2022-11-19 07:08:14,841 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 108 SyntacticMatches, 9 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6511 ImplicationChecksByTransitivity, 23.7s TimeCoverageRelationStatistics Valid=1360, Invalid=20692, Unknown=0, NotChecked=0, Total=22052 [2022-11-19 07:08:14,841 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 28 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 2394 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 2598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 2394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:14,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 175 Invalid, 2598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 2394 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-11-19 07:08:14,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-19 07:08:14,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 77. [2022-11-19 07:08:14,902 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) [2022-11-19 07:08:14,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 84 transitions. [2022-11-19 07:08:14,903 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 84 transitions. Word has length 54 [2022-11-19 07:08:14,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:14,903 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 84 transitions. [2022-11-19 07:08:14,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.5053763440860215) internal successors, (140), 93 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) [2022-11-19 07:08:14,903 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 84 transitions. [2022-11-19 07:08:14,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-19 07:08:14,904 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:14,904 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:14,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:15,104 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-19 07:08:15,105 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:15,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:15,105 INFO L85 PathProgramCache]: Analyzing trace with hash 2141033884, now seen corresponding path program 25 times [2022-11-19 07:08:15,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:15,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136379523] [2022-11-19 07:08:15,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:15,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:15,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:15,587 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-19 07:08:15,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:15,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136379523] [2022-11-19 07:08:15,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136379523] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:15,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025671251] [2022-11-19 07:08:15,588 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:08:15,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:15,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:15,590 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:15,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-19 07:08:15,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:15,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-19 07:08:15,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:16,027 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-19 07:08:16,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:16,257 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-19 07:08:16,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025671251] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:16,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1114089519] [2022-11-19 07:08:16,258 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:08:16,258 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:16,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:16,259 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:16,259 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:16,316 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:08:16,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:08:16,373 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:08:16,374 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:08:16,391 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 [2022-11-19 07:08:16,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:08:16,435 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:08:16,457 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:08:16,458 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 245 treesize of output 248 [2022-11-19 07:08:16,505 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 [2022-11-19 07:08:16,587 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:16,907 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12195#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:08:16,907 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:16,907 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:16,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2022-11-19 07:08:16,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625814896] [2022-11-19 07:08:16,908 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:16,908 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-19 07:08:16,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:16,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-19 07:08:16,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=1170, Unknown=0, NotChecked=0, Total=1482 [2022-11-19 07:08:16,908 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) [2022-11-19 07:08:17,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:17,474 INFO L93 Difference]: Finished difference Result 160 states and 175 transitions. [2022-11-19 07:08:17,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-19 07:08:17,475 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 [2022-11-19 07:08:17,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:17,476 INFO L225 Difference]: With dead ends: 160 [2022-11-19 07:08:17,476 INFO L226 Difference]: Without dead ends: 86 [2022-11-19 07:08:17,476 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 129 SyntacticMatches, 19 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=497, Invalid=1855, Unknown=0, NotChecked=0, Total=2352 [2022-11-19 07:08:17,477 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 278 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 278 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:17,477 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 19 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [278 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:08:17,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-19 07:08:17,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 79. [2022-11-19 07:08:17,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0897435897435896) internal successors, (85), 78 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) [2022-11-19 07:08:17,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2022-11-19 07:08:17,529 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 55 [2022-11-19 07:08:17,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:17,529 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2022-11-19 07:08:17,529 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) [2022-11-19 07:08:17,530 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2022-11-19 07:08:17,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-19 07:08:17,530 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:17,530 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:17,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:17,730 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:17,731 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:17,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:17,731 INFO L85 PathProgramCache]: Analyzing trace with hash -394686267, now seen corresponding path program 26 times [2022-11-19 07:08:17,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:17,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848791989] [2022-11-19 07:08:17,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:17,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:17,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:18,205 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-11-19 07:08:18,205 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:18,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848791989] [2022-11-19 07:08:18,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [848791989] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:18,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506298627] [2022-11-19 07:08:18,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:08:18,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:18,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:18,207 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:18,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-19 07:08:18,424 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-19 07:08:18,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:18,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-19 07:08:18,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:18,719 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-11-19 07:08:18,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:19,012 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-11-19 07:08:19,012 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [506298627] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:19,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2050817432] [2022-11-19 07:08:19,014 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:08:19,014 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:19,015 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:19,015 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:19,015 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:19,080 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:08:19,081 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:08:19,093 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:08:19,114 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 [2022-11-19 07:08:19,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:08:19,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:08:19,187 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:08:19,188 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 250 treesize of output 247 [2022-11-19 07:08:19,234 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 [2022-11-19 07:08:19,316 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:19,594 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13044#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:08:19,594 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:19,594 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:19,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-11-19 07:08:19,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514835386] [2022-11-19 07:08:19,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:19,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-19 07:08:19,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:19,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-19 07:08:19,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1249, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 07:08:19,597 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 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) [2022-11-19 07:08:20,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:20,211 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2022-11-19 07:08:20,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-19 07:08:20,211 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 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 [2022-11-19 07:08:20,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:20,212 INFO L225 Difference]: With dead ends: 83 [2022-11-19 07:08:20,212 INFO L226 Difference]: Without dead ends: 60 [2022-11-19 07:08:20,212 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 132 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=517, Invalid=2135, Unknown=0, NotChecked=0, Total=2652 [2022-11-19 07:08:20,213 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 377 mSolverCounterSat, 188 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 188 IncrementalHoareTripleChecker+Valid, 377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:20,213 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 13 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [188 Valid, 377 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:08:20,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-19 07:08:20,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-11-19 07:08:20,254 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) [2022-11-19 07:08:20,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2022-11-19 07:08:20,255 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2022-11-19 07:08:20,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:20,255 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2022-11-19 07:08:20,255 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 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) [2022-11-19 07:08:20,255 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2022-11-19 07:08:20,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-19 07:08:20,256 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:20,256 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:20,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:20,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-19 07:08:20,463 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:20,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:20,464 INFO L85 PathProgramCache]: Analyzing trace with hash 2064065641, now seen corresponding path program 27 times [2022-11-19 07:08:20,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:20,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923482760] [2022-11-19 07:08:20,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:20,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:20,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:36,721 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 13 proven. 262 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:36,721 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:36,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923482760] [2022-11-19 07:08:36,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923482760] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:36,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017032035] [2022-11-19 07:08:36,721 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:08:36,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:36,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:36,723 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:36,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-19 07:08:36,909 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:08:36,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:36,914 WARN L261 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 172 conjunts are in the unsatisfiable core [2022-11-19 07:08:36,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:37,057 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 [2022-11-19 07:08:42,180 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-19 07:08:42,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:47,268 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-19 07:08:47,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017032035] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:47,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [758170255] [2022-11-19 07:08:47,270 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:08:47,270 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:47,270 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:47,271 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:47,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:47,326 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:08:47,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:08:47,377 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:08:47,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:08:47,396 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 [2022-11-19 07:08:47,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:08:47,449 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:08:47,476 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:08:47,477 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 245 treesize of output 248 [2022-11-19 07:08:47,526 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 [2022-11-19 07:08:47,627 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:53,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13796#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:08:53,306 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:53,306 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:53,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 26, 25] total 101 [2022-11-19 07:08:53,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252813106] [2022-11-19 07:08:53,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:53,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-19 07:08:53,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:53,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-19 07:08:53,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=10573, Unknown=0, NotChecked=0, Total=11130 [2022-11-19 07:08:53,308 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 101 states, 101 states have (on average 1.5148514851485149) internal successors, (153), 101 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:11,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:11,128 INFO L93 Difference]: Finished difference Result 103 states and 112 transitions. [2022-11-19 07:09:11,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-11-19 07:09:11,129 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.5148514851485149) internal successors, (153), 101 states have internal predecessors, (153), 0 states have call successors, (0), 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 [2022-11-19 07:09:11,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:11,129 INFO L225 Difference]: With dead ends: 103 [2022-11-19 07:09:11,129 INFO L226 Difference]: Without dead ends: 100 [2022-11-19 07:09:11,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 83 SyntacticMatches, 46 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10625 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=1589, Invalid=24493, Unknown=0, NotChecked=0, Total=26082 [2022-11-19 07:09:11,131 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 32 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 3356 mSolverCounterSat, 271 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 3627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 271 IncrementalHoareTripleChecker+Valid, 3356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:11,132 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 225 Invalid, 3627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [271 Valid, 3356 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-11-19 07:09:11,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-11-19 07:09:11,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 84. [2022-11-19 07:09:11,186 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) [2022-11-19 07:09:11,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 91 transitions. [2022-11-19 07:09:11,187 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 91 transitions. Word has length 59 [2022-11-19 07:09:11,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:11,187 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 91 transitions. [2022-11-19 07:09:11,187 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.5148514851485149) internal successors, (153), 101 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:11,187 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 91 transitions. [2022-11-19 07:09:11,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-19 07:09:11,188 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:11,188 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:11,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:11,388 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-19 07:09:11,388 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:11,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:11,389 INFO L85 PathProgramCache]: Analyzing trace with hash -1231103715, now seen corresponding path program 28 times [2022-11-19 07:09:11,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:11,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550253128] [2022-11-19 07:09:11,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:11,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:11,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:11,795 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-11-19 07:09:11,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:11,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550253128] [2022-11-19 07:09:11,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550253128] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:11,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340713674] [2022-11-19 07:09:11,795 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:09:11,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:11,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:11,796 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:11,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-19 07:09:11,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:11,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-19 07:09:11,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:12,225 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-11-19 07:09:12,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:12,461 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-11-19 07:09:12,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340713674] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:12,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1972164821] [2022-11-19 07:09:12,463 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:09:12,463 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:12,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:12,464 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:12,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:12,536 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:09:12,536 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:09:12,549 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:09:12,566 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 [2022-11-19 07:09:12,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:09:12,609 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:09:12,631 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:09:12,631 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 245 treesize of output 248 [2022-11-19 07:09:12,676 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 [2022-11-19 07:09:12,772 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:13,991 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14662#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:09:13,991 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:13,991 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:13,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2022-11-19 07:09:13,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127145182] [2022-11-19 07:09:13,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:13,992 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-19 07:09:13,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:13,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-19 07:09:13,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1359, Unknown=0, NotChecked=0, Total=1722 [2022-11-19 07:09:13,993 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) [2022-11-19 07:09:14,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:14,641 INFO L93 Difference]: Finished difference Result 174 states and 189 transitions. [2022-11-19 07:09:14,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-19 07:09:14,642 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 [2022-11-19 07:09:14,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:14,642 INFO L225 Difference]: With dead ends: 174 [2022-11-19 07:09:14,643 INFO L226 Difference]: Without dead ends: 93 [2022-11-19 07:09:14,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 108 SyntacticMatches, 54 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2272 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=583, Invalid=2173, Unknown=0, NotChecked=0, Total=2756 [2022-11-19 07:09:14,644 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 393 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 393 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:14,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 17 Invalid, 737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [393 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:09:14,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-19 07:09:14,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 86. [2022-11-19 07:09:14,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0823529411764705) internal successors, (92), 85 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) [2022-11-19 07:09:14,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 92 transitions. [2022-11-19 07:09:14,709 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 92 transitions. Word has length 60 [2022-11-19 07:09:14,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:14,709 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 92 transitions. [2022-11-19 07:09:14,710 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) [2022-11-19 07:09:14,710 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 92 transitions. [2022-11-19 07:09:14,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-19 07:09:14,710 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:14,710 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:14,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:14,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:14,911 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:14,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:14,911 INFO L85 PathProgramCache]: Analyzing trace with hash 889089940, now seen corresponding path program 29 times [2022-11-19 07:09:14,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:14,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465605053] [2022-11-19 07:09:14,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:14,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:14,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:15,315 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-11-19 07:09:15,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:15,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465605053] [2022-11-19 07:09:15,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465605053] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:15,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076643293] [2022-11-19 07:09:15,316 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:09:15,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:15,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:15,317 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:15,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-19 07:09:15,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-19 07:09:15,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:15,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-19 07:09:15,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:15,798 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-11-19 07:09:15,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:16,074 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-11-19 07:09:16,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076643293] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:16,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1321940874] [2022-11-19 07:09:16,076 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:09:16,076 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:16,076 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:16,077 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:16,077 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:16,123 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:09:16,124 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:09:16,173 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:09:16,173 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:09:16,213 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 [2022-11-19 07:09:16,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:09:16,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:09:16,269 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:09:16,269 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 250 treesize of output 247 [2022-11-19 07:09:16,307 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 [2022-11-19 07:09:16,388 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:17,378 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15588#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:09:17,378 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:17,378 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:17,378 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2022-11-19 07:09:17,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812731495] [2022-11-19 07:09:17,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:17,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-19 07:09:17,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:17,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-19 07:09:17,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=1445, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 07:09:17,380 INFO L87 Difference]: Start difference. First operand 86 states and 92 transitions. Second operand has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 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) [2022-11-19 07:09:17,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:17,947 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2022-11-19 07:09:17,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-19 07:09:17,947 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 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 [2022-11-19 07:09:17,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:17,948 INFO L225 Difference]: With dead ends: 90 [2022-11-19 07:09:17,948 INFO L226 Difference]: Without dead ends: 65 [2022-11-19 07:09:17,948 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 111 SyntacticMatches, 55 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2986 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=603, Invalid=2477, Unknown=0, NotChecked=0, Total=3080 [2022-11-19 07:09:17,949 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 222 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 222 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:17,949 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 15 Invalid, 648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [222 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:09:17,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-19 07:09:18,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-11-19 07:09:18,003 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) [2022-11-19 07:09:18,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2022-11-19 07:09:18,003 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 61 [2022-11-19 07:09:18,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:18,003 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2022-11-19 07:09:18,003 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 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) [2022-11-19 07:09:18,004 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2022-11-19 07:09:18,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-19 07:09:18,004 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:18,004 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:18,011 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-11-19 07:09:18,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:18,207 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:18,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:18,207 INFO L85 PathProgramCache]: Analyzing trace with hash 824688762, now seen corresponding path program 30 times [2022-11-19 07:09:18,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:18,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598783125] [2022-11-19 07:09:18,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:18,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:18,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:37,101 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 28 proven. 302 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:37,102 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:37,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598783125] [2022-11-19 07:09:37,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598783125] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:37,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359188692] [2022-11-19 07:09:37,102 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:09:37,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:37,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:37,104 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:37,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-19 07:09:37,312 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:09:37,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:37,317 WARN L261 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 188 conjunts are in the unsatisfiable core [2022-11-19 07:09:37,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:37,450 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 [2022-11-19 07:09:42,384 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-19 07:09:42,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:47,918 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-19 07:09:47,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359188692] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:47,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [777307963] [2022-11-19 07:09:47,920 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:09:47,920 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:47,920 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:47,920 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:47,920 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:47,973 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:09:47,974 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:09:48,022 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:09:48,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:09:48,043 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 [2022-11-19 07:09:48,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:09:48,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:09:48,105 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:09:48,105 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 250 treesize of output 247 [2022-11-19 07:09:48,148 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 [2022-11-19 07:09:48,231 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:49,186 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16405#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:09:49,186 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:49,186 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:49,187 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 28, 27] total 110 [2022-11-19 07:09:49,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294531341] [2022-11-19 07:09:49,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:49,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2022-11-19 07:09:49,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:49,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2022-11-19 07:09:49,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=12553, Unknown=0, NotChecked=0, Total=13110 [2022-11-19 07:09:49,189 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand has 110 states, 110 states have (on average 1.509090909090909) internal successors, (166), 110 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:11,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:11,245 INFO L93 Difference]: Finished difference Result 111 states and 120 transitions. [2022-11-19 07:10:11,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-19 07:10:11,246 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 1.509090909090909) internal successors, (166), 110 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-19 07:10:11,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:11,247 INFO L225 Difference]: With dead ends: 111 [2022-11-19 07:10:11,247 INFO L226 Difference]: Without dead ends: 108 [2022-11-19 07:10:11,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 130 SyntacticMatches, 10 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8353 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=1682, Invalid=28420, Unknown=0, NotChecked=0, Total=30102 [2022-11-19 07:10:11,249 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 3593 mSolverCounterSat, 251 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 3844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 251 IncrementalHoareTripleChecker+Valid, 3593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:11,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 220 Invalid, 3844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [251 Valid, 3593 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2022-11-19 07:10:11,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-11-19 07:10:11,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 91. [2022-11-19 07:10:11,315 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) [2022-11-19 07:10:11,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2022-11-19 07:10:11,316 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 64 [2022-11-19 07:10:11,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:11,317 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2022-11-19 07:10:11,317 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 1.509090909090909) internal successors, (166), 110 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:11,317 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2022-11-19 07:10:11,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-19 07:10:11,317 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:11,317 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:11,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-19 07:10:11,518 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-19 07:10:11,518 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:11,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:11,518 INFO L85 PathProgramCache]: Analyzing trace with hash 87604220, now seen corresponding path program 31 times [2022-11-19 07:10:11,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:11,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476606310] [2022-11-19 07:10:11,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:11,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:11,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:11,973 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-11-19 07:10:11,973 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:11,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476606310] [2022-11-19 07:10:11,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [476606310] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:11,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727061864] [2022-11-19 07:10:11,974 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:10:11,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:11,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:11,975 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:11,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-19 07:10:12,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:12,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-19 07:10:12,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:12,455 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-11-19 07:10:12,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:12,734 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-11-19 07:10:12,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727061864] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:12,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1947414060] [2022-11-19 07:10:12,735 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:10:12,735 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:12,736 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:12,736 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:12,736 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:12,784 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:10:12,785 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:10:12,832 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:10:12,832 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:10:12,853 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 [2022-11-19 07:10:12,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:10:12,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:10:12,905 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:10:12,906 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 250 treesize of output 247 [2022-11-19 07:10:12,941 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 [2022-11-19 07:10:13,010 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:13,299 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17340#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:10:13,299 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:13,299 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:13,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2022-11-19 07:10:13,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870675454] [2022-11-19 07:10:13,300 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:13,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-19 07:10:13,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:13,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-19 07:10:13,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 07:10:13,301 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) [2022-11-19 07:10:14,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:14,019 INFO L93 Difference]: Finished difference Result 188 states and 203 transitions. [2022-11-19 07:10:14,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-19 07:10:14,019 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 [2022-11-19 07:10:14,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:14,020 INFO L225 Difference]: With dead ends: 188 [2022-11-19 07:10:14,020 INFO L226 Difference]: Without dead ends: 100 [2022-11-19 07:10:14,021 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 153 SyntacticMatches, 23 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1297 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=676, Invalid=2516, Unknown=0, NotChecked=0, Total=3192 [2022-11-19 07:10:14,021 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 394 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 791 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 394 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:14,022 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 13 Invalid, 791 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [394 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:10:14,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-11-19 07:10:14,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2022-11-19 07:10:14,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.076086956521739) internal successors, (99), 92 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) [2022-11-19 07:10:14,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 99 transitions. [2022-11-19 07:10:14,126 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 99 transitions. Word has length 65 [2022-11-19 07:10:14,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:14,126 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 99 transitions. [2022-11-19 07:10:14,126 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) [2022-11-19 07:10:14,126 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 99 transitions. [2022-11-19 07:10:14,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-19 07:10:14,127 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:14,127 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:14,134 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-11-19 07:10:14,333 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-19 07:10:14,333 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:14,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:14,334 INFO L85 PathProgramCache]: Analyzing trace with hash 1815582693, now seen corresponding path program 32 times [2022-11-19 07:10:14,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:14,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040913031] [2022-11-19 07:10:14,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:14,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:14,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:14,840 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-11-19 07:10:14,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:14,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040913031] [2022-11-19 07:10:14,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040913031] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:14,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925689874] [2022-11-19 07:10:14,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:10:14,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:14,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:14,842 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:14,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-19 07:10:15,134 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-19 07:10:15,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:10:15,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-19 07:10:15,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:15,411 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-11-19 07:10:15,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:15,702 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-11-19 07:10:15,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925689874] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:15,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [649434676] [2022-11-19 07:10:15,704 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:10:15,704 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:15,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:15,704 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:15,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:15,757 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:10:15,757 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:10:15,805 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:10:15,805 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:10:15,825 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 31 treesize of output 33 [2022-11-19 07:10:15,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:10:15,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:10:15,889 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:10:15,890 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 250 treesize of output 247 [2022-11-19 07:10:15,930 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 [2022-11-19 07:10:16,009 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:17,126 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18343#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:10:17,127 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:17,127 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:17,127 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-11-19 07:10:17,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334813707] [2022-11-19 07:10:17,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:17,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-19 07:10:17,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:17,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-19 07:10:17,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=1655, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 07:10:17,129 INFO L87 Difference]: Start difference. First operand 93 states and 99 transitions. Second operand has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 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) [2022-11-19 07:10:17,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:17,760 INFO L93 Difference]: Finished difference Result 97 states and 103 transitions. [2022-11-19 07:10:17,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-19 07:10:17,761 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 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 [2022-11-19 07:10:17,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:17,761 INFO L225 Difference]: With dead ends: 97 [2022-11-19 07:10:17,761 INFO L226 Difference]: Without dead ends: 70 [2022-11-19 07:10:17,762 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 120 SyntacticMatches, 60 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3510 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=696, Invalid=2844, Unknown=0, NotChecked=0, Total=3540 [2022-11-19 07:10:17,762 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 30 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 625 mSolverCounterSat, 220 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 845 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 220 IncrementalHoareTripleChecker+Valid, 625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:17,762 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 17 Invalid, 845 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [220 Valid, 625 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:10:17,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-19 07:10:17,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2022-11-19 07:10:17,819 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) [2022-11-19 07:10:17,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2022-11-19 07:10:17,819 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 66 [2022-11-19 07:10:17,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:17,820 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2022-11-19 07:10:17,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 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) [2022-11-19 07:10:17,820 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2022-11-19 07:10:17,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-19 07:10:17,821 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:17,821 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:17,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-19 07:10:18,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:18,027 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:18,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:18,027 INFO L85 PathProgramCache]: Analyzing trace with hash -1006180919, now seen corresponding path program 33 times [2022-11-19 07:10:18,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:18,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005206145] [2022-11-19 07:10:18,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:18,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:18,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:36,335 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 24 proven. 366 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:36,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:36,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005206145] [2022-11-19 07:10:36,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1005206145] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:36,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810028968] [2022-11-19 07:10:36,335 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:10:36,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:36,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:36,336 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:36,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-19 07:10:36,530 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:10:36,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:10:36,536 WARN L261 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 206 conjunts are in the unsatisfiable core [2022-11-19 07:10:36,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:36,673 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 [2022-11-19 07:10:42,732 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-19 07:10:42,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:49,531 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-19 07:10:49,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810028968] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:49,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [898152273] [2022-11-19 07:10:49,532 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:10:49,533 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:49,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:49,533 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:49,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:49,593 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:10:49,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:10:49,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:10:49,620 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 [2022-11-19 07:10:49,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:10:49,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:10:49,672 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:10:49,672 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 250 treesize of output 247 [2022-11-19 07:10:49,711 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 [2022-11-19 07:10:49,804 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:57,726 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19225#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:10:57,726 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:57,727 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:57,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 30, 29] total 119 [2022-11-19 07:10:57,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97094643] [2022-11-19 07:10:57,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:57,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-11-19 07:10:57,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:57,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-11-19 07:10:57,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=14584, Unknown=0, NotChecked=0, Total=15252 [2022-11-19 07:10:57,730 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 119 states, 119 states have (on average 1.504201680672269) internal successors, (179), 119 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:22,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:22,752 INFO L93 Difference]: Finished difference Result 119 states and 128 transitions. [2022-11-19 07:11:22,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-19 07:11:22,752 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.504201680672269) internal successors, (179), 119 states have internal predecessors, (179), 0 states have call successors, (0), 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 [2022-11-19 07:11:22,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:22,753 INFO L225 Difference]: With dead ends: 119 [2022-11-19 07:11:22,753 INFO L226 Difference]: Without dead ends: 116 [2022-11-19 07:11:22,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 100 SyntacticMatches, 51 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14350 ImplicationChecksByTransitivity, 45.4s TimeCoverageRelationStatistics Valid=2062, Invalid=33848, Unknown=0, NotChecked=0, Total=35910 [2022-11-19 07:11:22,755 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 33 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 4337 mSolverCounterSat, 298 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 4635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 298 IncrementalHoareTripleChecker+Valid, 4337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:22,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 254 Invalid, 4635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [298 Valid, 4337 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2022-11-19 07:11:22,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-19 07:11:22,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 98. [2022-11-19 07:11:22,834 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) [2022-11-19 07:11:22,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2022-11-19 07:11:22,834 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 69 [2022-11-19 07:11:22,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:22,835 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2022-11-19 07:11:22,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.504201680672269) internal successors, (179), 119 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:22,835 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2022-11-19 07:11:22,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-19 07:11:22,835 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:22,835 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:11:22,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-19 07:11:23,036 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:23,036 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:11:23,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:23,036 INFO L85 PathProgramCache]: Analyzing trace with hash 117301309, now seen corresponding path program 34 times [2022-11-19 07:11:23,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:23,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913715494] [2022-11-19 07:11:23,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:23,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:23,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:23,481 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-11-19 07:11:23,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:23,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913715494] [2022-11-19 07:11:23,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913715494] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:23,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183106283] [2022-11-19 07:11:23,482 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:11:23,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:23,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:23,483 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:23,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-19 07:11:23,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:23,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-19 07:11:23,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:24,021 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-11-19 07:11:24,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:24,319 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-11-19 07:11:24,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [183106283] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:24,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [428707252] [2022-11-19 07:11:24,320 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:11:24,320 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:24,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:24,320 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:24,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:24,374 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:11:24,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:11:24,446 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:11:24,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:11:24,465 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 [2022-11-19 07:11:24,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:24,504 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:11:24,527 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:11:24,527 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 245 treesize of output 248 [2022-11-19 07:11:24,596 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 [2022-11-19 07:11:24,677 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:26,232 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20237#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:11:26,232 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:26,232 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:26,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-11-19 07:11:26,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266187176] [2022-11-19 07:11:26,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:26,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-19 07:11:26,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:26,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-19 07:11:26,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=1779, Unknown=0, NotChecked=0, Total=2256 [2022-11-19 07:11:26,234 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) [2022-11-19 07:11:27,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:27,048 INFO L93 Difference]: Finished difference Result 202 states and 217 transitions. [2022-11-19 07:11:27,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 07:11:27,049 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 [2022-11-19 07:11:27,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:27,050 INFO L225 Difference]: With dead ends: 202 [2022-11-19 07:11:27,050 INFO L226 Difference]: Without dead ends: 107 [2022-11-19 07:11:27,050 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 126 SyntacticMatches, 64 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3089 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=776, Invalid=2884, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 07:11:27,051 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 40 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 438 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 812 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 438 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:27,051 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 15 Invalid, 812 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [438 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:11:27,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-11-19 07:11:27,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 100. [2022-11-19 07:11:27,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.0707070707070707) internal successors, (106), 99 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) [2022-11-19 07:11:27,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2022-11-19 07:11:27,146 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 70 [2022-11-19 07:11:27,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:27,146 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2022-11-19 07:11:27,146 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) [2022-11-19 07:11:27,146 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2022-11-19 07:11:27,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-19 07:11:27,147 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:27,147 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:11:27,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-19 07:11:27,353 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-19 07:11:27,353 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:11:27,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:27,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1851191820, now seen corresponding path program 35 times [2022-11-19 07:11:27,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:27,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005906544] [2022-11-19 07:11:27,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:27,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:27,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:27,892 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-11-19 07:11:27,892 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:27,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005906544] [2022-11-19 07:11:27,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1005906544] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:27,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590044732] [2022-11-19 07:11:27,893 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:11:27,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:27,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:27,894 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:27,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-19 07:11:28,189 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-19 07:11:28,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:11:28,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-19 07:11:28,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:28,567 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-11-19 07:11:28,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:28,984 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-11-19 07:11:28,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590044732] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:28,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1236492128] [2022-11-19 07:11:28,985 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:11:28,985 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:28,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:28,986 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:28,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:29,037 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:11:29,038 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:11:29,087 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:11:29,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:11:29,111 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 [2022-11-19 07:11:29,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:29,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:29,175 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:11:29,175 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 250 treesize of output 247 [2022-11-19 07:11:29,218 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 [2022-11-19 07:11:29,299 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:29,581 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21317#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:11:29,582 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:29,582 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:29,582 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2022-11-19 07:11:29,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097117771] [2022-11-19 07:11:29,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:29,582 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-19 07:11:29,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:29,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-19 07:11:29,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=473, Invalid=1879, Unknown=0, NotChecked=0, Total=2352 [2022-11-19 07:11:29,583 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 44 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) [2022-11-19 07:11:30,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:30,243 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2022-11-19 07:11:30,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-19 07:11:30,243 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 44 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 [2022-11-19 07:11:30,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:30,244 INFO L225 Difference]: With dead ends: 104 [2022-11-19 07:11:30,244 INFO L226 Difference]: Without dead ends: 75 [2022-11-19 07:11:30,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 168 SyntacticMatches, 26 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1970 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=796, Invalid=3236, Unknown=0, NotChecked=0, Total=4032 [2022-11-19 07:11:30,245 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 503 mSolverCounterSat, 292 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 292 IncrementalHoareTripleChecker+Valid, 503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:30,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 11 Invalid, 795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [292 Valid, 503 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:11:30,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-19 07:11:30,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-11-19 07:11:30,305 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) [2022-11-19 07:11:30,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2022-11-19 07:11:30,306 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 71 [2022-11-19 07:11:30,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:30,306 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2022-11-19 07:11:30,306 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 44 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) [2022-11-19 07:11:30,307 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2022-11-19 07:11:30,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-19 07:11:30,307 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:30,307 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:11:30,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-19 07:11:30,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-19 07:11:30,514 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:11:30,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:30,514 INFO L85 PathProgramCache]: Analyzing trace with hash -1036205414, now seen corresponding path program 36 times [2022-11-19 07:11:30,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:30,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764257112] [2022-11-19 07:11:30,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:30,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:30,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:53,121 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 45 proven. 410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:53,121 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:53,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764257112] [2022-11-19 07:11:53,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764257112] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:53,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727405237] [2022-11-19 07:11:53,122 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:11:53,122 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:53,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:53,123 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:53,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-19 07:11:53,324 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:11:53,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:11:53,329 WARN L261 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 218 conjunts are in the unsatisfiable core [2022-11-19 07:11:53,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:59,516 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 364 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-19 07:11:59,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:10,600 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:12:10,600 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 26 select indices, 26 select index equivalence classes, 0 disjoint index pairs (out of 325 index pairs), introduced 26 new quantified variables, introduced 325 case distinctions, treesize of input 222 treesize of output 1877 [2022-11-19 07:16:14,286 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Maybe an infinite loop [2022-11-19 07:16:14,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [695268226] [2022-11-19 07:16:14,287 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:16:14,287 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:16:14,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:16:14,288 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:16:14,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:16:14,346 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:16:14,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:16:14,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-19 07:16:14,372 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 [2022-11-19 07:16:14,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:16:14,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:16:14,428 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:16:14,428 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 250 treesize of output 247 [2022-11-19 07:16:14,478 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 [2022-11-19 07:16:14,571 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:16:21,572 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22218#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:16:21,573 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:16:21,573 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-19 07:16:21,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73] total 73 [2022-11-19 07:16:21,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977473429] [2022-11-19 07:16:21,573 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-19 07:16:21,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-19 07:16:21,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:16:21,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-19 07:16:21,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=878, Invalid=16678, Unknown=0, NotChecked=0, Total=17556 [2022-11-19 07:16:21,575 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 73 states, 73 states have (on average 1.0136986301369864) internal successors, (74), 73 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) [2022-11-19 07:16:33,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:16:33,005 INFO L93 Difference]: Finished difference Result 126 states and 134 transitions. [2022-11-19 07:16:33,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-19 07:16:33,006 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.0136986301369864) internal successors, (74), 73 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 74 [2022-11-19 07:16:33,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:16:33,007 INFO L225 Difference]: With dead ends: 126 [2022-11-19 07:16:33,007 INFO L226 Difference]: Without dead ends: 123 [2022-11-19 07:16:33,009 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 93 SyntacticMatches, 53 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17612 ImplicationChecksByTransitivity, 34.4s TimeCoverageRelationStatistics Valid=1587, Invalid=25803, Unknown=0, NotChecked=0, Total=27390 [2022-11-19 07:16:33,009 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 23 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 1749 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 1892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 1749 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:16:33,010 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 128 Invalid, 1892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 1749 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-19 07:16:33,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-11-19 07:16:33,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 105. [2022-11-19 07:16:33,126 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) [2022-11-19 07:16:33,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2022-11-19 07:16:33,127 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 74 [2022-11-19 07:16:33,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:16:33,127 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2022-11-19 07:16:33,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.0136986301369864) internal successors, (74), 73 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) [2022-11-19 07:16:33,128 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2022-11-19 07:16:33,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-19 07:16:33,128 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:16:33,129 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:16:33,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-19 07:16:33,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:33,331 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:16:33,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:16:33,331 INFO L85 PathProgramCache]: Analyzing trace with hash 514587228, now seen corresponding path program 37 times [2022-11-19 07:16:33,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:16:33,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230890627] [2022-11-19 07:16:33,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:33,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:16:33,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:16:33,841 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-19 07:16:33,841 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:16:33,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230890627] [2022-11-19 07:16:33,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [230890627] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:16:33,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092553881] [2022-11-19 07:16:33,841 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:16:33,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:33,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:16:33,842 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:16:33,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-19 07:16:34,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:16:34,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-19 07:16:34,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:16:34,449 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-19 07:16:34,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:16:34,794 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-19 07:16:34,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092553881] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:16:34,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1064738765] [2022-11-19 07:16:34,795 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:16:34,795 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:16:34,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:16:34,795 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:16:34,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:16:34,846 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:16:34,847 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:16:34,902 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:16:34,903 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:16:34,924 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 [2022-11-19 07:16:34,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:16:34,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:16:34,976 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:16:34,976 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 250 treesize of output 247 [2022-11-19 07:16:35,015 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 [2022-11-19 07:16:35,114 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:16:36,875 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23225#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:16:36,875 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:16:36,875 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:16:36,875 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2022-11-19 07:16:36,875 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599148492] [2022-11-19 07:16:36,875 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:16:36,876 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-19 07:16:36,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:16:36,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-19 07:16:36,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=2010, Unknown=0, NotChecked=0, Total=2550 [2022-11-19 07:16:36,876 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) [2022-11-19 07:16:37,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:16:37,796 INFO L93 Difference]: Finished difference Result 216 states and 231 transitions. [2022-11-19 07:16:37,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-19 07:16:37,796 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 [2022-11-19 07:16:37,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:16:37,797 INFO L225 Difference]: With dead ends: 216 [2022-11-19 07:16:37,797 INFO L226 Difference]: Without dead ends: 114 [2022-11-19 07:16:37,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 135 SyntacticMatches, 69 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3544 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=883, Invalid=3277, Unknown=0, NotChecked=0, Total=4160 [2022-11-19 07:16:37,799 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 52 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 564 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 989 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 564 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:16:37,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 13 Invalid, 989 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [564 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:16:37,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-11-19 07:16:37,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 107. [2022-11-19 07:16:37,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0660377358490567) internal successors, (113), 106 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) [2022-11-19 07:16:37,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 113 transitions. [2022-11-19 07:16:37,910 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 113 transitions. Word has length 75 [2022-11-19 07:16:37,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:16:37,910 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 113 transitions. [2022-11-19 07:16:37,911 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) [2022-11-19 07:16:37,911 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 113 transitions. [2022-11-19 07:16:37,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-19 07:16:37,911 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:16:37,911 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:16:37,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-19 07:16:38,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-19 07:16:38,112 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:16:38,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:16:38,112 INFO L85 PathProgramCache]: Analyzing trace with hash -1992571131, now seen corresponding path program 38 times [2022-11-19 07:16:38,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:16:38,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274811669] [2022-11-19 07:16:38,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:38,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:16:38,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:16:38,654 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-11-19 07:16:38,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:16:38,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274811669] [2022-11-19 07:16:38,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274811669] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:16:38,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888014445] [2022-11-19 07:16:38,655 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:16:38,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:38,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:16:38,656 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:16:38,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-19 07:16:38,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-19 07:16:38,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:16:38,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-19 07:16:38,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:16:39,360 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-11-19 07:16:39,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:16:39,771 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-11-19 07:16:39,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888014445] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:16:39,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2090341595] [2022-11-19 07:16:39,772 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:16:39,772 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:16:39,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:16:39,773 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:16:39,773 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:16:39,822 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:16:39,822 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:16:39,872 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:16:39,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:16:39,893 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 [2022-11-19 07:16:39,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:16:39,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:16:39,944 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-19 07:16:39,944 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 250 treesize of output 247 [2022-11-19 07:16:39,983 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 [2022-11-19 07:16:40,062 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:16:40,323 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24382#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:16:40,323 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:16:40,323 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:16:40,323 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2022-11-19 07:16:40,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899469842] [2022-11-19 07:16:40,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:16:40,324 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-19 07:16:40,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:16:40,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-19 07:16:40,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=535, Invalid=2117, Unknown=0, NotChecked=0, Total=2652 [2022-11-19 07:16:40,325 INFO L87 Difference]: Start difference. First operand 107 states and 113 transitions. Second operand has 47 states, 47 states have (on average 1.9148936170212767) internal successors, (90), 47 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) [2022-11-19 07:16:41,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:16:41,098 INFO L93 Difference]: Finished difference Result 111 states and 117 transitions. [2022-11-19 07:16:41,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-19 07:16:41,099 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.9148936170212767) internal successors, (90), 47 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 [2022-11-19 07:16:41,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:16:41,099 INFO L225 Difference]: With dead ends: 111 [2022-11-19 07:16:41,099 INFO L226 Difference]: Without dead ends: 80 [2022-11-19 07:16:41,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 180 SyntacticMatches, 28 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2248 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=903, Invalid=3653, Unknown=0, NotChecked=0, Total=4556 [2022-11-19 07:16:41,100 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 632 mSolverCounterSat, 280 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 280 IncrementalHoareTripleChecker+Valid, 632 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:16:41,101 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 17 Invalid, 912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [280 Valid, 632 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:16:41,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-19 07:16:41,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2022-11-19 07:16:41,172 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) [2022-11-19 07:16:41,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2022-11-19 07:16:41,173 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 76 [2022-11-19 07:16:41,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:16:41,173 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2022-11-19 07:16:41,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.9148936170212767) internal successors, (90), 47 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) [2022-11-19 07:16:41,173 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2022-11-19 07:16:41,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-19 07:16:41,174 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:16:41,174 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:16:41,185 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-11-19 07:16:41,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-19 07:16:41,381 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:16:41,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:16:41,381 INFO L85 PathProgramCache]: Analyzing trace with hash -605733079, now seen corresponding path program 39 times [2022-11-19 07:16:41,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:16:41,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048676040] [2022-11-19 07:16:41,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:41,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:16:41,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:17:07,698 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 37 proven. 488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:17:07,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:17:07,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048676040] [2022-11-19 07:17:07,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048676040] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:17:07,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806307102] [2022-11-19 07:17:07,699 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:17:07,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:17:07,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:17:07,700 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:17:07,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbc1a9fc-7bbf-4fbb-8ce1-40fc143fbc90/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-19 07:17:07,957 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:17:07,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:17:07,963 WARN L261 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 236 conjunts are in the unsatisfiable core [2022-11-19 07:17:07,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:17:08,115 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 [2022-11-19 07:17:15,427 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-19 07:17:15,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:17:23,195 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-19 07:17:23,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806307102] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:17:23,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [923615182] [2022-11-19 07:17:23,196 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 07:17:23,196 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:17:23,196 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:17:23,197 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:17:23,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:17:23,244 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-19 07:17:23,245 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-11-19 07:17:23,295 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 07:17:23,295 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 07:17:23,311 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 [2022-11-19 07:17:23,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:17:23,354 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:17:23,377 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-19 07:17:23,377 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 245 treesize of output 248 [2022-11-19 07:17:23,443 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 [2022-11-19 07:17:23,515 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:17:24,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25394#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2022-11-19 07:17:24,539 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:17:24,540 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:17:24,540 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 34, 33] total 137 [2022-11-19 07:17:24,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833996584] [2022-11-19 07:17:24,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:17:24,540 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2022-11-19 07:17:24,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:17:24,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2022-11-19 07:17:24,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=978, Invalid=19044, Unknown=0, NotChecked=0, Total=20022 [2022-11-19 07:17:24,543 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 137 states, 137 states have (on average 1.4963503649635037) internal successors, (205), 137 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)