./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/mlceu.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/mlceu.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0d3cc2e7af8cdfad5003daafcde8bd8bcf193cd0b5d066a7a9bad715ddc9d422 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 08:48:56,351 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 08:48:56,352 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 08:48:56,369 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 08:48:56,370 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 08:48:56,371 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 08:48:56,372 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 08:48:56,373 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 08:48:56,375 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 08:48:56,375 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 08:48:56,376 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 08:48:56,377 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 08:48:56,377 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 08:48:56,378 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 08:48:56,379 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 08:48:56,380 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 08:48:56,381 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 08:48:56,382 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 08:48:56,383 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 08:48:56,385 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 08:48:56,386 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 08:48:56,387 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 08:48:56,388 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 08:48:56,389 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 08:48:56,392 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 08:48:56,392 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 08:48:56,393 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 08:48:56,394 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 08:48:56,394 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 08:48:56,395 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 08:48:56,395 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 08:48:56,396 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 08:48:56,396 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 08:48:56,397 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 08:48:56,398 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 08:48:56,398 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 08:48:56,399 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 08:48:56,399 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 08:48:56,399 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 08:48:56,400 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 08:48:56,400 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 08:48:56,401 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 08:48:56,421 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 08:48:56,421 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 08:48:56,422 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 08:48:56,422 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 08:48:56,428 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 08:48:56,428 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 08:48:56,429 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 08:48:56,429 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 08:48:56,429 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 08:48:56,429 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 08:48:56,430 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 08:48:56,430 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 08:48:56,430 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 08:48:56,430 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 08:48:56,430 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 08:48:56,431 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 08:48:56,431 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 08:48:56,431 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 08:48:56,432 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 08:48:56,432 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 08:48:56,432 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 08:48:56,432 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 08:48:56,432 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 08:48:56,432 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 08:48:56,433 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 08:48:56,433 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 08:48:56,433 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 08:48:56,433 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 08:48:56,433 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 08:48:56,434 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 08:48:56,434 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 08:48:56,434 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 08:48:56,434 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 08:48:56,434 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 08:48:56,435 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 08:48:56,435 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 08:48:56,435 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 08:48:56,435 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 08:48:56,435 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 08:48:56,435 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 08:48:56,436 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 08:48:56,436 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_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0d3cc2e7af8cdfad5003daafcde8bd8bcf193cd0b5d066a7a9bad715ddc9d422 [2022-12-14 08:48:56,629 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 08:48:56,648 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 08:48:56,651 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 08:48:56,652 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 08:48:56,652 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 08:48:56,653 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-tiling/mlceu.c [2022-12-14 08:48:59,232 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 08:48:59,395 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 08:48:59,396 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/sv-benchmarks/c/array-tiling/mlceu.c [2022-12-14 08:48:59,400 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/data/92f17948b/868eacaf1b2a4211b07a4e7e4776080d/FLAG59b3eb20e [2022-12-14 08:48:59,807 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/data/92f17948b/868eacaf1b2a4211b07a4e7e4776080d [2022-12-14 08:48:59,809 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 08:48:59,810 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 08:48:59,811 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 08:48:59,812 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 08:48:59,815 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 08:48:59,816 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:48:59,817 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20017d61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59, skipping insertion in model container [2022-12-14 08:48:59,817 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:48:59,823 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 08:48:59,833 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 08:48:59,932 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/sv-benchmarks/c/array-tiling/mlceu.c[396,409] [2022-12-14 08:48:59,943 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 08:48:59,950 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 08:48:59,959 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/sv-benchmarks/c/array-tiling/mlceu.c[396,409] [2022-12-14 08:48:59,962 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 08:48:59,972 INFO L208 MainTranslator]: Completed translation [2022-12-14 08:48:59,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59 WrapperNode [2022-12-14 08:48:59,973 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 08:48:59,974 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 08:48:59,974 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 08:48:59,974 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 08:48:59,979 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:48:59,985 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:49:00,002 INFO L138 Inliner]: procedures = 16, calls = 21, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 62 [2022-12-14 08:49:00,002 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 08:49:00,003 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 08:49:00,003 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 08:49:00,003 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 08:49:00,010 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:49:00,010 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:49:00,011 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:49:00,012 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:49:00,014 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:49:00,017 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:49:00,017 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:49:00,018 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:49:00,019 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 08:49:00,020 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 08:49:00,020 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 08:49:00,020 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 08:49:00,020 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (1/1) ... [2022-12-14 08:49:00,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 08:49:00,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:00,046 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 08:49:00,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 08:49:00,080 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 08:49:00,081 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 08:49:00,081 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 08:49:00,081 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-12-14 08:49:00,081 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 08:49:00,081 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 08:49:00,081 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 08:49:00,139 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 08:49:00,141 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 08:49:00,234 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 08:49:00,264 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 08:49:00,264 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-12-14 08:49:00,266 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 08:49:00 BoogieIcfgContainer [2022-12-14 08:49:00,266 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 08:49:00,268 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 08:49:00,268 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 08:49:00,270 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 08:49:00,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 08:48:59" (1/3) ... [2022-12-14 08:49:00,271 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70a136c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 08:49:00, skipping insertion in model container [2022-12-14 08:49:00,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:48:59" (2/3) ... [2022-12-14 08:49:00,271 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70a136c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 08:49:00, skipping insertion in model container [2022-12-14 08:49:00,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 08:49:00" (3/3) ... [2022-12-14 08:49:00,273 INFO L112 eAbstractionObserver]: Analyzing ICFG mlceu.c [2022-12-14 08:49:00,287 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 08:49:00,288 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 08:49:00,323 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 08:49:00,328 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;@29f51949, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 08:49:00,328 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 08:49:00,331 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:00,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 08:49:00,336 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:00,336 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 08:49:00,337 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:00,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:00,341 INFO L85 PathProgramCache]: Analyzing trace with hash -1597977046, now seen corresponding path program 1 times [2022-12-14 08:49:00,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:00,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742503422] [2022-12-14 08:49:00,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:00,349 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:00,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:00,545 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:00,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:00,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742503422] [2022-12-14 08:49:00,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742503422] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 08:49:00,547 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 08:49:00,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 08:49:00,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802584084] [2022-12-14 08:49:00,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 08:49:00,554 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 08:49:00,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:00,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 08:49:00,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 08:49:00,577 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 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 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:00,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:00,615 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2022-12-14 08:49:00,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 08:49:00,617 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 08:49:00,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:00,625 INFO L225 Difference]: With dead ends: 18 [2022-12-14 08:49:00,625 INFO L226 Difference]: Without dead ends: 9 [2022-12-14 08:49:00,627 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 08:49:00,631 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:00,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:49:00,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-12-14 08:49:00,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-12-14 08:49:00,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:00,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2022-12-14 08:49:00,662 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2022-12-14 08:49:00,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:00,663 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2022-12-14 08:49:00,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:00,664 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2022-12-14 08:49:00,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 08:49:00,664 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:00,664 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:49:00,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 08:49:00,665 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:00,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:00,666 INFO L85 PathProgramCache]: Analyzing trace with hash 2001362915, now seen corresponding path program 1 times [2022-12-14 08:49:00,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:00,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453010748] [2022-12-14 08:49:00,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:00,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:00,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:01,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:01,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:01,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453010748] [2022-12-14 08:49:01,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453010748] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:01,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454227550] [2022-12-14 08:49:01,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:01,065 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:01,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:01,066 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:01,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 08:49:01,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:01,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 08:49:01,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:01,182 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 11 treesize of output 7 [2022-12-14 08:49:01,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:01,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:01,284 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:01,284 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:01,297 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:01,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:01,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 26 [2022-12-14 08:49:01,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-12-14 08:49:01,356 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:49:01,356 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 20 [2022-12-14 08:49:01,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:01,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454227550] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:01,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1252570779] [2022-12-14 08:49:01,387 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:49:01,388 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:01,391 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:01,396 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:01,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:01,481 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:01,482 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 [2022-12-14 08:49:01,505 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:01,546 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:01,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:01,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:01,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:01,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:01,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:01,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:01,667 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:01,735 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:01,736 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:01,917 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:49:01,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 490 treesize of output 452 [2022-12-14 08:49:01,947 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:01,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 399 treesize of output 398 [2022-12-14 08:49:02,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:02,298 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 [2022-12-14 08:49:02,312 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:02,526 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem8#1| 0) 1 0)) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:02,526 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:02,526 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:02,526 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-12-14 08:49:02,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144656680] [2022-12-14 08:49:02,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:02,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 08:49:02,528 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:02,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 08:49:02,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2022-12-14 08:49:02,529 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:02,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:02,589 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2022-12-14 08:49:02,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 08:49:02,590 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 08:49:02,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:02,590 INFO L225 Difference]: With dead ends: 15 [2022-12-14 08:49:02,590 INFO L226 Difference]: Without dead ends: 13 [2022-12-14 08:49:02,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2022-12-14 08:49:02,592 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 25 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:02,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 12 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:49:02,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-12-14 08:49:02,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2022-12-14 08:49:02,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:02,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-12-14 08:49:02,596 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2022-12-14 08:49:02,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:02,596 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-12-14 08:49:02,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:02,596 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-12-14 08:49:02,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 08:49:02,596 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:02,597 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:49:02,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 08:49:02,797 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:02,798 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:02,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:02,799 INFO L85 PathProgramCache]: Analyzing trace with hash -128267235, now seen corresponding path program 1 times [2022-12-14 08:49:02,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:02,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117345200] [2022-12-14 08:49:02,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:02,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:02,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:02,980 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:02,981 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:02,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117345200] [2022-12-14 08:49:02,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117345200] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:02,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901676716] [2022-12-14 08:49:02,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:02,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:02,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:02,983 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:02,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 08:49:03,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:03,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 08:49:03,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:03,062 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:03,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:03,087 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:03,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901676716] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:03,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641216050] [2022-12-14 08:49:03,089 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:03,090 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:03,090 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:03,090 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:03,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:03,143 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:03,144 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 [2022-12-14 08:49:03,159 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:03,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:03,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:03,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:03,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:03,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:03,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:03,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:03,284 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:03,345 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:03,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:03,437 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:49:03,438 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 490 treesize of output 452 [2022-12-14 08:49:03,459 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:03,460 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 399 treesize of output 398 [2022-12-14 08:49:03,763 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:03,770 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:03,897 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:04,158 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '208#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:04,159 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:04,159 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:04,159 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-12-14 08:49:04,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066696608] [2022-12-14 08:49:04,159 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:04,159 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 08:49:04,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:04,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 08:49:04,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2022-12-14 08:49:04,160 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:04,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:04,185 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2022-12-14 08:49:04,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 08:49:04,186 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 08:49:04,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:04,186 INFO L225 Difference]: With dead ends: 27 [2022-12-14 08:49:04,186 INFO L226 Difference]: Without dead ends: 18 [2022-12-14 08:49:04,186 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2022-12-14 08:49:04,187 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:04,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 16 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:49:04,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-12-14 08:49:04,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2022-12-14 08:49:04,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:04,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2022-12-14 08:49:04,190 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10 [2022-12-14 08:49:04,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:04,190 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2022-12-14 08:49:04,190 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:04,190 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2022-12-14 08:49:04,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 08:49:04,190 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:04,190 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:49:04,195 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 08:49:04,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:04,392 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:04,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:04,393 INFO L85 PathProgramCache]: Analyzing trace with hash 1742920022, now seen corresponding path program 2 times [2022-12-14 08:49:04,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:04,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423680059] [2022-12-14 08:49:04,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:04,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:04,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:04,667 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:04,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:04,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423680059] [2022-12-14 08:49:04,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [423680059] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:04,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [29531220] [2022-12-14 08:49:04,668 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:49:04,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:04,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:04,669 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:04,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 08:49:04,721 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 08:49:04,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:04,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 27 conjunts are in the unsatisfiable core [2022-12-14 08:49:04,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:04,757 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 46 [2022-12-14 08:49:04,764 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2022-12-14 08:49:04,773 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 8 treesize of output 1 [2022-12-14 08:49:04,825 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:04,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:04,872 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:04,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:04,880 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:04,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:04,900 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:49:04,908 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:49:04,908 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:49:04,929 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:04,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [29531220] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:04,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1972506327] [2022-12-14 08:49:04,931 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:04,931 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:04,931 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:04,931 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:04,931 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:04,985 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:49:04,985 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 [2022-12-14 08:49:05,030 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:05,030 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 [2022-12-14 08:49:05,059 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:05,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:05,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:05,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:05,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:05,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:05,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:05,128 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:05,188 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:05,189 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:05,297 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:49:05,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 768 [2022-12-14 08:49:05,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 704 treesize of output 694 [2022-12-14 08:49:05,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:05,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 697 treesize of output 686 [2022-12-14 08:49:05,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 28 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 737 treesize of output 701 [2022-12-14 08:49:05,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:05,868 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:05,967 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:06,247 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '343#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:06,247 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:06,247 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:06,247 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2022-12-14 08:49:06,248 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39198454] [2022-12-14 08:49:06,248 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:06,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 08:49:06,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:06,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 08:49:06,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2022-12-14 08:49:06,249 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:06,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:06,346 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2022-12-14 08:49:06,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 08:49:06,347 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-12-14 08:49:06,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:06,347 INFO L225 Difference]: With dead ends: 19 [2022-12-14 08:49:06,347 INFO L226 Difference]: Without dead ends: 17 [2022-12-14 08:49:06,348 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2022-12-14 08:49:06,348 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:06,349 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 16 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:49:06,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-12-14 08:49:06,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2022-12-14 08:49:06,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:06,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-12-14 08:49:06,352 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-12-14 08:49:06,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:06,352 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-12-14 08:49:06,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:06,352 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-12-14 08:49:06,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 08:49:06,352 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:06,352 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2022-12-14 08:49:06,356 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 08:49:06,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:06,554 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:06,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:06,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1475869130, now seen corresponding path program 3 times [2022-12-14 08:49:06,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:06,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342578747] [2022-12-14 08:49:06,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:06,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:06,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:06,754 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:06,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:06,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342578747] [2022-12-14 08:49:06,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1342578747] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:06,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428532574] [2022-12-14 08:49:06,755 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:49:06,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:06,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:06,756 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:06,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 08:49:06,800 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:49:06,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:06,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 08:49:06,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:06,845 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:06,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:06,876 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:06,876 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1428532574] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:06,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [117432081] [2022-12-14 08:49:06,878 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:06,878 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:06,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:06,878 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:06,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:06,930 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:49:06,931 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 [2022-12-14 08:49:06,973 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:06,973 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 [2022-12-14 08:49:06,994 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:07,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:07,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:07,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:07,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:07,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:07,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:07,078 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:07,126 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:07,127 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:07,310 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:49:07,310 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 776 [2022-12-14 08:49:07,327 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 757 treesize of output 729 [2022-12-14 08:49:07,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 728 treesize of output 718 [2022-12-14 08:49:07,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:07,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 737 treesize of output 726 [2022-12-14 08:49:07,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:07,720 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:07,791 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:08,073 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '497#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:08,073 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:08,073 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:08,073 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-12-14 08:49:08,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7721230] [2022-12-14 08:49:08,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:08,074 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 08:49:08,074 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:08,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 08:49:08,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2022-12-14 08:49:08,075 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:08,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:08,124 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2022-12-14 08:49:08,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 08:49:08,124 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 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 14 [2022-12-14 08:49:08,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:08,125 INFO L225 Difference]: With dead ends: 34 [2022-12-14 08:49:08,125 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 08:49:08,125 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2022-12-14 08:49:08,126 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 14 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:08,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 26 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:49:08,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 08:49:08,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2022-12-14 08:49:08,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:08,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-12-14 08:49:08,131 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2022-12-14 08:49:08,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:08,131 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-12-14 08:49:08,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:08,131 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-12-14 08:49:08,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 08:49:08,132 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:08,132 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2022-12-14 08:49:08,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-12-14 08:49:08,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:08,333 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:08,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:08,334 INFO L85 PathProgramCache]: Analyzing trace with hash 2111095427, now seen corresponding path program 4 times [2022-12-14 08:49:08,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:08,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415732497] [2022-12-14 08:49:08,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:08,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:08,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:08,588 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:08,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:08,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415732497] [2022-12-14 08:49:08,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415732497] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:08,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1129063000] [2022-12-14 08:49:08,589 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:49:08,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:08,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:08,590 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:08,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 08:49:08,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:08,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 08:49:08,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:08,658 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 19 treesize of output 15 [2022-12-14 08:49:08,663 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:49:08,718 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:08,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:08,770 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:08,770 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:08,776 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:08,776 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:08,787 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 30 [2022-12-14 08:49:08,791 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:49:08,799 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:49:08,800 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:49:08,830 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:08,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1129063000] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:08,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1620105529] [2022-12-14 08:49:08,833 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:08,833 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:08,833 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:08,833 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:08,833 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:08,882 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:08,882 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 [2022-12-14 08:49:08,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:08,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:08,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:08,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:08,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:08,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:08,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:08,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:08,992 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:09,047 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:09,048 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:09,391 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:49:09,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 772 [2022-12-14 08:49:09,420 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:09,421 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 739 treesize of output 740 [2022-12-14 08:49:09,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:09,683 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:09,743 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:10,030 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '678#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:10,030 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:10,031 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:10,031 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2022-12-14 08:49:10,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888400608] [2022-12-14 08:49:10,031 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:10,031 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 08:49:10,031 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:10,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 08:49:10,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=478, Unknown=0, NotChecked=0, Total=552 [2022-12-14 08:49:10,032 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:10,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:10,153 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2022-12-14 08:49:10,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 08:49:10,153 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 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) Word has length 15 [2022-12-14 08:49:10,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:10,154 INFO L225 Difference]: With dead ends: 23 [2022-12-14 08:49:10,154 INFO L226 Difference]: Without dead ends: 21 [2022-12-14 08:49:10,154 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2022-12-14 08:49:10,155 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 25 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:10,155 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 35 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:49:10,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-12-14 08:49:10,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2022-12-14 08:49:10,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:10,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-12-14 08:49:10,158 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2022-12-14 08:49:10,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:10,159 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-12-14 08:49:10,159 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:10,159 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-12-14 08:49:10,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 08:49:10,159 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:10,159 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2022-12-14 08:49:10,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-12-14 08:49:10,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 08:49:10,361 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:10,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:10,362 INFO L85 PathProgramCache]: Analyzing trace with hash 442885501, now seen corresponding path program 5 times [2022-12-14 08:49:10,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:10,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823309540] [2022-12-14 08:49:10,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:10,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:10,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:10,481 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:10,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:10,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823309540] [2022-12-14 08:49:10,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [823309540] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:10,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153569264] [2022-12-14 08:49:10,482 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:49:10,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:10,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:10,483 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:10,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 08:49:10,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 08:49:10,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:10,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 08:49:10,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:10,595 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:10,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:10,634 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:10,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153569264] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:10,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [638112624] [2022-12-14 08:49:10,636 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:10,636 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:10,636 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:10,636 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:10,636 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:10,680 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:10,680 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 [2022-12-14 08:49:10,689 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:10,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:49:10,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:10,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:10,736 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 158 treesize of output 128 [2022-12-14 08:49:10,746 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-12-14 08:49:10,794 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:10,799 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:10,844 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:11,052 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '873#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:11,052 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:11,052 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:11,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-12-14 08:49:11,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121986610] [2022-12-14 08:49:11,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:11,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 08:49:11,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:11,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 08:49:11,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2022-12-14 08:49:11,053 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:11,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:11,101 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-12-14 08:49:11,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 08:49:11,101 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-12-14 08:49:11,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:11,102 INFO L225 Difference]: With dead ends: 41 [2022-12-14 08:49:11,102 INFO L226 Difference]: Without dead ends: 26 [2022-12-14 08:49:11,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 32 SyntacticMatches, 11 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2022-12-14 08:49:11,102 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 24 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:11,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 34 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:49:11,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-12-14 08:49:11,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2022-12-14 08:49:11,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:11,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-12-14 08:49:11,105 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2022-12-14 08:49:11,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:11,105 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-12-14 08:49:11,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:11,106 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-12-14 08:49:11,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 08:49:11,106 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:11,106 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2022-12-14 08:49:11,110 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 08:49:11,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:11,307 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:11,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:11,308 INFO L85 PathProgramCache]: Analyzing trace with hash -20076106, now seen corresponding path program 6 times [2022-12-14 08:49:11,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:11,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832036159] [2022-12-14 08:49:11,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:11,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:11,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:11,589 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:11,589 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:11,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832036159] [2022-12-14 08:49:11,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832036159] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:11,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426332504] [2022-12-14 08:49:11,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:49:11,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:11,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:11,590 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:11,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 08:49:11,639 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:49:11,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:11,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 35 conjunts are in the unsatisfiable core [2022-12-14 08:49:11,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:11,669 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 46 [2022-12-14 08:49:11,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2022-12-14 08:49:11,683 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 8 treesize of output 1 [2022-12-14 08:49:11,791 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:11,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:11,870 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:11,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:11,877 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:11,877 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:11,888 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 30 [2022-12-14 08:49:11,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:49:11,899 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:49:11,900 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:49:11,948 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:11,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426332504] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:11,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1189489622] [2022-12-14 08:49:11,950 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:11,950 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:11,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:11,950 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:11,950 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:12,004 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:49:12,004 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 [2022-12-14 08:49:12,047 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:12,048 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 [2022-12-14 08:49:12,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:12,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:12,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:12,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:12,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:12,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:12,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:12,160 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:12,202 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:12,202 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:12,307 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:49:12,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 490 treesize of output 460 [2022-12-14 08:49:12,328 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:12,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 399 treesize of output 398 [2022-12-14 08:49:12,596 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 [2022-12-14 08:49:12,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:12,666 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:12,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1101#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:12,946 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:12,946 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:12,947 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 24 [2022-12-14 08:49:12,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890132885] [2022-12-14 08:49:12,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:12,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 08:49:12,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:12,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 08:49:12,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=768, Unknown=0, NotChecked=0, Total=870 [2022-12-14 08:49:12,949 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:13,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:13,168 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2022-12-14 08:49:13,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 08:49:13,168 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 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) Word has length 19 [2022-12-14 08:49:13,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:13,169 INFO L225 Difference]: With dead ends: 27 [2022-12-14 08:49:13,169 INFO L226 Difference]: Without dead ends: 25 [2022-12-14 08:49:13,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 34 SyntacticMatches, 5 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=192, Invalid=1290, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 08:49:13,170 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 20 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:13,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 52 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:49:13,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-12-14 08:49:13,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2022-12-14 08:49:13,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:13,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2022-12-14 08:49:13,174 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2022-12-14 08:49:13,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:13,174 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2022-12-14 08:49:13,175 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:13,175 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2022-12-14 08:49:13,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 08:49:13,175 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:13,175 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2022-12-14 08:49:13,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 08:49:13,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:13,377 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:13,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:13,378 INFO L85 PathProgramCache]: Analyzing trace with hash -1081684630, now seen corresponding path program 7 times [2022-12-14 08:49:13,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:13,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275952698] [2022-12-14 08:49:13,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:13,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:13,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:13,514 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:13,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:13,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275952698] [2022-12-14 08:49:13,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275952698] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:13,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [616063756] [2022-12-14 08:49:13,515 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:49:13,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:13,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:13,516 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:13,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 08:49:13,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:13,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 08:49:13,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:13,655 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:13,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:13,707 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:13,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [616063756] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:13,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1973604308] [2022-12-14 08:49:13,709 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:13,709 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:13,710 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:13,710 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:13,710 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:13,750 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:13,750 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 [2022-12-14 08:49:13,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:13,782 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:49:13,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:13,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:13,828 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 158 treesize of output 128 [2022-12-14 08:49:13,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-12-14 08:49:13,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:13,867 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:13,910 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:14,186 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1341#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:14,186 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:14,186 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:14,186 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-12-14 08:49:14,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901964032] [2022-12-14 08:49:14,186 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:14,186 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 08:49:14,186 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:14,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 08:49:14,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-12-14 08:49:14,187 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:14,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:14,252 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2022-12-14 08:49:14,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 08:49:14,252 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 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) Word has length 22 [2022-12-14 08:49:14,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:14,253 INFO L225 Difference]: With dead ends: 48 [2022-12-14 08:49:14,253 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 08:49:14,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 40 SyntacticMatches, 14 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=602, Unknown=0, NotChecked=0, Total=756 [2022-12-14 08:49:14,253 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 32 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:14,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 45 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:49:14,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 08:49:14,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2022-12-14 08:49:14,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:14,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-12-14 08:49:14,256 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2022-12-14 08:49:14,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:14,256 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-12-14 08:49:14,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:14,257 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-12-14 08:49:14,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 08:49:14,257 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:14,257 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2022-12-14 08:49:14,261 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 08:49:14,457 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:14,459 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:14,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:14,460 INFO L85 PathProgramCache]: Analyzing trace with hash -443560669, now seen corresponding path program 8 times [2022-12-14 08:49:14,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:14,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610774386] [2022-12-14 08:49:14,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:14,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:14,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:14,726 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:14,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:14,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610774386] [2022-12-14 08:49:14,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610774386] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:14,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581694000] [2022-12-14 08:49:14,727 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:49:14,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:14,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:14,728 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:14,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 08:49:14,823 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 08:49:14,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:14,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 25 conjunts are in the unsatisfiable core [2022-12-14 08:49:14,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:14,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 46 [2022-12-14 08:49:14,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2022-12-14 08:49:15,174 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-12-14 08:49:15,175 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 23 [2022-12-14 08:49:15,190 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 22 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:15,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:15,458 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:15,459 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:15,466 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:15,466 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:15,481 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 26 [2022-12-14 08:49:15,485 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:15,485 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2022-12-14 08:49:15,543 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:15,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581694000] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:15,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [567295691] [2022-12-14 08:49:15,544 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:15,544 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:15,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:15,545 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:15,545 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:15,590 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:49:15,590 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 [2022-12-14 08:49:15,628 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:15,629 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 [2022-12-14 08:49:15,650 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:49:15,671 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:49:15,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,786 INFO L321 Elim1Store]: treesize reduction 261, result has 7.8 percent of original size [2022-12-14 08:49:15,786 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 41 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 16 case distinctions, treesize of input 660 treesize of output 680 [2022-12-14 08:49:15,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:15,831 INFO L321 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2022-12-14 08:49:15,831 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 13 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 2 case distinctions, treesize of input 501 treesize of output 497 [2022-12-14 08:49:15,936 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:49:15,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 507 treesize of output 481 [2022-12-14 08:49:15,945 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 416 treesize of output 395 [2022-12-14 08:49:16,134 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:16,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:16,218 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:16,589 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1619#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:16,589 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:16,589 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:16,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 32 [2022-12-14 08:49:16,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485958668] [2022-12-14 08:49:16,589 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:16,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 08:49:16,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:16,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 08:49:16,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1246, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 08:49:16,590 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 32 states, 32 states have (on average 1.84375) internal successors, (59), 32 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:20,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:20,236 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2022-12-14 08:49:20,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 08:49:20,236 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.84375) internal successors, (59), 32 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) Word has length 23 [2022-12-14 08:49:20,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:20,237 INFO L225 Difference]: With dead ends: 74 [2022-12-14 08:49:20,237 INFO L226 Difference]: Without dead ends: 35 [2022-12-14 08:49:20,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 40 SyntacticMatches, 5 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1477 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=903, Invalid=5573, Unknown=4, NotChecked=0, Total=6480 [2022-12-14 08:49:20,238 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 181 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 61 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:20,238 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 93 Invalid, 401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 339 Invalid, 1 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 08:49:20,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-12-14 08:49:20,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2022-12-14 08:49:20,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:20,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2022-12-14 08:49:20,242 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 23 [2022-12-14 08:49:20,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:20,242 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2022-12-14 08:49:20,243 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.84375) internal successors, (59), 32 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:20,243 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2022-12-14 08:49:20,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-12-14 08:49:20,243 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:20,243 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 5, 5, 1, 1, 1, 1, 1] [2022-12-14 08:49:20,247 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 08:49:20,444 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 08:49:20,445 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:20,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:20,446 INFO L85 PathProgramCache]: Analyzing trace with hash 229555709, now seen corresponding path program 9 times [2022-12-14 08:49:20,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:20,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052618299] [2022-12-14 08:49:20,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:20,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:20,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:20,829 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:20,830 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:20,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052618299] [2022-12-14 08:49:20,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052618299] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:20,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342258265] [2022-12-14 08:49:20,830 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:49:20,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:20,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:20,831 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:20,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 08:49:20,897 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:49:20,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:20,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 47 conjunts are in the unsatisfiable core [2022-12-14 08:49:20,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:20,998 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:49:21,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-12-14 08:49:21,205 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:21,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:21,283 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:49:21,341 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:21,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:21,346 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:21,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:21,360 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 41 [2022-12-14 08:49:21,366 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:49:21,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 45 [2022-12-14 08:49:21,392 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:21,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342258265] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:21,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [742383529] [2022-12-14 08:49:21,393 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:21,393 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:21,393 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:21,394 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:21,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:21,440 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:21,441 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 [2022-12-14 08:49:21,449 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:21,466 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:49:21,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:21,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:21,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 146 treesize of output 116 [2022-12-14 08:49:21,496 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-12-14 08:49:21,538 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:21,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:21,609 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:22,036 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2054#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:22,036 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:22,036 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:22,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 36 [2022-12-14 08:49:22,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470733218] [2022-12-14 08:49:22,037 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:22,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-12-14 08:49:22,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:22,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-12-14 08:49:22,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1479, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 08:49:22,038 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 36 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 36 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:22,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:22,540 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2022-12-14 08:49:22,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 08:49:22,540 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 36 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-12-14 08:49:22,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:22,541 INFO L225 Difference]: With dead ends: 46 [2022-12-14 08:49:22,541 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 08:49:22,541 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 52 SyntacticMatches, 8 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 897 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=352, Invalid=2840, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 08:49:22,542 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 41 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:22,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 103 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 461 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:49:22,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 08:49:22,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 32. [2022-12-14 08:49:22,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:22,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-12-14 08:49:22,546 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 28 [2022-12-14 08:49:22,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:22,547 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-12-14 08:49:22,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 36 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:22,547 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-12-14 08:49:22,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 08:49:22,547 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:22,547 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2022-12-14 08:49:22,551 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 08:49:22,747 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:22,748 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:22,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:22,748 INFO L85 PathProgramCache]: Analyzing trace with hash 1111326659, now seen corresponding path program 10 times [2022-12-14 08:49:22,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:22,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506443499] [2022-12-14 08:49:22,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:22,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:22,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:23,066 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:23,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:23,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506443499] [2022-12-14 08:49:23,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506443499] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:23,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430787181] [2022-12-14 08:49:23,067 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:49:23,067 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:23,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:23,068 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:23,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 08:49:23,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:23,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 08:49:23,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:23,252 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:49:23,489 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:23,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:23,537 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:23,537 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:23,543 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:23,543 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:23,554 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:49:23,559 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:49:23,559 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:49:23,578 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:23,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430787181] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:23,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654365050] [2022-12-14 08:49:23,579 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:23,579 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:23,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:23,580 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:23,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:23,616 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:23,617 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 [2022-12-14 08:49:23,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:23,654 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:49:23,685 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:49:23,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,790 INFO L321 Elim1Store]: treesize reduction 261, result has 7.8 percent of original size [2022-12-14 08:49:23,790 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 41 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 16 case distinctions, treesize of input 712 treesize of output 732 [2022-12-14 08:49:23,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:23,834 INFO L321 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2022-12-14 08:49:23,834 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 19 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 2 case distinctions, treesize of input 517 treesize of output 509 [2022-12-14 08:49:24,026 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:49:24,026 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 507 treesize of output 447 [2022-12-14 08:49:24,033 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 364 treesize of output 358 [2022-12-14 08:49:24,042 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 28 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 405 treesize of output 365 [2022-12-14 08:49:24,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 392 treesize of output 371 [2022-12-14 08:49:24,179 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:24,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:24,255 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:24,615 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2417#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:24,615 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:24,615 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:24,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2022-12-14 08:49:24,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532552729] [2022-12-14 08:49:24,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:24,616 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 08:49:24,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:24,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 08:49:24,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1504, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 08:49:24,618 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 35 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:24,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:24,978 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2022-12-14 08:49:24,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 08:49:24,979 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 35 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 31 [2022-12-14 08:49:24,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:24,979 INFO L225 Difference]: With dead ends: 39 [2022-12-14 08:49:24,979 INFO L226 Difference]: Without dead ends: 37 [2022-12-14 08:49:24,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 482 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=232, Invalid=2318, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 08:49:24,980 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 29 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:24,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 139 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:49:24,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-12-14 08:49:24,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2022-12-14 08:49:24,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:24,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2022-12-14 08:49:24,989 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 31 [2022-12-14 08:49:24,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:24,989 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2022-12-14 08:49:24,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 35 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:24,990 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2022-12-14 08:49:24,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 08:49:24,990 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:24,990 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1] [2022-12-14 08:49:24,995 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 08:49:25,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 08:49:25,191 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:25,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:25,191 INFO L85 PathProgramCache]: Analyzing trace with hash 1929715773, now seen corresponding path program 11 times [2022-12-14 08:49:25,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:25,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733886441] [2022-12-14 08:49:25,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:25,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:25,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:25,412 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:25,412 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:25,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733886441] [2022-12-14 08:49:25,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733886441] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:25,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358656413] [2022-12-14 08:49:25,412 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:49:25,413 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:25,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:25,413 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:25,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 08:49:25,637 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 08:49:25,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:25,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 08:49:25,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:25,796 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:25,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:25,916 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:25,917 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358656413] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:25,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [396264475] [2022-12-14 08:49:25,918 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:25,918 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:25,918 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:25,918 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:25,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:25,956 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:25,956 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 [2022-12-14 08:49:25,965 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:25,982 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:26,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:26,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:26,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:26,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:26,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:26,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:26,035 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:26,089 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:26,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:26,316 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:49:26,316 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 780 [2022-12-14 08:49:26,339 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:26,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 739 treesize of output 740 [2022-12-14 08:49:26,744 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:26,748 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:26,808 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:27,045 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2776#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:27,045 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:27,045 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:27,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-12-14 08:49:27,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437537783] [2022-12-14 08:49:27,046 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:27,046 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 08:49:27,046 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:27,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 08:49:27,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=911, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 08:49:27,047 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:27,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:27,136 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2022-12-14 08:49:27,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 08:49:27,136 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-12-14 08:49:27,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:27,137 INFO L225 Difference]: With dead ends: 69 [2022-12-14 08:49:27,137 INFO L226 Difference]: Without dead ends: 42 [2022-12-14 08:49:27,138 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 71 SyntacticMatches, 15 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=1317, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 08:49:27,139 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 54 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:27,139 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 61 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:49:27,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-12-14 08:49:27,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2022-12-14 08:49:27,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:27,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2022-12-14 08:49:27,148 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 34 [2022-12-14 08:49:27,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:27,148 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2022-12-14 08:49:27,148 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:27,149 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2022-12-14 08:49:27,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 08:49:27,150 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:27,150 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2022-12-14 08:49:27,154 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 08:49:27,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 08:49:27,351 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:27,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:27,351 INFO L85 PathProgramCache]: Analyzing trace with hash -1388883338, now seen corresponding path program 12 times [2022-12-14 08:49:27,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:27,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489038999] [2022-12-14 08:49:27,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:27,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:27,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:27,852 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:27,853 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:27,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489038999] [2022-12-14 08:49:27,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [489038999] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:27,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63945572] [2022-12-14 08:49:27,853 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:49:27,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:27,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:27,854 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:27,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 08:49:27,920 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:49:27,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:27,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 51 conjunts are in the unsatisfiable core [2022-12-14 08:49:27,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:28,043 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:49:28,310 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:28,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:28,398 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:28,398 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:28,405 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:28,405 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:28,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 30 [2022-12-14 08:49:28,419 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:49:28,424 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:49:28,425 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:49:28,446 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:28,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63945572] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:28,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1061021683] [2022-12-14 08:49:28,447 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:28,447 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:28,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:28,447 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:28,447 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:28,491 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:49:28,492 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 [2022-12-14 08:49:28,536 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:28,536 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 [2022-12-14 08:49:28,562 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:28,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:28,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:28,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:28,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:28,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:28,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:28,614 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:28,669 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:28,669 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:28,847 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:49:28,847 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 490 treesize of output 430 [2022-12-14 08:49:28,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:28,856 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 367 treesize of output 356 [2022-12-14 08:49:28,865 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 28 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 407 treesize of output 371 [2022-12-14 08:49:28,877 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 370 treesize of output 360 [2022-12-14 08:49:28,979 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:28,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:29,039 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:29,470 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3190#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:29,470 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:29,470 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:29,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 41 [2022-12-14 08:49:29,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448489793] [2022-12-14 08:49:29,471 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:29,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 08:49:29,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:29,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 08:49:29,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1998, Unknown=0, NotChecked=0, Total=2162 [2022-12-14 08:49:29,472 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 41 states, 41 states have (on average 1.8048780487804879) internal successors, (74), 41 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:29,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:29,898 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2022-12-14 08:49:29,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 08:49:29,898 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.8048780487804879) internal successors, (74), 41 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 35 [2022-12-14 08:49:29,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:29,899 INFO L225 Difference]: With dead ends: 43 [2022-12-14 08:49:29,899 INFO L226 Difference]: Without dead ends: 41 [2022-12-14 08:49:29,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 757 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=308, Invalid=3352, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 08:49:29,901 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 25 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 713 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 723 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:29,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 157 Invalid, 723 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 713 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:49:29,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-12-14 08:49:29,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2022-12-14 08:49:29,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:29,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2022-12-14 08:49:29,909 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 35 [2022-12-14 08:49:29,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:29,909 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2022-12-14 08:49:29,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.8048780487804879) internal successors, (74), 41 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:29,909 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2022-12-14 08:49:29,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 08:49:29,909 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:29,909 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1] [2022-12-14 08:49:29,914 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 08:49:30,110 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:30,110 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:30,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:30,111 INFO L85 PathProgramCache]: Analyzing trace with hash 1496542378, now seen corresponding path program 13 times [2022-12-14 08:49:30,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:30,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634104165] [2022-12-14 08:49:30,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:30,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:30,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:30,355 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:30,355 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:30,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634104165] [2022-12-14 08:49:30,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634104165] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:30,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050454094] [2022-12-14 08:49:30,356 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:49:30,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:30,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:30,357 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:30,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 08:49:30,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:30,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 08:49:30,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:30,569 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:30,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:30,664 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:30,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050454094] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:30,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1564315769] [2022-12-14 08:49:30,665 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:30,665 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:30,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:30,665 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:30,665 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:30,705 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:49:30,705 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 [2022-12-14 08:49:30,737 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:30,738 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 [2022-12-14 08:49:30,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:30,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:30,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:30,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:30,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:30,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:30,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:30,806 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:30,855 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:30,856 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:31,226 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:49:31,226 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 752 [2022-12-14 08:49:31,235 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 688 treesize of output 670 [2022-12-14 08:49:31,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 733 treesize of output 689 [2022-12-14 08:49:31,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:31,261 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 705 treesize of output 694 [2022-12-14 08:49:31,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:31,399 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:31,454 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:31,808 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3596#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:31,808 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:31,808 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:31,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-12-14 08:49:31,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045150318] [2022-12-14 08:49:31,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:31,809 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-12-14 08:49:31,809 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:31,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-12-14 08:49:31,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=1080, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 08:49:31,810 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:31,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:31,965 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2022-12-14 08:49:31,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 08:49:31,965 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 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 38 [2022-12-14 08:49:31,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:31,966 INFO L225 Difference]: With dead ends: 76 [2022-12-14 08:49:31,966 INFO L226 Difference]: Without dead ends: 46 [2022-12-14 08:49:31,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 80 SyntacticMatches, 17 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 825 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=392, Invalid=1588, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 08:49:31,967 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 44 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:31,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 74 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:49:31,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-12-14 08:49:31,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2022-12-14 08:49:31,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:31,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-12-14 08:49:31,973 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2022-12-14 08:49:31,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:31,973 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-12-14 08:49:31,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:31,973 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-12-14 08:49:31,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 08:49:31,973 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:31,973 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2022-12-14 08:49:31,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-12-14 08:49:32,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 08:49:32,174 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:32,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:32,175 INFO L85 PathProgramCache]: Analyzing trace with hash -299902365, now seen corresponding path program 14 times [2022-12-14 08:49:32,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:32,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057528774] [2022-12-14 08:49:32,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:32,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:32,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:32,627 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:32,627 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:32,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057528774] [2022-12-14 08:49:32,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057528774] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:32,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529442491] [2022-12-14 08:49:32,627 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:49:32,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:32,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:32,628 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:32,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 08:49:33,055 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 08:49:33,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:33,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 08:49:33,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:33,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 46 [2022-12-14 08:49:33,181 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2022-12-14 08:49:33,189 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 8 treesize of output 1 [2022-12-14 08:49:34,034 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-12-14 08:49:34,034 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 23 [2022-12-14 08:49:34,055 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 85 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:34,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:34,966 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:34,966 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:34,973 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:34,973 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:34,988 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:34,989 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 47 treesize of output 43 [2022-12-14 08:49:34,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2022-12-14 08:49:35,131 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 84 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:35,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529442491] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:35,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [191783335] [2022-12-14 08:49:35,133 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:35,133 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:35,133 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:35,133 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:35,133 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:35,174 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:35,174 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 [2022-12-14 08:49:35,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:35,203 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:35,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:35,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:35,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:35,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:35,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:35,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:35,253 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:35,300 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:35,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:35,408 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:49:35,409 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 772 [2022-12-14 08:49:35,427 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:35,427 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 739 treesize of output 740 [2022-12-14 08:49:35,944 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:35,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:36,012 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:36,506 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4065#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:36,506 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:36,506 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:36,507 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 54 [2022-12-14 08:49:36,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552739165] [2022-12-14 08:49:36,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:36,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 08:49:36,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:36,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 08:49:36,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=3168, Unknown=1, NotChecked=0, Total=3540 [2022-12-14 08:49:36,508 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 54 states, 54 states have (on average 1.9074074074074074) internal successors, (103), 54 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) [2022-12-14 08:49:43,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:43,506 INFO L93 Difference]: Finished difference Result 114 states and 121 transitions. [2022-12-14 08:49:43,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-12-14 08:49:43,506 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.9074074074074074) internal successors, (103), 54 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 [2022-12-14 08:49:43,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:43,506 INFO L225 Difference]: With dead ends: 114 [2022-12-14 08:49:43,506 INFO L226 Difference]: Without dead ends: 51 [2022-12-14 08:49:43,509 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 70 SyntacticMatches, 9 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4203 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=2020, Invalid=15528, Unknown=8, NotChecked=0, Total=17556 [2022-12-14 08:49:43,509 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 341 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 864 mSolverCounterSat, 143 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 1008 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 864 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:43,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [341 Valid, 57 Invalid, 1008 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 864 Invalid, 1 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 08:49:43,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-12-14 08:49:43,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 45. [2022-12-14 08:49:43,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:43,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2022-12-14 08:49:43,520 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 39 [2022-12-14 08:49:43,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:43,521 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2022-12-14 08:49:43,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.9074074074074074) internal successors, (103), 54 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) [2022-12-14 08:49:43,521 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2022-12-14 08:49:43,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 08:49:43,521 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:43,521 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 9, 9, 1, 1, 1, 1, 1] [2022-12-14 08:49:43,526 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 08:49:43,722 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 08:49:43,722 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:43,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:43,722 INFO L85 PathProgramCache]: Analyzing trace with hash -256743235, now seen corresponding path program 15 times [2022-12-14 08:49:43,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:43,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905496563] [2022-12-14 08:49:43,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:43,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:43,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:44,215 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:44,215 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:44,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905496563] [2022-12-14 08:49:44,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1905496563] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:44,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [573378188] [2022-12-14 08:49:44,215 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:49:44,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:44,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:44,216 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:44,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 08:49:44,288 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:49:44,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:44,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 08:49:44,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:44,448 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:49:44,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 53 [2022-12-14 08:49:44,484 INFO L321 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2022-12-14 08:49:44,485 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 24 [2022-12-14 08:49:44,901 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:44,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:45,000 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:49:45,043 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:45,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:45,051 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:45,051 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:45,066 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 58 [2022-12-14 08:49:45,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2022-12-14 08:49:45,082 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 44 [2022-12-14 08:49:45,088 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:49:45,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 45 [2022-12-14 08:49:45,119 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:45,120 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [573378188] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:45,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1530094728] [2022-12-14 08:49:45,121 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:45,121 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:45,121 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:45,121 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:45,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:45,159 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:49:45,159 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 [2022-12-14 08:49:45,196 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:45,197 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 [2022-12-14 08:49:45,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:45,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:45,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:45,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:45,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:45,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:45,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:45,274 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:45,323 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:45,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:45,656 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:49:45,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 756 [2022-12-14 08:49:45,674 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:45,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 739 treesize of output 740 [2022-12-14 08:49:45,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:45,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:45,959 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:46,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4752#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:46,391 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:46,391 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:46,391 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 52 [2022-12-14 08:49:46,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499887967] [2022-12-14 08:49:46,392 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:46,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 08:49:46,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:46,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 08:49:46,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=3067, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 08:49:46,393 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 52 states, 52 states have (on average 1.8076923076923077) internal successors, (94), 52 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:47,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:47,082 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2022-12-14 08:49:47,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-12-14 08:49:47,082 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.8076923076923077) internal successors, (94), 52 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-12-14 08:49:47,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:47,083 INFO L225 Difference]: With dead ends: 62 [2022-12-14 08:49:47,083 INFO L226 Difference]: Without dead ends: 60 [2022-12-14 08:49:47,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1420 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=577, Invalid=5743, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 08:49:47,084 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 65 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 1039 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 1062 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1039 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:47,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 268 Invalid, 1062 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1039 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:49:47,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-12-14 08:49:47,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 48. [2022-12-14 08:49:47,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:47,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-12-14 08:49:47,092 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2022-12-14 08:49:47,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:47,092 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-12-14 08:49:47,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.8076923076923077) internal successors, (94), 52 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:47,092 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-12-14 08:49:47,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 08:49:47,092 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:47,093 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2022-12-14 08:49:47,097 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 08:49:47,293 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 08:49:47,293 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:47,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:47,294 INFO L85 PathProgramCache]: Analyzing trace with hash 704175363, now seen corresponding path program 16 times [2022-12-14 08:49:47,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:47,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770758439] [2022-12-14 08:49:47,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:47,295 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:47,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:47,803 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:47,803 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:47,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770758439] [2022-12-14 08:49:47,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770758439] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:47,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760877331] [2022-12-14 08:49:47,803 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:49:47,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:47,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:47,804 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:47,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 08:49:47,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:47,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 08:49:47,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:48,095 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:49:48,515 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:48,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:48,597 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:48,597 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:48,603 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:48,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:48,613 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 30 [2022-12-14 08:49:48,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:49:48,624 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:49:48,624 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:49:48,656 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:48,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760877331] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:48,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1456939657] [2022-12-14 08:49:48,658 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:48,658 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:48,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:48,658 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:48,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:48,703 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:48,703 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 [2022-12-14 08:49:48,717 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:48,736 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:48,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:48,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:48,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:48,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:48,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:48,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:48,794 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:48,852 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:48,853 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:48,949 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:49:48,949 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 490 treesize of output 438 [2022-12-14 08:49:48,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:48,959 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 375 treesize of output 364 [2022-12-14 08:49:48,971 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 415 treesize of output 383 [2022-12-14 08:49:48,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 382 treesize of output 376 [2022-12-14 08:49:49,155 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:49,160 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:49,224 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:49,776 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5288#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:49,776 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:49,776 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:49,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2022-12-14 08:49:49,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969808336] [2022-12-14 08:49:49,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:49,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-12-14 08:49:49,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:49,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-12-14 08:49:49,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=3000, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 08:49:49,778 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 51 states, 51 states have (on average 1.8823529411764706) internal successors, (96), 51 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:50,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:50,473 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2022-12-14 08:49:50,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 08:49:50,473 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.8823529411764706) internal successors, (96), 51 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2022-12-14 08:49:50,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:50,474 INFO L225 Difference]: With dead ends: 55 [2022-12-14 08:49:50,474 INFO L226 Difference]: Without dead ends: 53 [2022-12-14 08:49:50,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 928 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=328, Invalid=4642, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 08:49:50,475 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 33 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 1156 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 1169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:50,475 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 335 Invalid, 1169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1156 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:49:50,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-12-14 08:49:50,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2022-12-14 08:49:50,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:50,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-12-14 08:49:50,485 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 47 [2022-12-14 08:49:50,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:50,485 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-12-14 08:49:50,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.8823529411764706) internal successors, (96), 51 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:50,485 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-12-14 08:49:50,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 08:49:50,485 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:50,486 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1] [2022-12-14 08:49:50,490 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 08:49:50,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 08:49:50,687 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:50,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:50,688 INFO L85 PathProgramCache]: Analyzing trace with hash 1473100541, now seen corresponding path program 17 times [2022-12-14 08:49:50,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:50,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801035882] [2022-12-14 08:49:50,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:50,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:50,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:51,078 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:51,078 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:51,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801035882] [2022-12-14 08:49:51,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801035882] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:51,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039402041] [2022-12-14 08:49:51,078 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:49:51,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:51,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:51,079 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:51,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 08:49:52,073 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-12-14 08:49:52,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:52,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 08:49:52,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:52,267 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:52,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:52,410 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:52,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039402041] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:52,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1530082873] [2022-12-14 08:49:52,410 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:52,411 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:52,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:52,411 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:52,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:52,449 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:49:52,450 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 [2022-12-14 08:49:52,486 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:52,486 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 [2022-12-14 08:49:52,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:52,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:52,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:52,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:52,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:52,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:52,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:52,554 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:52,596 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:52,597 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:52,987 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:49:52,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 770 [2022-12-14 08:49:53,009 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:53,009 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 737 treesize of output 736 [2022-12-14 08:49:53,182 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:53,187 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:53,259 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:53,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5811#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:53,664 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:53,664 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:53,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2022-12-14 08:49:53,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389727868] [2022-12-14 08:49:53,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:53,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 08:49:53,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:53,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 08:49:53,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=1671, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 08:49:53,666 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:53,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:53,901 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2022-12-14 08:49:53,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 08:49:53,901 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 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) Word has length 50 [2022-12-14 08:49:53,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:53,902 INFO L225 Difference]: With dead ends: 97 [2022-12-14 08:49:53,902 INFO L226 Difference]: Without dead ends: 58 [2022-12-14 08:49:53,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 107 SyntacticMatches, 23 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1338 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=641, Invalid=2551, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 08:49:53,903 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 102 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:53,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 108 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:49:53,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-12-14 08:49:53,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 52. [2022-12-14 08:49:53,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 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) [2022-12-14 08:49:53,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-12-14 08:49:53,913 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2022-12-14 08:49:53,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:53,913 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-12-14 08:49:53,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:53,913 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-12-14 08:49:53,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-12-14 08:49:53,914 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:53,914 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2022-12-14 08:49:53,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-12-14 08:49:54,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:54,115 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:54,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:54,116 INFO L85 PathProgramCache]: Analyzing trace with hash 288250678, now seen corresponding path program 18 times [2022-12-14 08:49:54,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:54,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058111550] [2022-12-14 08:49:54,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:54,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:54,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:54,645 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:54,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:54,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058111550] [2022-12-14 08:49:54,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058111550] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:54,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2049432907] [2022-12-14 08:49:54,645 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:49:54,645 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:54,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:54,646 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:54,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 08:49:54,742 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:49:54,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:54,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 67 conjunts are in the unsatisfiable core [2022-12-14 08:49:54,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:55,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:49:55,727 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:55,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:55,865 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:55,866 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:49:55,872 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:55,873 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:49:55,883 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 30 [2022-12-14 08:49:55,889 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:49:55,895 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:49:55,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:49:55,933 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:55,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2049432907] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:55,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1463912566] [2022-12-14 08:49:55,934 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:55,935 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:55,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:55,935 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:55,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:55,985 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:49:55,986 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 [2022-12-14 08:49:56,030 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:56,031 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 [2022-12-14 08:49:56,055 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:49:56,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:56,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:56,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:56,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:56,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:56,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:56,111 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:49:56,176 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:49:56,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:49:56,353 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:49:56,354 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 490 treesize of output 440 [2022-12-14 08:49:56,367 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:56,367 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 399 treesize of output 398 [2022-12-14 08:49:56,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:56,533 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:56,598 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:57,184 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6409#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:57,185 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:57,185 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:57,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 57 [2022-12-14 08:49:57,185 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237602906] [2022-12-14 08:49:57,185 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:57,185 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-12-14 08:49:57,185 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:57,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-12-14 08:49:57,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=3684, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 08:49:57,187 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 57 states, 57 states have (on average 1.8245614035087718) internal successors, (104), 57 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:58,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:58,090 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2022-12-14 08:49:58,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-12-14 08:49:58,090 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.8245614035087718) internal successors, (104), 57 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-12-14 08:49:58,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:58,090 INFO L225 Difference]: With dead ends: 59 [2022-12-14 08:49:58,090 INFO L226 Difference]: Without dead ends: 57 [2022-12-14 08:49:58,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1255 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=393, Invalid=5927, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 08:49:58,092 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 25 mSDsluCounter, 416 mSDsCounter, 0 mSdLazyCounter, 1654 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 428 SdHoareTripleChecker+Invalid, 1668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1654 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:58,092 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 428 Invalid, 1668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1654 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 08:49:58,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-12-14 08:49:58,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2022-12-14 08:49:58,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:58,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2022-12-14 08:49:58,102 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 51 [2022-12-14 08:49:58,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:58,103 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2022-12-14 08:49:58,103 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.8245614035087718) internal successors, (104), 57 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:58,103 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2022-12-14 08:49:58,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-12-14 08:49:58,103 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:58,103 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1] [2022-12-14 08:49:58,108 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 08:49:58,304 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:58,305 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:58,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:58,306 INFO L85 PathProgramCache]: Analyzing trace with hash 1641458666, now seen corresponding path program 19 times [2022-12-14 08:49:58,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:58,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248756660] [2022-12-14 08:49:58,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:58,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:58,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:58,671 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:58,671 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:58,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248756660] [2022-12-14 08:49:58,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248756660] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:58,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656356097] [2022-12-14 08:49:58,672 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:49:58,672 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:58,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:58,673 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:58,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 08:49:58,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:58,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 08:49:58,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:58,990 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:58,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:59,147 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:59,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656356097] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:59,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1060257697] [2022-12-14 08:49:59,148 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:49:59,149 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:59,149 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:59,149 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:59,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:59,182 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:49:59,182 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 [2022-12-14 08:49:59,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:49:59,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:49:59,228 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:49:59,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,333 INFO L321 Elim1Store]: treesize reduction 261, result has 7.8 percent of original size [2022-12-14 08:49:59,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 41 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 16 case distinctions, treesize of input 712 treesize of output 732 [2022-12-14 08:49:59,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:49:59,371 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:49:59,371 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 14 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 517 treesize of output 509 [2022-12-14 08:49:59,602 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:49:59,602 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 507 treesize of output 449 [2022-12-14 08:49:59,610 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 16 [2022-12-14 08:49:59,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 411 treesize of output 375 [2022-12-14 08:49:59,633 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 382 treesize of output 372 [2022-12-14 08:49:59,694 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:59,698 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:49:59,754 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:00,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6977#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:00,069 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:00,069 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:00,069 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-12-14 08:50:00,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905117496] [2022-12-14 08:50:00,070 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:00,070 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-12-14 08:50:00,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:00,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-12-14 08:50:00,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=456, Invalid=1896, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 08:50:00,071 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 43 states, 43 states have (on average 2.2790697674418605) internal successors, (98), 43 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:00,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:00,273 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2022-12-14 08:50:00,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 08:50:00,274 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.2790697674418605) internal successors, (98), 43 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2022-12-14 08:50:00,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:00,274 INFO L225 Difference]: With dead ends: 104 [2022-12-14 08:50:00,274 INFO L226 Difference]: Without dead ends: 62 [2022-12-14 08:50:00,274 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 116 SyntacticMatches, 25 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1535 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=738, Invalid=2922, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 08:50:00,275 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 124 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:00,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 119 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:50:00,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-12-14 08:50:00,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 56. [2022-12-14 08:50:00,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:00,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-12-14 08:50:00,284 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 54 [2022-12-14 08:50:00,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:00,285 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-12-14 08:50:00,285 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.2790697674418605) internal successors, (98), 43 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:00,285 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-12-14 08:50:00,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-12-14 08:50:00,285 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:00,285 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1] [2022-12-14 08:50:00,289 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 08:50:00,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-12-14 08:50:00,486 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:00,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:00,487 INFO L85 PathProgramCache]: Analyzing trace with hash 1024100259, now seen corresponding path program 20 times [2022-12-14 08:50:00,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:00,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345411520] [2022-12-14 08:50:00,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:00,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:00,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:01,262 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:01,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:01,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345411520] [2022-12-14 08:50:01,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345411520] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:01,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691592606] [2022-12-14 08:50:01,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:50:01,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:01,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:01,263 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:01,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 08:50:04,764 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-12-14 08:50:04,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:50:04,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 41 conjunts are in the unsatisfiable core [2022-12-14 08:50:04,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:04,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 46 [2022-12-14 08:50:04,964 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2022-12-14 08:50:04,970 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 8 treesize of output 1 [2022-12-14 08:50:05,871 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-12-14 08:50:05,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 23 [2022-12-14 08:50:05,894 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 210 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:05,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:06,877 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:06,877 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:50:06,886 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:06,886 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:50:06,900 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 26 [2022-12-14 08:50:06,905 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:06,905 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2022-12-14 08:50:07,117 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 198 proven. 115 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:07,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691592606] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:07,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1105185135] [2022-12-14 08:50:07,118 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:50:07,118 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:07,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:07,119 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:07,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:07,162 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:50:07,163 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 [2022-12-14 08:50:07,172 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:50:07,194 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:50:07,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:07,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:07,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:07,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:07,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:07,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:07,255 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:50:07,325 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:50:07,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:50:07,403 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:50:07,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 490 treesize of output 456 [2022-12-14 08:50:07,422 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:07,422 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 399 treesize of output 398 [2022-12-14 08:50:07,641 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:07,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:07,711 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:08,268 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7632#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:08,268 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:08,268 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:08,268 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 72 [2022-12-14 08:50:08,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922850062] [2022-12-14 08:50:08,268 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:08,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-12-14 08:50:08,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:08,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-12-14 08:50:08,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=738, Invalid=5268, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 08:50:08,269 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 72 states, 72 states have (on average 2.0416666666666665) internal successors, (147), 72 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:10,929 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-12-14 08:50:13,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:13,567 INFO L93 Difference]: Finished difference Result 154 states and 161 transitions. [2022-12-14 08:50:13,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-12-14 08:50:13,571 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 2.0416666666666665) internal successors, (147), 72 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2022-12-14 08:50:13,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:13,572 INFO L225 Difference]: With dead ends: 154 [2022-12-14 08:50:13,572 INFO L226 Difference]: Without dead ends: 67 [2022-12-14 08:50:13,574 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 104 SyntacticMatches, 13 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7881 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=2925, Invalid=23807, Unknown=0, NotChecked=0, Total=26732 [2022-12-14 08:50:13,574 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 123 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 987 mSolverCounterSat, 51 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 1039 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 987 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:13,575 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 302 Invalid, 1039 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 987 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2022-12-14 08:50:13,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-12-14 08:50:13,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2022-12-14 08:50:13,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:13,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2022-12-14 08:50:13,594 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 55 [2022-12-14 08:50:13,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:13,595 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2022-12-14 08:50:13,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 2.0416666666666665) internal successors, (147), 72 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:13,595 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2022-12-14 08:50:13,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-12-14 08:50:13,595 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:13,595 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 13, 13, 1, 1, 1, 1, 1] [2022-12-14 08:50:13,602 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 08:50:13,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:13,796 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:13,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:13,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1403554947, now seen corresponding path program 21 times [2022-12-14 08:50:13,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:13,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082560808] [2022-12-14 08:50:13,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:13,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:13,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:14,613 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:14,613 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:14,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082560808] [2022-12-14 08:50:14,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082560808] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:14,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532904722] [2022-12-14 08:50:14,613 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:50:14,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:14,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:14,614 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:14,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 08:50:14,730 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:50:14,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:50:14,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 79 conjunts are in the unsatisfiable core [2022-12-14 08:50:14,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:15,144 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:50:15,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:15,192 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-12-14 08:50:15,951 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:15,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:16,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:50:16,171 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:16,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:50:16,176 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:16,176 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:50:16,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 41 [2022-12-14 08:50:16,194 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:50:16,194 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 45 [2022-12-14 08:50:16,237 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:16,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532904722] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:16,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1956829018] [2022-12-14 08:50:16,239 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:50:16,239 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:16,239 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:16,239 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:16,240 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:16,285 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:50:16,285 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 [2022-12-14 08:50:16,293 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:50:16,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:50:16,324 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:50:16,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,442 INFO L321 Elim1Store]: treesize reduction 261, result has 7.8 percent of original size [2022-12-14 08:50:16,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 41 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 16 case distinctions, treesize of input 675 treesize of output 695 [2022-12-14 08:50:16,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:16,489 INFO L321 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2022-12-14 08:50:16,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 19 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 2 case distinctions, treesize of input 516 treesize of output 510 [2022-12-14 08:50:16,632 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:50:16,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 507 treesize of output 461 [2022-12-14 08:50:16,641 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 16 [2022-12-14 08:50:16,650 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 423 treesize of output 395 [2022-12-14 08:50:16,663 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 386 treesize of output 380 [2022-12-14 08:50:16,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:16,828 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:16,887 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:17,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8537#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:17,336 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:17,336 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:17,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 34, 34] total 68 [2022-12-14 08:50:17,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941022537] [2022-12-14 08:50:17,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:17,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-12-14 08:50:17,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:17,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-12-14 08:50:17,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=5109, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 08:50:17,338 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 68 states, 68 states have (on average 1.8235294117647058) internal successors, (124), 68 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:18,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:18,655 INFO L93 Difference]: Finished difference Result 78 states and 80 transitions. [2022-12-14 08:50:18,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-12-14 08:50:18,655 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.8235294117647058) internal successors, (124), 68 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-12-14 08:50:18,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:18,655 INFO L225 Difference]: With dead ends: 78 [2022-12-14 08:50:18,655 INFO L226 Difference]: Without dead ends: 76 [2022-12-14 08:50:18,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2023 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=604, Invalid=8902, Unknown=0, NotChecked=0, Total=9506 [2022-12-14 08:50:18,656 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 67 mSDsluCounter, 531 mSDsCounter, 0 mSdLazyCounter, 1915 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 546 SdHoareTripleChecker+Invalid, 1940 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 1915 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:18,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 546 Invalid, 1940 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 1915 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 08:50:18,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-12-14 08:50:18,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 64. [2022-12-14 08:50:18,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:18,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-12-14 08:50:18,674 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2022-12-14 08:50:18,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:18,675 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-12-14 08:50:18,675 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.8235294117647058) internal successors, (124), 68 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:18,675 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-12-14 08:50:18,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-12-14 08:50:18,675 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:18,675 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2022-12-14 08:50:18,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-12-14 08:50:18,876 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 08:50:18,876 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:18,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:18,877 INFO L85 PathProgramCache]: Analyzing trace with hash -1793664445, now seen corresponding path program 22 times [2022-12-14 08:50:18,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:18,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862649974] [2022-12-14 08:50:18,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:18,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:18,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:19,729 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:19,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:19,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862649974] [2022-12-14 08:50:19,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862649974] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:19,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425333891] [2022-12-14 08:50:19,729 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:50:19,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:19,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:19,730 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:19,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 08:50:19,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:19,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-14 08:50:19,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:20,251 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:50:21,026 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:21,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:21,127 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:21,127 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:50:21,133 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:21,133 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:50:21,142 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 30 [2022-12-14 08:50:21,144 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:50:21,151 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:50:21,152 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:50:21,194 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:21,194 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425333891] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:21,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1234612023] [2022-12-14 08:50:21,195 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:50:21,195 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:21,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:21,195 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:21,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:21,236 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:50:21,236 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 [2022-12-14 08:50:21,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:50:21,262 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:50:21,293 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:50:21,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,405 INFO L321 Elim1Store]: treesize reduction 261, result has 7.8 percent of original size [2022-12-14 08:50:21,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 41 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 16 case distinctions, treesize of input 716 treesize of output 736 [2022-12-14 08:50:21,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:21,455 INFO L321 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2022-12-14 08:50:21,456 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 26 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 2 case distinctions, treesize of input 539 treesize of output 529 [2022-12-14 08:50:21,610 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:50:21,611 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 507 treesize of output 465 [2022-12-14 08:50:21,629 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 416 treesize of output 395 [2022-12-14 08:50:21,833 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:21,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:21,901 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:22,467 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9237#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:22,467 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:22,467 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:22,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2022-12-14 08:50:22,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504978280] [2022-12-14 08:50:22,467 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:22,468 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-12-14 08:50:22,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:22,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-12-14 08:50:22,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=5008, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 08:50:22,469 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 67 states, 67 states have (on average 1.9104477611940298) internal successors, (128), 67 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) [2022-12-14 08:50:23,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:23,524 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2022-12-14 08:50:23,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-12-14 08:50:23,525 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.9104477611940298) internal successors, (128), 67 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 63 [2022-12-14 08:50:23,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:23,525 INFO L225 Difference]: With dead ends: 71 [2022-12-14 08:50:23,525 INFO L226 Difference]: Without dead ends: 69 [2022-12-14 08:50:23,526 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 148 SyntacticMatches, 2 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1518 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=424, Invalid=7766, Unknown=0, NotChecked=0, Total=8190 [2022-12-14 08:50:23,526 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 35 mSDsluCounter, 665 mSDsCounter, 0 mSdLazyCounter, 2230 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 681 SdHoareTripleChecker+Invalid, 2247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:23,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 681 Invalid, 2247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2230 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 08:50:23,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-12-14 08:50:23,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2022-12-14 08:50:23,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:23,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2022-12-14 08:50:23,539 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 63 [2022-12-14 08:50:23,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:23,540 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2022-12-14 08:50:23,540 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.9104477611940298) internal successors, (128), 67 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) [2022-12-14 08:50:23,540 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2022-12-14 08:50:23,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-12-14 08:50:23,540 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:23,540 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1] [2022-12-14 08:50:23,545 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 08:50:23,741 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 08:50:23,741 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:23,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:23,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1364216387, now seen corresponding path program 23 times [2022-12-14 08:50:23,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:23,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136716260] [2022-12-14 08:50:23,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:23,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:23,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:24,245 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:24,245 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:24,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136716260] [2022-12-14 08:50:24,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136716260] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:24,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902347101] [2022-12-14 08:50:24,245 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:50:24,246 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:24,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:24,246 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:24,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 08:50:33,955 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-12-14 08:50:33,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:50:33,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 08:50:33,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:34,319 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:34,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:34,546 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:34,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902347101] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:34,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1950180420] [2022-12-14 08:50:34,547 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:50:34,547 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:34,548 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:34,548 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:34,548 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:34,588 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:50:34,588 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 [2022-12-14 08:50:34,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:50:34,613 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:50:34,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:34,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:34,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:34,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:34,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:34,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:34,671 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:50:34,717 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:50:34,718 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:50:35,116 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:50:35,116 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 780 [2022-12-14 08:50:35,137 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:35,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 739 treesize of output 740 [2022-12-14 08:50:35,262 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:35,266 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 [2022-12-14 08:50:35,328 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:35,629 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9924#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:35,629 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:35,629 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:35,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2022-12-14 08:50:35,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390868864] [2022-12-14 08:50:35,630 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:35,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 08:50:35,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:35,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 08:50:35,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=2655, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 08:50:35,631 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:35,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:35,888 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2022-12-14 08:50:35,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 08:50:35,888 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2022-12-14 08:50:35,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:35,888 INFO L225 Difference]: With dead ends: 125 [2022-12-14 08:50:35,888 INFO L226 Difference]: Without dead ends: 74 [2022-12-14 08:50:35,889 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 143 SyntacticMatches, 31 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2204 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1071, Invalid=4185, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 08:50:35,889 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 218 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:35,889 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 108 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:50:35,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-12-14 08:50:35,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2022-12-14 08:50:35,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:35,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2022-12-14 08:50:35,903 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 66 [2022-12-14 08:50:35,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:35,903 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2022-12-14 08:50:35,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:35,903 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2022-12-14 08:50:35,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-12-14 08:50:35,904 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:35,904 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1] [2022-12-14 08:50:35,913 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 08:50:36,104 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:36,105 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:36,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:36,105 INFO L85 PathProgramCache]: Analyzing trace with hash -928857098, now seen corresponding path program 24 times [2022-12-14 08:50:36,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:36,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994141222] [2022-12-14 08:50:36,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:36,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:36,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:37,087 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:37,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:37,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994141222] [2022-12-14 08:50:37,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994141222] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:37,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210559217] [2022-12-14 08:50:37,088 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:50:37,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:37,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:37,089 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:37,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 08:50:37,207 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:50:37,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:50:37,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 83 conjunts are in the unsatisfiable core [2022-12-14 08:50:37,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:37,637 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:50:38,469 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:38,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:38,599 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:38,599 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:50:38,605 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:38,605 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:50:38,617 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 30 [2022-12-14 08:50:38,622 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:50:38,628 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:50:38,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:50:38,668 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:38,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210559217] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:38,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [610531442] [2022-12-14 08:50:38,669 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:50:38,669 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:38,669 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:38,669 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:38,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:38,711 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:50:38,711 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 [2022-12-14 08:50:38,739 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:50:38,740 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 [2022-12-14 08:50:38,757 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:50:38,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:38,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:38,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:38,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:38,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:38,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:38,806 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:50:38,854 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:50:38,854 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:50:39,248 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:50:39,248 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 796 [2022-12-14 08:50:39,266 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:39,266 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 739 treesize of output 740 [2022-12-14 08:50:39,411 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:39,416 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:39,468 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:40,147 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10706#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:40,147 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:40,147 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:40,147 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 37] total 73 [2022-12-14 08:50:40,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723569161] [2022-12-14 08:50:40,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:40,148 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-12-14 08:50:40,148 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:40,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-12-14 08:50:40,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=5884, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 08:50:40,149 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 73 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 73 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:41,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:41,563 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2022-12-14 08:50:41,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-12-14 08:50:41,564 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 73 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2022-12-14 08:50:41,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:41,564 INFO L225 Difference]: With dead ends: 75 [2022-12-14 08:50:41,564 INFO L226 Difference]: Without dead ends: 73 [2022-12-14 08:50:41,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1929 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=489, Invalid=9411, Unknown=0, NotChecked=0, Total=9900 [2022-12-14 08:50:41,565 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 34 mSDsluCounter, 639 mSDsCounter, 0 mSdLazyCounter, 2363 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 655 SdHoareTripleChecker+Invalid, 2382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 2363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:41,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 655 Invalid, 2382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 2363 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 08:50:41,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-12-14 08:50:41,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2022-12-14 08:50:41,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:41,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2022-12-14 08:50:41,580 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 67 [2022-12-14 08:50:41,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:41,580 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2022-12-14 08:50:41,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 73 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:41,580 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2022-12-14 08:50:41,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-12-14 08:50:41,581 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:41,581 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1, 1] [2022-12-14 08:50:41,585 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 08:50:41,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 08:50:41,782 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:41,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:41,783 INFO L85 PathProgramCache]: Analyzing trace with hash 897616682, now seen corresponding path program 25 times [2022-12-14 08:50:41,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:41,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036857031] [2022-12-14 08:50:41,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:41,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:41,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:42,328 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 346 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:42,328 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:42,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036857031] [2022-12-14 08:50:42,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2036857031] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:42,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407597901] [2022-12-14 08:50:42,328 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:50:42,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:42,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:42,329 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:42,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 08:50:42,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:42,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 08:50:42,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:42,893 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:42,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:43,264 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:43,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407597901] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:43,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1224530682] [2022-12-14 08:50:43,265 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:50:43,265 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:43,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:43,266 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:43,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:43,303 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:50:43,303 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 [2022-12-14 08:50:43,310 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:50:43,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:50:43,349 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:50:43,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,466 INFO L321 Elim1Store]: treesize reduction 261, result has 7.8 percent of original size [2022-12-14 08:50:43,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 41 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 16 case distinctions, treesize of input 701 treesize of output 721 [2022-12-14 08:50:43,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:43,513 INFO L321 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2022-12-14 08:50:43,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 26 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 2 case distinctions, treesize of input 524 treesize of output 516 [2022-12-14 08:50:43,612 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:50:43,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 507 treesize of output 469 [2022-12-14 08:50:43,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 416 treesize of output 395 [2022-12-14 08:50:43,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:43,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:43,888 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:44,358 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11438#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:44,359 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:44,359 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:44,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2022-12-14 08:50:44,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866459599] [2022-12-14 08:50:44,359 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:44,359 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-12-14 08:50:44,359 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:44,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-12-14 08:50:44,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=724, Invalid=2936, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 08:50:44,360 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:44,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:44,645 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2022-12-14 08:50:44,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 08:50:44,645 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2022-12-14 08:50:44,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:44,645 INFO L225 Difference]: With dead ends: 132 [2022-12-14 08:50:44,645 INFO L226 Difference]: Without dead ends: 78 [2022-12-14 08:50:44,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 152 SyntacticMatches, 33 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2453 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1196, Invalid=4656, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 08:50:44,646 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 154 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:44,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [154 Valid, 185 Invalid, 444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:50:44,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-12-14 08:50:44,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2022-12-14 08:50:44,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:44,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-12-14 08:50:44,662 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 70 [2022-12-14 08:50:44,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:44,662 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-12-14 08:50:44,662 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:44,662 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-12-14 08:50:44,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-12-14 08:50:44,662 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:44,662 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1] [2022-12-14 08:50:44,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-12-14 08:50:44,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 08:50:44,864 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:44,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:44,864 INFO L85 PathProgramCache]: Analyzing trace with hash -429927197, now seen corresponding path program 26 times [2022-12-14 08:50:44,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:44,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394381886] [2022-12-14 08:50:44,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:44,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:44,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:45,905 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:45,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:45,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394381886] [2022-12-14 08:50:45,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394381886] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:45,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406958394] [2022-12-14 08:50:45,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:50:45,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:45,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:45,906 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:45,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 08:50:54,283 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-12-14 08:50:54,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:50:54,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 49 conjunts are in the unsatisfiable core [2022-12-14 08:50:54,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:54,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 46 [2022-12-14 08:50:54,823 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2022-12-14 08:50:56,318 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-12-14 08:50:56,318 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 23 [2022-12-14 08:50:56,358 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 376 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:56,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:58,470 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:58,470 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:50:58,477 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:58,478 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:50:58,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 26 [2022-12-14 08:50:58,493 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:50:58,494 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2022-12-14 08:50:58,905 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 360 proven. 185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:58,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406958394] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:58,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [174153896] [2022-12-14 08:50:58,906 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:50:58,906 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:58,906 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:58,906 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:58,906 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:58,948 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:50:58,948 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 [2022-12-14 08:50:58,980 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:50:58,980 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 [2022-12-14 08:50:58,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:50:59,018 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:50:59,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,143 INFO L321 Elim1Store]: treesize reduction 261, result has 7.8 percent of original size [2022-12-14 08:50:59,144 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 41 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 16 case distinctions, treesize of input 686 treesize of output 706 [2022-12-14 08:50:59,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:50:59,192 INFO L321 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2022-12-14 08:50:59,193 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 2 case distinctions, treesize of input 509 treesize of output 503 [2022-12-14 08:50:59,391 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:50:59,391 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 507 treesize of output 457 [2022-12-14 08:50:59,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 419 treesize of output 387 [2022-12-14 08:50:59,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 386 treesize of output 380 [2022-12-14 08:50:59,443 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:50:59,522 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:59,527 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:50:59,594 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:00,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12281#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:00,438 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:00,438 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:00,438 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 92 [2022-12-14 08:51:00,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756854245] [2022-12-14 08:51:00,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:00,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-12-14 08:51:00,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:00,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-12-14 08:51:00,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=958, Invalid=8547, Unknown=1, NotChecked=0, Total=9506 [2022-12-14 08:51:00,441 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 92 states, 92 states have (on average 2.0760869565217392) internal successors, (191), 92 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:10,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:51:10,198 INFO L93 Difference]: Finished difference Result 194 states and 201 transitions. [2022-12-14 08:51:10,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2022-12-14 08:51:10,198 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 2.0760869565217392) internal successors, (191), 92 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2022-12-14 08:51:10,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:51:10,199 INFO L225 Difference]: With dead ends: 194 [2022-12-14 08:51:10,199 INFO L226 Difference]: Without dead ends: 83 [2022-12-14 08:51:10,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 136 SyntacticMatches, 17 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12001 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=4575, Invalid=45823, Unknown=2, NotChecked=0, Total=50400 [2022-12-14 08:51:10,203 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 578 mSDsluCounter, 659 mSDsCounter, 0 mSdLazyCounter, 2166 mSolverCounterSat, 229 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 578 SdHoareTripleChecker+Valid, 677 SdHoareTripleChecker+Invalid, 2396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 229 IncrementalHoareTripleChecker+Valid, 2166 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:51:10,203 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [578 Valid, 677 Invalid, 2396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [229 Valid, 2166 Invalid, 1 Unknown, 0 Unchecked, 1.7s Time] [2022-12-14 08:51:10,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-12-14 08:51:10,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 77. [2022-12-14 08:51:10,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 76 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:10,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2022-12-14 08:51:10,221 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 71 [2022-12-14 08:51:10,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:51:10,221 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2022-12-14 08:51:10,221 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 2.0760869565217392) internal successors, (191), 92 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:10,221 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2022-12-14 08:51:10,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-12-14 08:51:10,222 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:51:10,222 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 17, 17, 1, 1, 1, 1, 1] [2022-12-14 08:51:10,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-12-14 08:51:10,423 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 08:51:10,424 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:51:10,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:51:10,425 INFO L85 PathProgramCache]: Analyzing trace with hash -225583555, now seen corresponding path program 27 times [2022-12-14 08:51:10,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:51:10,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319985474] [2022-12-14 08:51:10,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:51:10,425 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:51:10,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:11,499 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:11,500 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:11,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319985474] [2022-12-14 08:51:11,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319985474] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:11,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455107745] [2022-12-14 08:51:11,500 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:51:11,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:11,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:11,501 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:11,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 08:51:11,669 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:51:11,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:51:11,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 95 conjunts are in the unsatisfiable core [2022-12-14 08:51:11,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:51:12,151 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:51:12,153 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:51:12,204 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-12-14 08:51:13,090 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:13,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:51:13,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:51:13,349 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:51:13,350 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:51:13,354 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:51:13,354 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:51:13,367 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:51:13,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 45 [2022-12-14 08:51:13,406 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:13,406 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455107745] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:51:13,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [940583527] [2022-12-14 08:51:13,407 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:51:13,407 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:51:13,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:51:13,407 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:51:13,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:51:13,446 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:51:13,446 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 [2022-12-14 08:51:13,454 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:51:13,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:51:13,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:13,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:13,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:13,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:13,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:13,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:13,538 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:51:13,585 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:51:13,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:51:13,881 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:51:13,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 762 [2022-12-14 08:51:13,889 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 743 treesize of output 707 [2022-12-14 08:51:13,902 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 722 treesize of output 704 [2022-12-14 08:51:13,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:13,912 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 723 treesize of output 714 [2022-12-14 08:51:14,110 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:51:14,115 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 16 treesize of output 12 [2022-12-14 08:51:14,177 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:14,798 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13460#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:14,798 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:14,798 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:14,798 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 84 [2022-12-14 08:51:14,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320110524] [2022-12-14 08:51:14,798 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:14,798 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-12-14 08:51:14,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:14,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-12-14 08:51:14,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=7655, Unknown=0, NotChecked=0, Total=8010 [2022-12-14 08:51:14,799 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand has 84 states, 84 states have (on average 1.880952380952381) internal successors, (158), 84 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:16,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:51:16,694 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2022-12-14 08:51:16,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-12-14 08:51:16,694 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.880952380952381) internal successors, (158), 84 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2022-12-14 08:51:16,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:51:16,695 INFO L225 Difference]: With dead ends: 94 [2022-12-14 08:51:16,695 INFO L226 Difference]: Without dead ends: 92 [2022-12-14 08:51:16,696 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 177 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2929 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=744, Invalid=13298, Unknown=0, NotChecked=0, Total=14042 [2022-12-14 08:51:16,696 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 65 mSDsluCounter, 965 mSDsCounter, 0 mSdLazyCounter, 3339 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 984 SdHoareTripleChecker+Invalid, 3369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 3339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:51:16,696 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 984 Invalid, 3369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 3339 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 08:51:16,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-12-14 08:51:16,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 80. [2022-12-14 08:51:16,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:16,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-12-14 08:51:16,718 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 76 [2022-12-14 08:51:16,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:51:16,718 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-12-14 08:51:16,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.880952380952381) internal successors, (158), 84 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:16,718 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-12-14 08:51:16,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-12-14 08:51:16,718 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:51:16,718 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1] [2022-12-14 08:51:16,724 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-12-14 08:51:16,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 08:51:16,920 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:51:16,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:51:16,920 INFO L85 PathProgramCache]: Analyzing trace with hash 1269266307, now seen corresponding path program 28 times [2022-12-14 08:51:16,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:51:16,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522160628] [2022-12-14 08:51:16,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:51:16,921 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:51:17,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:18,000 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:18,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:18,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522160628] [2022-12-14 08:51:18,000 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522160628] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:18,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814177077] [2022-12-14 08:51:18,000 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:51:18,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:18,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:18,001 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:18,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 08:51:18,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:18,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 95 conjunts are in the unsatisfiable core [2022-12-14 08:51:18,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:51:18,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:51:20,197 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:20,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:51:20,338 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:51:20,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:51:20,345 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:51:20,345 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:51:20,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:51:20,365 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:51:20,365 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:51:20,424 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:20,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814177077] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:51:20,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [536559148] [2022-12-14 08:51:20,425 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:51:20,425 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:51:20,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:51:20,426 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:51:20,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:51:20,475 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:51:20,476 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 [2022-12-14 08:51:20,486 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:51:20,507 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:51:20,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:20,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:20,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:20,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:20,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:20,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:20,565 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:51:20,628 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:51:20,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:51:20,816 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:51:20,817 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 762 [2022-12-14 08:51:20,844 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:51:20,844 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 737 treesize of output 736 [2022-12-14 08:51:21,227 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:51:21,233 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:51:21,300 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:22,063 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14330#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:22,063 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:22,063 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:22,064 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 83 [2022-12-14 08:51:22,064 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404565678] [2022-12-14 08:51:22,064 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:22,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-12-14 08:51:22,064 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:22,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-12-14 08:51:22,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=7528, Unknown=0, NotChecked=0, Total=7832 [2022-12-14 08:51:22,066 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 83 states, 83 states have (on average 1.927710843373494) internal successors, (160), 83 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:23,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:51:23,752 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2022-12-14 08:51:23,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-12-14 08:51:23,752 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.927710843373494) internal successors, (160), 83 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2022-12-14 08:51:23,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:51:23,753 INFO L225 Difference]: With dead ends: 87 [2022-12-14 08:51:23,753 INFO L226 Difference]: Without dead ends: 85 [2022-12-14 08:51:23,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 188 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2252 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=520, Invalid=11690, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 08:51:23,754 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 43 mSDsluCounter, 992 mSDsCounter, 0 mSdLazyCounter, 3306 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 1012 SdHoareTripleChecker+Invalid, 3327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 3306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:51:23,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 1012 Invalid, 3327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 3306 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 08:51:23,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-12-14 08:51:23,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2022-12-14 08:51:23,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:23,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2022-12-14 08:51:23,788 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 79 [2022-12-14 08:51:23,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:51:23,788 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2022-12-14 08:51:23,788 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.927710843373494) internal successors, (160), 83 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:23,788 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2022-12-14 08:51:23,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 08:51:23,789 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:51:23,789 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1, 1] [2022-12-14 08:51:23,794 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-12-14 08:51:23,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:23,990 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:51:23,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:51:23,991 INFO L85 PathProgramCache]: Analyzing trace with hash -174387075, now seen corresponding path program 29 times [2022-12-14 08:51:23,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:51:23,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725144075] [2022-12-14 08:51:23,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:51:23,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:51:24,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:24,711 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 496 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:24,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:24,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725144075] [2022-12-14 08:51:24,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [725144075] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:24,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412165228] [2022-12-14 08:51:24,712 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:51:24,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:24,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:24,713 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:24,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 08:51:40,781 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-12-14 08:51:40,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:51:40,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 08:51:40,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:51:41,375 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:41,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:51:41,806 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:41,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412165228] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:51:41,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [247701613] [2022-12-14 08:51:41,807 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:51:41,807 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:51:41,807 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:51:41,807 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:51:41,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:51:41,853 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:51:41,853 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 [2022-12-14 08:51:41,893 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:51:41,893 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 [2022-12-14 08:51:41,918 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:51:41,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:41,965 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 139 treesize of output 111 [2022-12-14 08:51:41,969 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-12-14 08:51:41,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:51:41,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:51:42,035 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:43,238 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15181#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:43,238 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:43,238 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:43,239 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 64 [2022-12-14 08:51:43,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672889139] [2022-12-14 08:51:43,239 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:43,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-12-14 08:51:43,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:43,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-12-14 08:51:43,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=963, Invalid=3729, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 08:51:43,240 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:43,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:51:43,640 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2022-12-14 08:51:43,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-12-14 08:51:43,640 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2022-12-14 08:51:43,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:51:43,640 INFO L225 Difference]: With dead ends: 153 [2022-12-14 08:51:43,640 INFO L226 Difference]: Without dead ends: 90 [2022-12-14 08:51:43,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 160 SyntacticMatches, 59 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4455 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1609, Invalid=6047, Unknown=0, NotChecked=0, Total=7656 [2022-12-14 08:51:43,641 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 208 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:51:43,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 195 Invalid, 495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:51:43,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-12-14 08:51:43,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2022-12-14 08:51:43,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:43,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2022-12-14 08:51:43,666 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 82 [2022-12-14 08:51:43,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:51:43,666 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2022-12-14 08:51:43,666 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:43,666 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2022-12-14 08:51:43,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-12-14 08:51:43,666 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:51:43,666 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1] [2022-12-14 08:51:43,676 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-12-14 08:51:43,867 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-12-14 08:51:43,868 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:51:43,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:51:43,869 INFO L85 PathProgramCache]: Analyzing trace with hash 159681718, now seen corresponding path program 30 times [2022-12-14 08:51:43,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:51:43,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878602274] [2022-12-14 08:51:43,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:51:43,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:51:43,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:45,180 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:45,180 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:45,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878602274] [2022-12-14 08:51:45,180 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878602274] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:45,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231915908] [2022-12-14 08:51:45,180 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:51:45,180 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:45,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:45,181 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:45,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 08:51:45,316 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:51:45,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:51:45,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 99 conjunts are in the unsatisfiable core [2022-12-14 08:51:45,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:51:46,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:51:47,669 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:47,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:51:47,882 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:51:47,882 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:51:47,889 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:51:47,890 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:51:47,903 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:51:47,911 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:51:47,912 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:51:47,977 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:47,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231915908] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:51:47,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1518248013] [2022-12-14 08:51:47,979 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:51:47,979 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:51:47,979 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:51:47,979 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:51:47,979 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:51:48,028 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:51:48,028 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 [2022-12-14 08:51:48,038 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:51:48,064 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:51:48,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:48,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:48,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:48,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:48,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:48,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:48,119 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:51:48,181 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:51:48,181 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:51:48,344 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:51:48,344 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 770 [2022-12-14 08:51:48,366 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:51:48,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 737 treesize of output 736 [2022-12-14 08:51:48,710 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:51:48,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:51:48,775 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:49,646 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16146#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:49,646 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:49,646 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:49,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 45] total 89 [2022-12-14 08:51:49,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904722823] [2022-12-14 08:51:49,647 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:49,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-12-14 08:51:49,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:49,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-12-14 08:51:49,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=8598, Unknown=0, NotChecked=0, Total=8930 [2022-12-14 08:51:49,649 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 89 states, 89 states have (on average 1.9101123595505618) internal successors, (170), 89 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:51,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:51:51,688 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2022-12-14 08:51:51,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-12-14 08:51:51,689 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.9101123595505618) internal successors, (170), 89 states have internal predecessors, (170), 0 states have call successors, (0), 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 83 [2022-12-14 08:51:51,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:51:51,689 INFO L225 Difference]: With dead ends: 91 [2022-12-14 08:51:51,689 INFO L226 Difference]: Without dead ends: 89 [2022-12-14 08:51:51,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 196 SyntacticMatches, 2 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2815 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=596, Invalid=13924, Unknown=0, NotChecked=0, Total=14520 [2022-12-14 08:51:51,690 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 39 mSDsluCounter, 1034 mSDsCounter, 0 mSdLazyCounter, 3741 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 1054 SdHoareTripleChecker+Invalid, 3763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 3741 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:51:51,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 1054 Invalid, 3763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 3741 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 08:51:51,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-12-14 08:51:51,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2022-12-14 08:51:51,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:51,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2022-12-14 08:51:51,712 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 83 [2022-12-14 08:51:51,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:51:51,712 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2022-12-14 08:51:51,712 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.9101123595505618) internal successors, (170), 89 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:51,712 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2022-12-14 08:51:51,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-12-14 08:51:51,713 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:51:51,713 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1, 1] [2022-12-14 08:51:51,718 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-12-14 08:51:51,913 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-12-14 08:51:51,914 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:51:51,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:51:51,915 INFO L85 PathProgramCache]: Analyzing trace with hash -1740567958, now seen corresponding path program 31 times [2022-12-14 08:51:51,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:51:51,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084685761] [2022-12-14 08:51:51,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:51:51,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:51:51,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:52,619 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 552 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:52,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:52,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084685761] [2022-12-14 08:51:52,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084685761] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:52,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697992557] [2022-12-14 08:51:52,619 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:51:52,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:52,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:52,620 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:52,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 08:51:52,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:52,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 44 conjunts are in the unsatisfiable core [2022-12-14 08:51:52,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:51:53,482 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:53,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:51:53,966 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:53,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697992557] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:51:53,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [412958574] [2022-12-14 08:51:53,967 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:51:53,967 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:51:53,967 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:51:53,967 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:51:53,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:51:54,009 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:51:54,010 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 [2022-12-14 08:51:54,018 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:51:54,036 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:51:54,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:51:54,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 150 treesize of output 120 [2022-12-14 08:51:54,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-12-14 08:51:54,107 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:51:54,112 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:51:54,159 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:55,487 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17044#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:55,487 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:55,487 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:55,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2022-12-14 08:51:55,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246822115] [2022-12-14 08:51:55,488 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:55,488 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-12-14 08:51:55,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:55,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-12-14 08:51:55,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1052, Invalid=4060, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 08:51:55,489 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:55,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:51:55,896 INFO L93 Difference]: Finished difference Result 160 states and 162 transitions. [2022-12-14 08:51:55,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-12-14 08:51:55,897 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2022-12-14 08:51:55,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:51:55,897 INFO L225 Difference]: With dead ends: 160 [2022-12-14 08:51:55,897 INFO L226 Difference]: Without dead ends: 94 [2022-12-14 08:51:55,898 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 168 SyntacticMatches, 62 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4878 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1762, Invalid=6610, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 08:51:55,898 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 214 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:51:55,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [214 Valid, 157 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:51:55,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-12-14 08:51:55,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-12-14 08:51:55,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:55,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-12-14 08:51:55,925 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 86 [2022-12-14 08:51:55,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:51:55,925 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-12-14 08:51:55,925 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:55,925 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-12-14 08:51:55,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-12-14 08:51:55,925 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:51:55,925 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1] [2022-12-14 08:51:55,930 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 08:51:56,126 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:56,127 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:51:56,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:51:56,127 INFO L85 PathProgramCache]: Analyzing trace with hash 1714405923, now seen corresponding path program 32 times [2022-12-14 08:51:56,128 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:51:56,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411645479] [2022-12-14 08:51:56,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:51:56,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:51:56,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:57,562 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:57,562 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:57,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411645479] [2022-12-14 08:51:57,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411645479] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:57,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231111760] [2022-12-14 08:51:57,563 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:51:57,563 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:57,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:57,564 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:57,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 08:52:41,157 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2022-12-14 08:52:41,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:52:41,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 57 conjunts are in the unsatisfiable core [2022-12-14 08:52:41,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:52:41,841 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 46 [2022-12-14 08:52:41,843 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2022-12-14 08:52:41,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2022-12-14 08:52:43,690 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-12-14 08:52:43,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 23 [2022-12-14 08:52:43,737 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 590 proven. 251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:43,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:52:46,349 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:52:46,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:52:46,357 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:52:46,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:52:46,367 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 45 [2022-12-14 08:52:46,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 26 [2022-12-14 08:52:46,374 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:52:46,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2022-12-14 08:52:47,164 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 570 proven. 271 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:47,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231111760] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:52:47,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [627519557] [2022-12-14 08:52:47,165 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:52:47,165 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:52:47,165 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:52:47,165 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:52:47,165 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:52:47,210 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:52:47,210 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 [2022-12-14 08:52:47,252 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:52:47,252 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 [2022-12-14 08:52:47,267 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:52:47,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:52:47,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:52:47,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:52:47,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:52:47,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:52:47,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:52:47,323 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:52:47,384 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:52:47,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:52:47,539 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:52:47,539 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 490 treesize of output 438 [2022-12-14 08:52:47,544 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2022-12-14 08:52:47,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:52:47,552 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 375 treesize of output 364 [2022-12-14 08:52:47,559 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 415 treesize of output 379 [2022-12-14 08:52:47,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:52:47,665 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:52:47,718 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:52:48,560 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18074#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:52:48,561 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:52:48,561 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:52:48,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 112 [2022-12-14 08:52:48,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104965196] [2022-12-14 08:52:48,561 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:52:48,561 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2022-12-14 08:52:48,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:52:48,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2022-12-14 08:52:48,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1384, Invalid=12421, Unknown=1, NotChecked=0, Total=13806 [2022-12-14 08:52:48,563 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 112 states, 112 states have (on average 2.0982142857142856) internal successors, (235), 112 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:05,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:53:05,041 INFO L93 Difference]: Finished difference Result 234 states and 241 transitions. [2022-12-14 08:53:05,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 160 states. [2022-12-14 08:53:05,041 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 2.0982142857142856) internal successors, (235), 112 states have internal predecessors, (235), 0 states have call successors, (0), 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 87 [2022-12-14 08:53:05,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:53:05,042 INFO L225 Difference]: With dead ends: 234 [2022-12-14 08:53:05,042 INFO L226 Difference]: Without dead ends: 99 [2022-12-14 08:53:05,045 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 168 SyntacticMatches, 21 SemanticMatches, 271 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17749 ImplicationChecksByTransitivity, 20.8s TimeCoverageRelationStatistics Valid=6375, Invalid=67872, Unknown=9, NotChecked=0, Total=74256 [2022-12-14 08:53:05,045 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 820 mSDsluCounter, 959 mSDsCounter, 0 mSdLazyCounter, 3165 mSolverCounterSat, 343 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 820 SdHoareTripleChecker+Valid, 981 SdHoareTripleChecker+Invalid, 3509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 343 IncrementalHoareTripleChecker+Valid, 3165 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:53:05,045 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [820 Valid, 981 Invalid, 3509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [343 Valid, 3165 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2022-12-14 08:53:05,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-12-14 08:53:05,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 93. [2022-12-14 08:53:05,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0217391304347827) internal successors, (94), 92 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:05,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2022-12-14 08:53:05,072 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 87 [2022-12-14 08:53:05,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:53:05,073 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2022-12-14 08:53:05,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 2.0982142857142856) internal successors, (235), 112 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:05,073 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2022-12-14 08:53:05,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-12-14 08:53:05,073 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:53:05,073 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 21, 21, 1, 1, 1, 1, 1] [2022-12-14 08:53:05,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-12-14 08:53:05,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-12-14 08:53:05,275 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:53:05,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:53:05,275 INFO L85 PathProgramCache]: Analyzing trace with hash 222669053, now seen corresponding path program 33 times [2022-12-14 08:53:05,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:53:05,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32672168] [2022-12-14 08:53:05,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:53:05,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:53:05,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:53:06,828 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:06,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:53:06,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32672168] [2022-12-14 08:53:06,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [32672168] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:53:06,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036984055] [2022-12-14 08:53:06,828 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:53:06,828 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:06,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:53:06,829 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:53:06,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 08:53:07,001 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:53:07,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:53:07,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 111 conjunts are in the unsatisfiable core [2022-12-14 08:53:07,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:53:07,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:53:07,950 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-12-14 08:53:09,516 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:09,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:53:09,753 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:53:09,893 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:53:09,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:53:09,899 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:53:09,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:53:09,912 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 41 [2022-12-14 08:53:09,918 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:53:09,918 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 45 [2022-12-14 08:53:09,988 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:09,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036984055] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:53:09,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1382768205] [2022-12-14 08:53:09,990 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:53:09,990 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:53:09,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:53:09,990 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:53:09,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:53:10,037 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:53:10,037 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 [2022-12-14 08:53:10,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:53:10,066 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:53:10,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:53:10,113 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 119 [2022-12-14 08:53:10,122 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-12-14 08:53:10,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:53:10,160 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:53:10,226 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:53:13,276 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19501#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:53:13,277 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:53:13,277 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:53:13,277 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 50, 50] total 100 [2022-12-14 08:53:13,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115027647] [2022-12-14 08:53:13,277 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:53:13,278 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-12-14 08:53:13,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:53:13,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-12-14 08:53:13,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=10505, Unknown=0, NotChecked=0, Total=10920 [2022-12-14 08:53:13,279 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand has 100 states, 100 states have (on average 1.9) internal successors, (190), 100 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:15,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:53:15,952 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2022-12-14 08:53:15,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-12-14 08:53:15,952 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.9) internal successors, (190), 100 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2022-12-14 08:53:15,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:53:15,953 INFO L225 Difference]: With dead ends: 110 [2022-12-14 08:53:15,953 INFO L226 Difference]: Without dead ends: 108 [2022-12-14 08:53:15,954 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 196 SyntacticMatches, 24 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5128 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=864, Invalid=18042, Unknown=0, NotChecked=0, Total=18906 [2022-12-14 08:53:15,954 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 71 mSDsluCounter, 1331 mSDsCounter, 0 mSdLazyCounter, 4504 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 1354 SdHoareTripleChecker+Invalid, 4539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 4504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:53:15,954 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 1354 Invalid, 4539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 4504 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-12-14 08:53:15,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-12-14 08:53:15,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 96. [2022-12-14 08:53:15,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:15,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2022-12-14 08:53:15,995 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 92 [2022-12-14 08:53:15,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:53:15,995 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2022-12-14 08:53:15,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 1.9) internal successors, (190), 100 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:15,996 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2022-12-14 08:53:15,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-12-14 08:53:15,996 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:53:15,996 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1, 1] [2022-12-14 08:53:16,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-12-14 08:53:16,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-12-14 08:53:16,197 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:53:16,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:53:16,198 INFO L85 PathProgramCache]: Analyzing trace with hash 2109387971, now seen corresponding path program 34 times [2022-12-14 08:53:16,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:53:16,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999572301] [2022-12-14 08:53:16,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:53:16,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:53:16,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:53:17,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:17,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:53:17,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999572301] [2022-12-14 08:53:17,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999572301] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:53:17,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [992806382] [2022-12-14 08:53:17,665 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:53:17,665 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:17,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:53:17,666 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:53:17,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 08:53:17,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:53:17,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 106 conjunts are in the unsatisfiable core [2022-12-14 08:53:17,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:53:18,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:53:20,068 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:20,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:53:20,189 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:53:20,189 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:53:20,194 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:53:20,194 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:53:20,203 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 30 [2022-12-14 08:53:20,207 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:53:20,211 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:53:20,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:53:20,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:20,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [992806382] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:53:20,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1717309064] [2022-12-14 08:53:20,266 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:53:20,266 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:53:20,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:53:20,266 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:53:20,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:53:20,304 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:53:20,304 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 [2022-12-14 08:53:20,335 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:53:20,335 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 [2022-12-14 08:53:20,356 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:53:20,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:53:20,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:53:20,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:53:20,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:53:20,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:53:20,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:53:20,409 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:53:20,454 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:53:20,454 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:53:20,563 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:53:20,564 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 780 [2022-12-14 08:53:20,582 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:53:20,583 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 739 treesize of output 740 [2022-12-14 08:53:21,105 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:53:21,109 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:53:21,164 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:53:21,828 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20538#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:53:21,828 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:53:21,828 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:53:21,829 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2022-12-14 08:53:21,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463206774] [2022-12-14 08:53:21,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:53:21,829 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-12-14 08:53:21,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:53:21,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-12-14 08:53:21,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=10560, Unknown=0, NotChecked=0, Total=10920 [2022-12-14 08:53:21,830 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 99 states, 99 states have (on average 1.9393939393939394) internal successors, (192), 99 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:23,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:53:23,908 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2022-12-14 08:53:23,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-12-14 08:53:23,908 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.9393939393939394) internal successors, (192), 99 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2022-12-14 08:53:23,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:53:23,909 INFO L225 Difference]: With dead ends: 103 [2022-12-14 08:53:23,909 INFO L226 Difference]: Without dead ends: 101 [2022-12-14 08:53:23,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 228 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3130 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=616, Invalid=16414, Unknown=0, NotChecked=0, Total=17030 [2022-12-14 08:53:23,910 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 47 mSDsluCounter, 1362 mSDsCounter, 0 mSdLazyCounter, 4323 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 1386 SdHoareTripleChecker+Invalid, 4348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 4323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:53:23,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 1386 Invalid, 4348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 4323 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 08:53:23,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-12-14 08:53:23,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2022-12-14 08:53:23,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:23,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2022-12-14 08:53:23,939 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 95 [2022-12-14 08:53:23,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:53:23,939 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2022-12-14 08:53:23,939 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 1.9393939393939394) internal successors, (192), 99 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:23,940 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2022-12-14 08:53:23,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-12-14 08:53:23,940 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:53:23,940 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 23, 1, 1, 1, 1, 1] [2022-12-14 08:53:23,945 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 08:53:24,140 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:24,141 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:53:24,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:53:24,142 INFO L85 PathProgramCache]: Analyzing trace with hash 1115671357, now seen corresponding path program 35 times [2022-12-14 08:53:24,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:53:24,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784906577] [2022-12-14 08:53:24,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:53:24,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:53:24,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:53:25,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 738 proven. 343 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:25,098 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:53:25,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784906577] [2022-12-14 08:53:25,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784906577] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:53:25,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692775515] [2022-12-14 08:53:25,099 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:53:25,099 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:25,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:53:25,100 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:53:25,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 08:55:28,250 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-12-14 08:55:28,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:28,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 536 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 08:55:28,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:29,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:29,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:29,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:29,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [692775515] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:29,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1241714874] [2022-12-14 08:55:29,487 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:55:29,487 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:29,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:29,488 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:29,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:29,522 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:55:29,523 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 [2022-12-14 08:55:29,530 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:55:29,546 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:55:29,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:29,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:29,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:29,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:29,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:29,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:29,602 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:55:29,652 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:55:29,652 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:55:29,868 INFO L321 Elim1Store]: treesize reduction 48, result has 18.6 percent of original size [2022-12-14 08:55:29,868 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 490 treesize of output 448 [2022-12-14 08:55:29,887 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:55:29,888 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 399 treesize of output 398 [2022-12-14 08:55:29,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:55:29,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:55:30,051 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:30,431 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21553#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:30,432 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:30,432 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:30,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 76 [2022-12-14 08:55:30,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902787933] [2022-12-14 08:55:30,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:30,432 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-12-14 08:55:30,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:30,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-12-14 08:55:30,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1347, Invalid=5295, Unknown=0, NotChecked=0, Total=6642 [2022-12-14 08:55:30,434 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:30,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:30,899 INFO L93 Difference]: Finished difference Result 181 states and 183 transitions. [2022-12-14 08:55:30,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-12-14 08:55:30,899 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2022-12-14 08:55:30,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:30,900 INFO L225 Difference]: With dead ends: 181 [2022-12-14 08:55:30,900 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 08:55:30,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 215 SyntacticMatches, 47 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4560 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2267, Invalid=8653, Unknown=0, NotChecked=0, Total=10920 [2022-12-14 08:55:30,901 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 222 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 555 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 666 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 555 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:30,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 275 Invalid, 666 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 555 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:55:30,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 08:55:30,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 100. [2022-12-14 08:55:30,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.02020202020202) internal successors, (101), 99 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:30,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2022-12-14 08:55:30,930 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 98 [2022-12-14 08:55:30,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:30,931 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2022-12-14 08:55:30,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:30,931 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2022-12-14 08:55:30,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-12-14 08:55:30,931 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:30,931 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1, 1] [2022-12-14 08:55:30,948 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 08:55:31,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 08:55:31,133 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:31,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:31,134 INFO L85 PathProgramCache]: Analyzing trace with hash -1581009546, now seen corresponding path program 36 times [2022-12-14 08:55:31,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:31,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472257740] [2022-12-14 08:55:31,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:31,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:31,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:32,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:32,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:32,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472257740] [2022-12-14 08:55:32,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472257740] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:32,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018673246] [2022-12-14 08:55:32,811 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:55:32,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:32,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:32,812 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:32,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 08:55:33,024 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:55:33,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:33,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 115 conjunts are in the unsatisfiable core [2022-12-14 08:55:33,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:33,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 08:55:35,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:35,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:35,445 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:55:35,445 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2022-12-14 08:55:35,454 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 08:55:35,454 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2022-12-14 08:55:35,462 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 30 [2022-12-14 08:55:35,464 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 08:55:35,470 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-12-14 08:55:35,470 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2022-12-14 08:55:35,521 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:35,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018673246] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:35,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1328430912] [2022-12-14 08:55:35,522 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:55:35,522 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:35,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:35,522 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:35,522 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:35,563 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 08:55:35,563 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 [2022-12-14 08:55:35,593 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:55:35,593 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 [2022-12-14 08:55:35,611 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 108 [2022-12-14 08:55:35,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:35,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:35,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:35,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:35,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:35,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:35,662 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 08:55:35,707 INFO L321 Elim1Store]: treesize reduction 257, result has 15.7 percent of original size [2022-12-14 08:55:35,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 34 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 18 case distinctions, treesize of input 407 treesize of output 474 [2022-12-14 08:55:35,765 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:55:35,765 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 490 treesize of output 442 [2022-12-14 08:55:35,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 423 treesize of output 395 [2022-12-14 08:55:35,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 386 treesize of output 380 [2022-12-14 08:55:35,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:35,804 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 383 treesize of output 372 [2022-12-14 08:55:35,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:55:36,003 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 [2022-12-14 08:55:36,068 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:36,847 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22703#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:36,847 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:36,847 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:36,847 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 53, 53] total 105 [2022-12-14 08:55:36,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938507040] [2022-12-14 08:55:36,847 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:36,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2022-12-14 08:55:36,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:36,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2022-12-14 08:55:36,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=11820, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 08:55:36,849 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand has 105 states, 105 states have (on average 1.9047619047619047) internal successors, (200), 105 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:39,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:39,204 INFO L93 Difference]: Finished difference Result 107 states and 108 transitions. [2022-12-14 08:55:39,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-12-14 08:55:39,204 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.9047619047619047) internal successors, (200), 105 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2022-12-14 08:55:39,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:39,205 INFO L225 Difference]: With dead ends: 107 [2022-12-14 08:55:39,205 INFO L226 Difference]: Without dead ends: 105 [2022-12-14 08:55:39,206 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3709 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=681, Invalid=18779, Unknown=0, NotChecked=0, Total=19460 [2022-12-14 08:55:39,206 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 41 mSDsluCounter, 1409 mSDsCounter, 0 mSdLazyCounter, 4930 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 1433 SdHoareTripleChecker+Invalid, 4956 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 4930 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:39,206 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 1433 Invalid, 4956 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 4930 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 08:55:39,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-12-14 08:55:39,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 103. [2022-12-14 08:55:39,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0196078431372548) internal successors, (104), 102 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:39,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2022-12-14 08:55:39,237 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 99 [2022-12-14 08:55:39,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:39,237 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2022-12-14 08:55:39,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.9047619047619047) internal successors, (200), 105 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:39,237 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2022-12-14 08:55:39,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-12-14 08:55:39,238 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:39,238 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 24, 1, 1, 1, 1, 1] [2022-12-14 08:55:39,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-12-14 08:55:39,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-12-14 08:55:39,439 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:39,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:39,440 INFO L85 PathProgramCache]: Analyzing trace with hash -1238881878, now seen corresponding path program 37 times [2022-12-14 08:55:39,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:39,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317896237] [2022-12-14 08:55:39,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:39,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:39,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:40,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 806 proven. 370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:40,376 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:40,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317896237] [2022-12-14 08:55:40,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [317896237] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:40,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455946358] [2022-12-14 08:55:40,377 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:55:40,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:40,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:40,377 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:40,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 08:55:40,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:40,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 52 conjunts are in the unsatisfiable core [2022-12-14 08:55:40,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:41,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:41,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:41,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:41,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [455946358] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:41,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1387886194] [2022-12-14 08:55:41,888 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 08:55:41,888 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:41,888 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:41,888 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:41,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:41,927 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 08:55:41,927 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 [2022-12-14 08:55:41,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 08:55:41,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 227 [2022-12-14 08:55:41,968 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 08:55:42,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,080 INFO L321 Elim1Store]: treesize reduction 261, result has 7.8 percent of original size [2022-12-14 08:55:42,080 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 41 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 16 case distinctions, treesize of input 690 treesize of output 710 [2022-12-14 08:55:42,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 08:55:42,126 INFO L321 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2022-12-14 08:55:42,126 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 19 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 2 case distinctions, treesize of input 531 treesize of output 523 [2022-12-14 08:55:42,331 INFO L321 Elim1Store]: treesize reduction 58, result has 1.7 percent of original size [2022-12-14 08:55:42,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 507 treesize of output 459 [2022-12-14 08:55:42,339 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 396 treesize of output 375 [2022-12-14 08:55:42,350 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 423 treesize of output 395 [2022-12-14 08:55:42,360 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 386 treesize of output 380 [2022-12-14 08:55:42,485 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:55:42,490 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 08:55:42,550 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:43,011 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23763#(and (<= 0 ~SIZE~0) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:43,011 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:43,011 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:43,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2022-12-14 08:55:43,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436076643] [2022-12-14 08:55:43,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:43,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-12-14 08:55:43,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:43,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-12-14 08:55:43,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1452, Invalid=5688, Unknown=0, NotChecked=0, Total=7140 [2022-12-14 08:55:43,013 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 79 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 79 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:43,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:43,574 INFO L93 Difference]: Finished difference Result 188 states and 190 transitions. [2022-12-14 08:55:43,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-12-14 08:55:43,574 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 79 states have internal predecessors, (182), 0 states have call successors, (0), 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 102 [2022-12-14 08:55:43,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:43,575 INFO L225 Difference]: With dead ends: 188 [2022-12-14 08:55:43,575 INFO L226 Difference]: Without dead ends: 110 [2022-12-14 08:55:43,576 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 224 SyntacticMatches, 49 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4913 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2448, Invalid=9324, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 08:55:43,576 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 314 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 713 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:43,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 271 Invalid, 713 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 556 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:55:43,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-12-14 08:55:43,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 104. [2022-12-14 08:55:43,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.0194174757281553) internal successors, (105), 103 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:43,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2022-12-14 08:55:43,608 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 102 [2022-12-14 08:55:43,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:43,608 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2022-12-14 08:55:43,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 79 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:43,608 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2022-12-14 08:55:43,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-12-14 08:55:43,608 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:43,608 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1, 1] [2022-12-14 08:55:43,613 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-12-14 08:55:43,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-12-14 08:55:43,809 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:43,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:43,810 INFO L85 PathProgramCache]: Analyzing trace with hash -1601548445, now seen corresponding path program 38 times [2022-12-14 08:55:43,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:43,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450811596] [2022-12-14 08:55:43,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:43,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:43,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:45,402 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:45,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:45,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450811596] [2022-12-14 08:55:45,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450811596] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:45,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209397435] [2022-12-14 08:55:45,403 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:55:45,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:45,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:45,404 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:45,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_245c772c-f0b8-4723-bd15-1850ef53ceb0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 09:00:09,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2022-12-14 09:00:09,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:00:09,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 96 conjunts are in the unsatisfiable core [2022-12-14 09:00:09,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:00:09,974 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 46 [2022-12-14 09:00:09,977 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2022-12-14 09:00:09,983 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 8 treesize of output 1 [2022-12-14 09:00:10,607 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 55 [2022-12-14 09:00:10,619 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-12-14 09:00:10,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 26 [2022-12-14 09:00:11,438 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 69 [2022-12-14 09:00:11,467 INFO L321 Elim1Store]: treesize reduction 56, result has 43.4 percent of original size [2022-12-14 09:00:11,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 61 [2022-12-14 09:00:11,473 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 8 treesize of output 1 [2022-12-14 09:00:11,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 87 [2022-12-14 09:00:11,750 INFO L321 Elim1Store]: treesize reduction 44, result has 55.6 percent of original size [2022-12-14 09:00:11,751 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 50 treesize of output 91 [2022-12-14 09:00:11,825 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 8 treesize of output 1 [2022-12-14 09:00:11,885 INFO L321 Elim1Store]: treesize reduction 264, result has 0.4 percent of original size [2022-12-14 09:00:11,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 133 treesize of output 90 [2022-12-14 09:00:13,306 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 93 treesize of output 97 [2022-12-14 09:00:13,347 INFO L321 Elim1Store]: treesize reduction 72, result has 43.3 percent of original size [2022-12-14 09:00:13,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 60 treesize of output 106 [2022-12-14 09:00:13,445 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 8 treesize of output 1 [2022-12-14 09:00:13,468 INFO L321 Elim1Store]: treesize reduction 348, result has 0.3 percent of original size [2022-12-14 09:00:13,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 143 treesize of output 93 [2022-12-14 09:00:15,008 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 105 treesize of output 107 [2022-12-14 09:00:15,055 INFO L321 Elim1Store]: treesize reduction 100, result has 35.5 percent of original size [2022-12-14 09:00:15,055 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 70 treesize of output 121 [2022-12-14 09:00:15,147 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 8 treesize of output 1 [2022-12-14 09:00:15,199 INFO L321 Elim1Store]: treesize reduction 240, result has 0.4 percent of original size [2022-12-14 09:00:15,199 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 18 case distinctions, treesize of input 107 treesize of output 62 [2022-12-14 09:00:16,876 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 117 treesize of output 117 [2022-12-14 09:00:16,915 INFO L321 Elim1Store]: treesize reduction 128, result has 30.1 percent of original size [2022-12-14 09:00:16,915 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 12 case distinctions, treesize of input 80 treesize of output 136 [2022-12-14 09:00:17,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 149 treesize of output 123 [2022-12-14 09:00:17,051 INFO L321 Elim1Store]: treesize reduction 296, result has 0.3 percent of original size [2022-12-14 09:00:17,051 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 123 treesize of output 65 [2022-12-14 09:00:17,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 132 treesize of output 128 [2022-12-14 09:00:17,365 INFO L321 Elim1Store]: treesize reduction 152, result has 25.1 percent of original size [2022-12-14 09:00:17,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 95 treesize of output 146 [2022-12-14 09:00:17,478 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 8 treesize of output 1 [2022-12-14 09:00:17,495 INFO L321 Elim1Store]: treesize reduction 344, result has 0.3 percent of original size [2022-12-14 09:00:17,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 138 treesize of output 68 [2022-12-14 09:01:44,425 INFO L321 Elim1Store]: treesize reduction 391, result has 64.0 percent of original size [2022-12-14 09:01:44,425 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 13 select indices, 13 select index equivalence classes, 0 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 78 case distinctions, treesize of input 266 treesize of output 801 [2022-12-14 09:01:53,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 852 proven. 349 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:53,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:01:57,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2022-12-14 09:03:10,951 WARN L207 Elim1Store]: Array PQE input equivalent to true