./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/rew.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/rew.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7 --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 a4dbd52ad78119a422ea606f98f820bbe5495fb5a7cf8886c665da2d1f9b569e --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:06:14,123 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:06:14,126 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:06:14,162 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:06:14,162 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:06:14,164 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:06:14,165 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:06:14,168 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:06:14,170 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:06:14,171 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:06:14,172 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:06:14,174 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:06:14,174 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:06:14,176 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:06:14,177 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:06:14,179 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:06:14,180 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:06:14,181 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:06:14,184 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:06:14,186 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:06:14,188 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:06:14,190 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:06:14,191 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:06:14,192 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:06:14,196 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:06:14,197 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:06:14,197 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:06:14,198 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:06:14,199 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:06:14,200 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:06:14,201 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:06:14,202 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:06:14,202 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:06:14,203 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:06:14,205 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:06:14,205 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:06:14,206 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:06:14,206 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:06:14,206 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:06:14,207 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:06:14,208 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:06:14,209 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:06:14,235 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:06:14,236 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:06:14,236 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:06:14,236 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:06:14,237 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:06:14,237 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:06:14,237 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:06:14,237 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:06:14,238 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:06:14,238 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:06:14,238 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:06:14,238 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:06:14,238 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:06:14,238 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:06:14,239 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:06:14,239 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:06:14,239 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:06:14,239 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:06:14,240 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:06:14,240 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:06:14,240 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:06:14,241 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:06:14,241 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:06:14,241 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:06:14,241 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:06:14,241 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:06:14,241 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:06:14,242 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:06:14,242 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:06:14,242 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:06:14,242 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:06:14,242 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:06:14,243 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:06:14,243 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:06:14,243 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:06:14,243 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:06:14,243 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:06:14,244 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:06:14,244 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:06:14,244 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:06:14,244 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:06:14,244 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a4dbd52ad78119a422ea606f98f820bbe5495fb5a7cf8886c665da2d1f9b569e [2021-11-25 19:06:14,545 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:06:14,573 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:06:14,576 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:06:14,577 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:06:14,578 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:06:14,579 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-tiling/rew.c [2021-11-25 19:06:14,651 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/data/99ab2aa22/18d98d82b06d409b852ee86752432ffa/FLAGdedd6ec92 [2021-11-25 19:06:15,083 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:06:15,084 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/sv-benchmarks/c/array-tiling/rew.c [2021-11-25 19:06:15,090 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/data/99ab2aa22/18d98d82b06d409b852ee86752432ffa/FLAGdedd6ec92 [2021-11-25 19:06:15,490 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/data/99ab2aa22/18d98d82b06d409b852ee86752432ffa [2021-11-25 19:06:15,493 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:06:15,496 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:06:15,501 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:06:15,501 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:06:15,505 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:06:15,506 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,508 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@726877e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15, skipping insertion in model container [2021-11-25 19:06:15,509 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,516 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:06:15,531 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:06:15,754 WARN L230 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_bc2f5fce-3559-4491-abe5-543a18104c51/sv-benchmarks/c/array-tiling/rew.c[394,407] [2021-11-25 19:06:15,767 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:06:15,775 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:06:15,786 WARN L230 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_bc2f5fce-3559-4491-abe5-543a18104c51/sv-benchmarks/c/array-tiling/rew.c[394,407] [2021-11-25 19:06:15,792 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:06:15,805 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:06:15,805 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15 WrapperNode [2021-11-25 19:06:15,805 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:06:15,807 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:06:15,807 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:06:15,807 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:06:15,814 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,821 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,839 INFO L137 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 58 [2021-11-25 19:06:15,839 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:06:15,840 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:06:15,840 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:06:15,840 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:06:15,848 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,848 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,850 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,850 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,855 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,859 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,860 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,862 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:06:15,863 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:06:15,863 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:06:15,863 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:06:15,864 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:06:15,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:15,911 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:06:15,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:06:15,961 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:06:15,962 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:06:15,962 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 19:06:15,962 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 19:06:15,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:06:15,962 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:06:15,962 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 19:06:16,034 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:06:16,036 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:06:16,203 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:06:16,260 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:06:16,260 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 19:06:16,262 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:06:16 BoogieIcfgContainer [2021-11-25 19:06:16,263 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:06:16,264 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:06:16,266 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:06:16,269 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:06:16,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:06:15" (1/3) ... [2021-11-25 19:06:16,270 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@345ffd7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:06:16, skipping insertion in model container [2021-11-25 19:06:16,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (2/3) ... [2021-11-25 19:06:16,271 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@345ffd7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:06:16, skipping insertion in model container [2021-11-25 19:06:16,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:06:16" (3/3) ... [2021-11-25 19:06:16,272 INFO L111 eAbstractionObserver]: Analyzing ICFG rew.c [2021-11-25 19:06:16,277 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:06:16,278 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:06:16,348 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:06:16,360 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=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, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:06:16,360 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:06:16,385 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) [2021-11-25 19:06:16,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:06:16,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:16,397 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 19:06:16,398 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:16,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:16,408 INFO L85 PathProgramCache]: Analyzing trace with hash -1740444559, now seen corresponding path program 1 times [2021-11-25 19:06:16,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:16,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277239388] [2021-11-25 19:06:16,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:16,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:16,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:16,682 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:16,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:16,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277239388] [2021-11-25 19:06:16,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277239388] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:16,685 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:16,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:06:16,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783598823] [2021-11-25 19:06:16,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:16,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:06:16,692 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:16,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:06:16,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:06:16,728 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) [2021-11-25 19:06:16,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:16,771 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2021-11-25 19:06:16,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:06:16,774 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 [2021-11-25 19:06:16,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:16,781 INFO L225 Difference]: With dead ends: 18 [2021-11-25 19:06:16,781 INFO L226 Difference]: Without dead ends: 9 [2021-11-25 19:06:16,784 INFO L932 BasicCegarLoop]: 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 [2021-11-25 19:06:16,790 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:16,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:06:16,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-25 19:06:16,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-25 19:06:16,820 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) [2021-11-25 19:06:16,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-11-25 19:06:16,822 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2021-11-25 19:06:16,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:16,823 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-11-25 19:06:16,824 INFO L471 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) [2021-11-25 19:06:16,825 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-11-25 19:06:16,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 19:06:16,826 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:16,826 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:16,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:06:16,827 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:16,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:16,830 INFO L85 PathProgramCache]: Analyzing trace with hash 1884425115, now seen corresponding path program 1 times [2021-11-25 19:06:16,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:16,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823609429] [2021-11-25 19:06:16,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:16,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:16,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:16,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:16,954 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:16,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823609429] [2021-11-25 19:06:16,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823609429] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:16,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352380414] [2021-11-25 19:06:16,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:16,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:16,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:16,959 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:16,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:06:17,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:17,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:06:17,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:17,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:17,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:17,236 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:17,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352380414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:17,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1266745778] [2021-11-25 19:06:17,267 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 19:06:17,268 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:17,272 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:17,278 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:17,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:17,516 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:17,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:17,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:06:17,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:17,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 188 [2021-11-25 19:06:17,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 110 treesize of output 57 [2021-11-25 19:06:17,884 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:18,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,262 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-25 19:06:18,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 case distinctions, treesize of input 387 treesize of output 443 [2021-11-25 19:06:18,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,528 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-25 19:06:18,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 447 treesize of output 373 [2021-11-25 19:06:18,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:18,760 INFO L354 Elim1Store]: treesize reduction 118, result has 0.8 percent of original size [2021-11-25 19:06:18,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 31 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 24 case distinctions, treesize of input 458 treesize of output 351 [2021-11-25 19:06:19,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:19,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:19,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 36 [2021-11-25 19:06:19,047 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:19,312 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '95#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= ~MAX~0 100000) (= (ite (<= |ULTIMATE.start_main_~low~0#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (= (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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:19,312 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:19,312 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:19,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-25 19:06:19,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853262747] [2021-11-25 19:06:19,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:19,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:06:19,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:19,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:06:19,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:06:19,315 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:19,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:19,348 INFO L93 Difference]: Finished difference Result 15 states and 17 transitions. [2021-11-25 19:06:19,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:06:19,349 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 19:06:19,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:19,351 INFO L225 Difference]: With dead ends: 15 [2021-11-25 19:06:19,351 INFO L226 Difference]: Without dead ends: 10 [2021-11-25 19:06:19,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:06:19,357 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:19,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 14 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:06:19,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-25 19:06:19,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-25 19:06:19,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:19,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-25 19:06:19,364 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2021-11-25 19:06:19,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:19,364 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-25 19:06:19,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:19,365 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-25 19:06:19,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:06:19,366 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:19,366 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:19,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:19,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-25 19:06:19,581 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:19,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:19,582 INFO L85 PathProgramCache]: Analyzing trace with hash -1708731983, now seen corresponding path program 2 times [2021-11-25 19:06:19,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:19,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470983538] [2021-11-25 19:06:19,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:19,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:19,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:19,748 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:19,748 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:19,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470983538] [2021-11-25 19:06:19,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [470983538] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:19,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186687850] [2021-11-25 19:06:19,749 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:06:19,749 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:19,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:19,750 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:19,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:06:19,801 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 19:06:19,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:06:19,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 19:06:19,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:19,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:06:19,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 16 [2021-11-25 19:06:19,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 42 treesize of output 42 [2021-11-25 19:06:19,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:19,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 42 treesize of output 46 [2021-11-25 19:06:19,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 7 treesize of output 3 [2021-11-25 19:06:20,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 15 treesize of output 7 [2021-11-25 19:06:20,121 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:20,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:20,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 19 [2021-11-25 19:06:20,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 154 treesize of output 150 [2021-11-25 19:06:20,340 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:20,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [186687850] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:20,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1434879975] [2021-11-25 19:06:20,343 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 19:06:20,343 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:20,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:20,344 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:20,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:20,418 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:20,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:20,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:06:20,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-25 19:06:20,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,635 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:20,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:20,640 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:20,771 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-25 19:06:20,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 30 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 379 treesize of output 460 [2021-11-25 19:06:21,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:21,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:21,216 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:21,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:21,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:21,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:21,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:21,220 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:21,227 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 19:06:21,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 423 treesize of output 352 [2021-11-25 19:06:21,481 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:21,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:21,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:21,527 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:21,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 149 treesize of output 82 [2021-11-25 19:06:21,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 122 treesize of output 69 [2021-11-25 19:06:21,675 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:21,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 133 treesize of output 76 [2021-11-25 19:06:21,804 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:21,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:21,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 79 [2021-11-25 19:06:22,371 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:22,399 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:22,448 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:22,479 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:22,534 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:22,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:22,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:22,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:22,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 158 treesize of output 85 [2021-11-25 19:06:22,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:22,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:22,714 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:22,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:22,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:22,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:22,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:22,718 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:22,725 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 19:06:22,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 434 treesize of output 345 [2021-11-25 19:06:23,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:23,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:23,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 36 [2021-11-25 19:06:23,064 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:23,342 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '192#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= ~MAX~0 100000) (= (ite (<= |ULTIMATE.start_main_~low~0#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (= (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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:23,342 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:23,342 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:23,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2021-11-25 19:06:23,342 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666492578] [2021-11-25 19:06:23,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:23,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 19:06:23,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:23,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 19:06:23,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:06:23,344 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 16 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:23,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:23,556 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2021-11-25 19:06:23,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:06:23,557 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 19:06:23,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:23,557 INFO L225 Difference]: With dead ends: 16 [2021-11-25 19:06:23,558 INFO L226 Difference]: Without dead ends: 14 [2021-11-25 19:06:23,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=132, Invalid=518, Unknown=0, NotChecked=0, Total=650 [2021-11-25 19:06:23,559 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 10 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 4 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:23,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 24 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 79 Invalid, 0 Unknown, 4 Unchecked, 0.1s Time] [2021-11-25 19:06:23,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-25 19:06:23,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 12. [2021-11-25 19:06:23,562 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) [2021-11-25 19:06:23,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-25 19:06:23,563 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2021-11-25 19:06:23,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:23,563 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-25 19:06:23,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:23,564 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-25 19:06:23,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:06:23,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:23,564 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:23,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:23,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:23,781 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:23,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:23,782 INFO L85 PathProgramCache]: Analyzing trace with hash -876836285, now seen corresponding path program 1 times [2021-11-25 19:06:23,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:23,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843263310] [2021-11-25 19:06:23,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:23,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:23,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:24,023 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:24,024 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:24,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843263310] [2021-11-25 19:06:24,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843263310] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:24,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568216190] [2021-11-25 19:06:24,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:24,025 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:24,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:24,026 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:24,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:06:24,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:24,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 19:06:24,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:24,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:06:24,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 15 treesize of output 7 [2021-11-25 19:06:24,275 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:24,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:24,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 14 [2021-11-25 19:06:24,359 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 32 treesize of output 28 [2021-11-25 19:06:24,412 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:24,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568216190] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:24,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [876058546] [2021-11-25 19:06:24,415 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:06:24,415 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:24,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:24,416 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:24,416 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:24,487 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 19:06:24,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 44 [2021-11-25 19:06:24,535 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:24,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:24,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-25 19:06:24,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,698 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:24,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:24,704 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:24,824 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-25 19:06:24,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 379 treesize of output 460 [2021-11-25 19:06:25,178 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:25,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 75 [2021-11-25 19:06:25,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:25,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,404 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:25,415 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 19:06:25,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 756 treesize of output 629 [2021-11-25 19:06:25,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,774 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:25,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,780 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:25,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:25,811 INFO L354 Elim1Store]: treesize reduction 101, result has 2.9 percent of original size [2021-11-25 19:06:25,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 23 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 26 case distinctions, treesize of input 767 treesize of output 639 [2021-11-25 19:06:26,818 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:26,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:26,821 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:26,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:26,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:26,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:26,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:26,826 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:26,832 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 19:06:26,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 18 disjoint index pairs (out of 55 index pairs), introduced 10 new quantified variables, introduced 24 case distinctions, treesize of input 441 treesize of output 364 [2021-11-25 19:06:26,966 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:27,002 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:27,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,059 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:27,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,081 INFO L354 Elim1Store]: treesize reduction 96, result has 1.0 percent of original size [2021-11-25 19:06:27,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 25 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 25 case distinctions, treesize of input 778 treesize of output 669 [2021-11-25 19:06:27,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:27,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:27,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 36 [2021-11-25 19:06:27,608 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:28,146 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '325#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:28,147 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:28,147 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:28,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2021-11-25 19:06:28,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602160137] [2021-11-25 19:06:28,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:28,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 19:06:28,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:28,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 19:06:28,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=518, Unknown=0, NotChecked=0, Total=600 [2021-11-25 19:06:28,149 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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) [2021-11-25 19:06:28,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:28,348 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-11-25 19:06:28,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:06:28,349 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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 11 [2021-11-25 19:06:28,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:28,350 INFO L225 Difference]: With dead ends: 27 [2021-11-25 19:06:28,350 INFO L226 Difference]: Without dead ends: 25 [2021-11-25 19:06:28,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2021-11-25 19:06:28,352 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 18 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:28,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 48 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:06:28,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-25 19:06:28,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2021-11-25 19:06:28,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:28,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-25 19:06:28,357 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2021-11-25 19:06:28,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:28,358 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-25 19:06:28,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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) [2021-11-25 19:06:28,358 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-25 19:06:28,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 19:06:28,359 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:28,359 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:28,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:28,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:28,585 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:28,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:28,586 INFO L85 PathProgramCache]: Analyzing trace with hash -755739303, now seen corresponding path program 2 times [2021-11-25 19:06:28,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:28,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760965576] [2021-11-25 19:06:28,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:28,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:28,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:28,873 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:28,873 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:28,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760965576] [2021-11-25 19:06:28,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760965576] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:28,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377880305] [2021-11-25 19:06:28,874 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:06:28,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:28,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:28,875 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:28,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:06:28,934 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 19:06:28,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:06:28,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 19:06:28,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:28,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:06:29,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 22 [2021-11-25 19:06:29,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 65 treesize of output 61 [2021-11-25 19:06:29,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 61 treesize of output 57 [2021-11-25 19:06:29,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,124 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 18 [2021-11-25 19:06:29,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,386 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:06:29,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 10 [2021-11-25 19:06:29,414 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:29,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:29,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 21 [2021-11-25 19:06:29,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 82 treesize of output 78 [2021-11-25 19:06:29,643 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:29,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [377880305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:29,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1406637691] [2021-11-25 19:06:29,646 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:06:29,646 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:29,646 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:29,646 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:29,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:29,718 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:29,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:29,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:06:29,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-25 19:06:29,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,888 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:29,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:29,893 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:30,016 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-25 19:06:30,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 379 treesize of output 460 [2021-11-25 19:06:30,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:30,368 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:30,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:30,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:30,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:30,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:30,373 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:30,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:30,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:30,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:30,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:30,407 INFO L354 Elim1Store]: treesize reduction 90, result has 13.5 percent of original size [2021-11-25 19:06:30,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 23 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 26 case distinctions, treesize of input 1114 treesize of output 1018 [2021-11-25 19:06:31,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,125 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:31,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,166 INFO L354 Elim1Store]: treesize reduction 96, result has 1.0 percent of original size [2021-11-25 19:06:31,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 25 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 25 case distinctions, treesize of input 1125 treesize of output 916 [2021-11-25 19:06:31,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:31,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:31,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-25 19:06:31,890 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:32,342 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '489#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:32,342 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:32,342 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:32,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2021-11-25 19:06:32,342 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700132300] [2021-11-25 19:06:32,342 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:32,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 19:06:32,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:32,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 19:06:32,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=662, Unknown=0, NotChecked=0, Total=756 [2021-11-25 19:06:32,344 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:32,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:32,829 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2021-11-25 19:06:32,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:06:32,829 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-25 19:06:32,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:32,830 INFO L225 Difference]: With dead ends: 25 [2021-11-25 19:06:32,830 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 19:06:32,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=234, Invalid=1326, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 19:06:32,832 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 27 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:32,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 43 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 97 Invalid, 0 Unknown, 40 Unchecked, 0.1s Time] [2021-11-25 19:06:32,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 19:06:32,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2021-11-25 19:06:32,837 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) [2021-11-25 19:06:32,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-25 19:06:32,837 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2021-11-25 19:06:32,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:32,838 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-25 19:06:32,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:32,838 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-25 19:06:32,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 19:06:32,839 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:32,839 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-25 19:06:32,859 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-25 19:06:33,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:33,045 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:33,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:33,046 INFO L85 PathProgramCache]: Analyzing trace with hash 166604913, now seen corresponding path program 3 times [2021-11-25 19:06:33,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:33,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394964626] [2021-11-25 19:06:33,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:33,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:33,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:33,142 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:33,142 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:33,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394964626] [2021-11-25 19:06:33,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [394964626] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:33,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802663065] [2021-11-25 19:06:33,143 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:06:33,143 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:33,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:33,144 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:33,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:06:33,197 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:06:33,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:06:33,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:06:33,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:33,271 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:33,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:33,305 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:33,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802663065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:33,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [630979350] [2021-11-25 19:06:33,307 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:06:33,307 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:33,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:33,308 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:33,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:33,368 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 19:06:33,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 44 [2021-11-25 19:06:33,407 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:33,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:33,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-25 19:06:33,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,550 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:33,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,555 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:33,674 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-25 19:06:33,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 30 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 379 treesize of output 460 [2021-11-25 19:06:33,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,855 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:33,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 152 treesize of output 81 [2021-11-25 19:06:33,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:33,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 143 treesize of output 78 [2021-11-25 19:06:33,966 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:34,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 75 [2021-11-25 19:06:34,111 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:34,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 82 [2021-11-25 19:06:34,294 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:34,324 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:34,388 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:34,402 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:34,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:34,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:34,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:34,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 75 [2021-11-25 19:06:34,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:34,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:34,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-25 19:06:34,720 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:35,101 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '667#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:35,101 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:35,101 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:35,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-25 19:06:35,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636309267] [2021-11-25 19:06:35,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:35,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:06:35,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:35,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:06:35,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-11-25 19:06:35,104 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) [2021-11-25 19:06:35,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:35,172 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-25 19:06:35,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:06:35,173 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 [2021-11-25 19:06:35,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:35,173 INFO L225 Difference]: With dead ends: 34 [2021-11-25 19:06:35,173 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 19:06:35,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:06:35,175 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:35,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 27 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:06:35,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 19:06:35,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2021-11-25 19:06:35,180 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) [2021-11-25 19:06:35,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-25 19:06:35,181 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2021-11-25 19:06:35,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:35,181 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-25 19:06:35,181 INFO L471 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) [2021-11-25 19:06:35,181 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-25 19:06:35,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 19:06:35,182 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:35,182 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-25 19:06:35,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:35,385 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 19:06:35,385 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:35,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:35,386 INFO L85 PathProgramCache]: Analyzing trace with hash -5732965, now seen corresponding path program 4 times [2021-11-25 19:06:35,386 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:35,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174416664] [2021-11-25 19:06:35,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:35,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:35,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:35,526 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:35,526 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:35,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174416664] [2021-11-25 19:06:35,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [174416664] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:35,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77064652] [2021-11-25 19:06:35,527 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:06:35,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:35,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:35,527 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:35,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:06:35,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:35,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 19:06:35,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:35,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:06:35,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 7 [2021-11-25 19:06:35,823 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:35,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:35,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 14 [2021-11-25 19:06:35,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 32 treesize of output 28 [2021-11-25 19:06:35,997 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:35,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77064652] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:35,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1748220016] [2021-11-25 19:06:35,999 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:06:35,999 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:36,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:36,000 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:36,000 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:36,059 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:36,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:36,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:06:36,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 188 [2021-11-25 19:06:36,163 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:36,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 139 treesize of output 74 [2021-11-25 19:06:36,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,364 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-25 19:06:36,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 case distinctions, treesize of input 387 treesize of output 443 [2021-11-25 19:06:36,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,463 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-25 19:06:36,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 447 treesize of output 365 [2021-11-25 19:06:36,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,656 INFO L354 Elim1Store]: treesize reduction 118, result has 0.8 percent of original size [2021-11-25 19:06:36,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 31 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 24 case distinctions, treesize of input 458 treesize of output 359 [2021-11-25 19:06:36,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:36,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:36,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 36 [2021-11-25 19:06:36,975 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:37,459 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '855#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:37,459 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:37,459 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:37,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 25 [2021-11-25 19:06:37,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240384801] [2021-11-25 19:06:37,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:37,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 19:06:37,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:37,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 19:06:37,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=833, Unknown=0, NotChecked=0, Total=930 [2021-11-25 19:06:37,462 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:37,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:37,727 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-25 19:06:37,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:06:37,728 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 19:06:37,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:37,729 INFO L225 Difference]: With dead ends: 34 [2021-11-25 19:06:37,729 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 19:06:37,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=163, Invalid=1243, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 19:06:37,731 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 30 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:37,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 70 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:06:37,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 19:06:37,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 20. [2021-11-25 19:06:37,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:37,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-25 19:06:37,737 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2021-11-25 19:06:37,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:37,737 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-25 19:06:37,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:37,738 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-25 19:06:37,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 19:06:37,739 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:37,739 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-25 19:06:37,773 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-25 19:06:37,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 19:06:37,962 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:37,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:37,963 INFO L85 PathProgramCache]: Analyzing trace with hash -1053239887, now seen corresponding path program 5 times [2021-11-25 19:06:37,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:37,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410172845] [2021-11-25 19:06:37,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:37,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:37,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:38,154 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:38,155 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:38,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410172845] [2021-11-25 19:06:38,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410172845] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:38,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959187871] [2021-11-25 19:06:38,155 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:06:38,155 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:38,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:38,157 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:38,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:06:38,234 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 19:06:38,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:06:38,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 19:06:38,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:38,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:06:38,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 16 [2021-11-25 19:06:38,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 53 treesize of output 53 [2021-11-25 19:06:38,402 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:06:38,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 53 treesize of output 57 [2021-11-25 19:06:38,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:38,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-11-25 19:06:39,682 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-25 19:06:39,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 30 treesize of output 10 [2021-11-25 19:06:39,716 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:39,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:39,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 21 [2021-11-25 19:06:39,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 82 treesize of output 78 [2021-11-25 19:06:40,033 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:40,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959187871] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:40,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1618318571] [2021-11-25 19:06:40,035 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:06:40,035 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:40,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:40,035 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:40,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:40,096 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:40,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:40,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:06:40,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-25 19:06:40,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,253 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:40,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,258 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:40,379 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-25 19:06:40,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 30 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 379 treesize of output 460 [2021-11-25 19:06:40,637 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:40,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,665 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:40,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 138 treesize of output 75 [2021-11-25 19:06:40,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:40,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 133 treesize of output 76 [2021-11-25 19:06:40,803 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:40,905 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:40,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 133 treesize of output 76 [2021-11-25 19:06:40,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 122 treesize of output 69 [2021-11-25 19:06:41,153 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:41,173 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:41,200 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:41,221 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:41,276 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:41,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:41,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:41,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:41,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 165 treesize of output 88 [2021-11-25 19:06:41,380 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:41,412 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:41,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:41,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:41,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-25 19:06:41,668 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:42,200 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1069#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:42,200 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:42,200 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:42,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 28 [2021-11-25 19:06:42,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927029783] [2021-11-25 19:06:42,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:42,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 19:06:42,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:42,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 19:06:42,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1010, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 19:06:42,202 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:45,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:45,748 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-11-25 19:06:45,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 19:06:45,748 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-25 19:06:45,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:45,749 INFO L225 Difference]: With dead ends: 32 [2021-11-25 19:06:45,749 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 19:06:45,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=307, Invalid=2141, Unknown=2, NotChecked=0, Total=2450 [2021-11-25 19:06:45,751 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 28 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:45,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 85 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 168 Invalid, 0 Unknown, 96 Unchecked, 0.1s Time] [2021-11-25 19:06:45,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 19:06:45,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 19. [2021-11-25 19:06:45,755 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) [2021-11-25 19:06:45,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-11-25 19:06:45,756 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2021-11-25 19:06:45,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:45,756 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-11-25 19:06:45,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:45,756 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-11-25 19:06:45,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 19:06:45,757 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:45,757 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-25 19:06:45,776 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-25 19:06:45,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 19:06:45,958 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:45,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:45,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1013208601, now seen corresponding path program 6 times [2021-11-25 19:06:45,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:45,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228331733] [2021-11-25 19:06:45,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:45,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:46,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:46,093 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:46,093 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:46,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228331733] [2021-11-25 19:06:46,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1228331733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:46,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047096492] [2021-11-25 19:06:46,094 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:06:46,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:46,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:46,095 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:46,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:06:46,148 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:06:46,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:06:46,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:06:46,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:46,247 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:46,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:46,293 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:46,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1047096492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:46,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [372464938] [2021-11-25 19:06:46,296 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:06:46,296 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:46,296 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:46,297 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:46,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:46,353 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 19:06:46,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 44 [2021-11-25 19:06:46,402 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:46,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:46,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-25 19:06:46,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,544 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:46,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:46,549 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:46,644 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-25 19:06:46,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 379 treesize of output 460 [2021-11-25 19:06:46,980 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:47,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 75 [2021-11-25 19:06:47,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 75 [2021-11-25 19:06:47,161 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:47,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:47,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:47,275 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:47,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 163 treesize of output 88 [2021-11-25 19:06:47,331 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:47,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 82 [2021-11-25 19:06:47,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:47,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 85 [2021-11-25 19:06:47,580 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:47,844 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:47,863 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:47,911 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:47,946 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:47,967 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:48,006 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:48,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:48,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:48,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:48,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 144 treesize of output 79 [2021-11-25 19:06:48,084 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:48,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:48,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:48,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-25 19:06:48,331 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:48,726 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1298#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:48,726 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:48,727 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:48,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2021-11-25 19:06:48,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200310060] [2021-11-25 19:06:48,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:48,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 19:06:48,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:48,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 19:06:48,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:06:48,729 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) [2021-11-25 19:06:48,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:48,830 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-25 19:06:48,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 19:06:48,831 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 [2021-11-25 19:06:48,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:48,831 INFO L225 Difference]: With dead ends: 41 [2021-11-25 19:06:48,831 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 19:06:48,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2021-11-25 19:06:48,833 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 24 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:48,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 39 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:06:48,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 19:06:48,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2021-11-25 19:06:48,838 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) [2021-11-25 19:06:48,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-25 19:06:48,839 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2021-11-25 19:06:48,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:48,839 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-25 19:06:48,839 INFO L471 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) [2021-11-25 19:06:48,839 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-25 19:06:48,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 19:06:48,840 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:48,840 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-25 19:06:48,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:49,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:49,061 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:49,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:49,061 INFO L85 PathProgramCache]: Analyzing trace with hash 1966868035, now seen corresponding path program 7 times [2021-11-25 19:06:49,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:49,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783324460] [2021-11-25 19:06:49,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:49,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:49,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:49,317 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:49,317 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:49,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783324460] [2021-11-25 19:06:49,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783324460] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:49,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240975776] [2021-11-25 19:06:49,318 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:06:49,318 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:49,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:49,325 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:49,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:06:49,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:49,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 19:06:49,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:49,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:06:49,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 7 [2021-11-25 19:06:49,656 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:49,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:49,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 14 [2021-11-25 19:06:49,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 32 treesize of output 28 [2021-11-25 19:06:49,862 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:49,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240975776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:49,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1355803499] [2021-11-25 19:06:49,864 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:06:49,864 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:49,864 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:49,864 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:49,865 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:49,927 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:49,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:49,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:06:49,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:49,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-25 19:06:50,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,074 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:50,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,079 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:50,192 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-25 19:06:50,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 379 treesize of output 460 [2021-11-25 19:06:50,353 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:50,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 79 [2021-11-25 19:06:50,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 129 treesize of output 72 [2021-11-25 19:06:50,461 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:50,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:50,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 151 treesize of output 84 [2021-11-25 19:06:50,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 153 treesize of output 84 [2021-11-25 19:06:50,639 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:50,672 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:50,686 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:50,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:50,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:50,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-25 19:06:50,920 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:51,407 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1534#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:51,407 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:51,408 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:51,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 31 [2021-11-25 19:06:51,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592176093] [2021-11-25 19:06:51,408 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:51,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 19:06:51,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:51,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 19:06:51,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1204, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 19:06:51,410 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 31 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) [2021-11-25 19:06:51,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:51,794 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-25 19:06:51,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 19:06:51,795 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 31 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-25 19:06:51,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:51,795 INFO L225 Difference]: With dead ends: 41 [2021-11-25 19:06:51,795 INFO L226 Difference]: Without dead ends: 39 [2021-11-25 19:06:51,796 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=195, Invalid=1697, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 19:06:51,797 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 32 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:51,797 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 102 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:06:51,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-25 19:06:51,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 24. [2021-11-25 19:06:51,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:51,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-11-25 19:06:51,812 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 19 [2021-11-25 19:06:51,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:51,812 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-11-25 19:06:51,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 31 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) [2021-11-25 19:06:51,813 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-11-25 19:06:51,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 19:06:51,813 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:51,814 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-25 19:06:51,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:52,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 19:06:52,014 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:52,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:52,014 INFO L85 PathProgramCache]: Analyzing trace with hash 1465539417, now seen corresponding path program 8 times [2021-11-25 19:06:52,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:52,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692212080] [2021-11-25 19:06:52,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:52,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:52,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:52,272 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:52,272 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:52,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692212080] [2021-11-25 19:06:52,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692212080] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:52,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776101952] [2021-11-25 19:06:52,272 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:06:52,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:52,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:52,273 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:52,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:06:52,356 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 19:06:52,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:06:52,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-25 19:06:52,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:52,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:06:52,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 22 [2021-11-25 19:06:52,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 65 treesize of output 61 [2021-11-25 19:06:52,540 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:06:52,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 61 treesize of output 57 [2021-11-25 19:06:52,555 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-25 19:06:52,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 18 [2021-11-25 19:06:52,991 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-25 19:06:52,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 36 treesize of output 10 [2021-11-25 19:06:53,029 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:53,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:53,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 21 [2021-11-25 19:06:53,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 82 treesize of output 78 [2021-11-25 19:06:53,409 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:53,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [776101952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:53,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1906719264] [2021-11-25 19:06:53,411 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:06:53,411 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:53,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:53,411 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:53,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:53,469 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:53,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:53,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:06:53,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-25 19:06:53,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,587 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:53,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,591 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:53,732 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-25 19:06:53,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 30 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 379 treesize of output 460 [2021-11-25 19:06:53,857 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:53,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 79 [2021-11-25 19:06:53,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 129 treesize of output 72 [2021-11-25 19:06:53,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:53,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 75 [2021-11-25 19:06:54,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:54,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:54,052 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:06:54,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 145 treesize of output 78 [2021-11-25 19:06:54,093 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:54,247 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:54,260 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:54,321 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:54,333 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:54,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:54,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:54,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:54,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 78 [2021-11-25 19:06:54,420 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:54,456 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:54,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:54,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:54,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-25 19:06:54,739 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:55,364 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1794#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:55,364 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:55,364 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:55,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 34 [2021-11-25 19:06:55,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187254289] [2021-11-25 19:06:55,365 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:55,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 19:06:55,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:55,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 19:06:55,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1420, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 19:06:55,366 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 34 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:56,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:56,311 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2021-11-25 19:06:56,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 19:06:56,312 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 34 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-25 19:06:56,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:56,313 INFO L225 Difference]: With dead ends: 39 [2021-11-25 19:06:56,313 INFO L226 Difference]: Without dead ends: 37 [2021-11-25 19:06:56,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 733 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=390, Invalid=3150, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 19:06:56,315 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 45 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:56,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 138 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 260 Invalid, 0 Unknown, 142 Unchecked, 0.2s Time] [2021-11-25 19:06:56,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-25 19:06:56,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 23. [2021-11-25 19:06:56,321 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) [2021-11-25 19:06:56,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-25 19:06:56,322 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2021-11-25 19:06:56,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:56,322 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-25 19:06:56,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 34 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:06:56,322 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-25 19:06:56,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 19:06:56,323 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:56,323 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-25 19:06:56,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:56,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 19:06:56,548 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:56,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:56,548 INFO L85 PathProgramCache]: Analyzing trace with hash -1267911567, now seen corresponding path program 9 times [2021-11-25 19:06:56,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:56,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747514958] [2021-11-25 19:06:56,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:56,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:56,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:56,659 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:56,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:56,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747514958] [2021-11-25 19:06:56,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747514958] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:56,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2008133322] [2021-11-25 19:06:56,659 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:06:56,660 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:56,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:56,660 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:56,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 19:06:56,717 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:06:56,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:06:56,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:06:56,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:56,850 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:56,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:56,899 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:56,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2008133322] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:56,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [798622710] [2021-11-25 19:06:56,900 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:06:56,900 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:56,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:56,901 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:56,901 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:56,957 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:56,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:56,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:06:56,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:56,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 188 [2021-11-25 19:06:57,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 43 [2021-11-25 19:06:57,036 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:57,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,193 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-25 19:06:57,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 case distinctions, treesize of input 387 treesize of output 443 [2021-11-25 19:06:57,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 78 [2021-11-25 19:06:57,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 78 [2021-11-25 19:06:57,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 187 treesize of output 96 [2021-11-25 19:06:57,466 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:57,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:06:57,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:57,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 36 [2021-11-25 19:06:57,698 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:58,177 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2075#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:06:58,178 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:06:58,178 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:06:58,178 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-25 19:06:58,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057826116] [2021-11-25 19:06:58,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:06:58,179 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 19:06:58,179 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:58,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 19:06:58,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=488, Unknown=0, NotChecked=0, Total=600 [2021-11-25 19:06:58,180 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) [2021-11-25 19:06:58,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:58,304 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-25 19:06:58,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:06:58,304 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 [2021-11-25 19:06:58,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:58,305 INFO L225 Difference]: With dead ends: 48 [2021-11-25 19:06:58,305 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 19:06:58,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=158, Invalid=654, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:06:58,306 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 36 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:58,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 33 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:06:58,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 19:06:58,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2021-11-25 19:06:58,313 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) [2021-11-25 19:06:58,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-11-25 19:06:58,314 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2021-11-25 19:06:58,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:58,314 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-11-25 19:06:58,314 INFO L471 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) [2021-11-25 19:06:58,314 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-11-25 19:06:58,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 19:06:58,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:58,315 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-25 19:06:58,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:58,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 19:06:58,533 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:58,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:58,533 INFO L85 PathProgramCache]: Analyzing trace with hash 1547485083, now seen corresponding path program 10 times [2021-11-25 19:06:58,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:58,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904195382] [2021-11-25 19:06:58,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:58,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:58,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:58,845 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:58,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:58,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904195382] [2021-11-25 19:06:58,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904195382] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:06:58,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767029344] [2021-11-25 19:06:58,845 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:06:58,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:58,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:58,846 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:58,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 19:06:58,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:58,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 19:06:58,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:59,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:06:59,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 7 [2021-11-25 19:06:59,316 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:59,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:59,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 14 [2021-11-25 19:06:59,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 32 treesize of output 28 [2021-11-25 19:06:59,670 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:06:59,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [767029344] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:59,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [300420513] [2021-11-25 19:06:59,672 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:06:59,672 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:59,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:59,672 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:59,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:59,729 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 19:06:59,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 44 [2021-11-25 19:06:59,773 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:06:59,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:06:59,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 188 [2021-11-25 19:06:59,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 114 treesize of output 61 [2021-11-25 19:06:59,852 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:06:59,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:06:59,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:00,061 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-25 19:07:00,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 case distinctions, treesize of input 387 treesize of output 443 [2021-11-25 19:07:00,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:00,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 169 treesize of output 90 [2021-11-25 19:07:00,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:00,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 157 treesize of output 87 [2021-11-25 19:07:00,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:00,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:00,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:00,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 84 [2021-11-25 19:07:00,373 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:07:00,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:07:00,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:00,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-25 19:07:00,592 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:07:01,214 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2359#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:07:01,214 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:07:01,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:07:01,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 37 [2021-11-25 19:07:01,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107450326] [2021-11-25 19:07:01,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:07:01,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 19:07:01,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:01,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 19:07:01,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1671, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 19:07:01,217 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 37 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) [2021-11-25 19:07:01,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:01,873 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-25 19:07:01,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 19:07:01,873 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 37 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 23 [2021-11-25 19:07:01,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:01,874 INFO L225 Difference]: With dead ends: 48 [2021-11-25 19:07:01,874 INFO L226 Difference]: Without dead ends: 46 [2021-11-25 19:07:01,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=239, Invalid=2623, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 19:07:01,876 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 27 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:01,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 177 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:07:01,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-25 19:07:01,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 28. [2021-11-25 19:07:01,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 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) [2021-11-25 19:07:01,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-11-25 19:07:01,884 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-11-25 19:07:01,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:01,884 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-11-25 19:07:01,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 37 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) [2021-11-25 19:07:01,884 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-11-25 19:07:01,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 19:07:01,885 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:01,885 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-25 19:07:01,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 19:07:02,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:02,102 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:02,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:02,102 INFO L85 PathProgramCache]: Analyzing trace with hash -1369531983, now seen corresponding path program 11 times [2021-11-25 19:07:02,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:02,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464585489] [2021-11-25 19:07:02,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:02,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:02,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:02,418 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:02,418 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:02,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464585489] [2021-11-25 19:07:02,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [464585489] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:07:02,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422693112] [2021-11-25 19:07:02,418 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:07:02,418 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:02,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:02,419 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:02,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 19:07:02,566 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 19:07:02,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:07:02,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 19:07:02,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:02,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:07:02,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 25 [2021-11-25 19:07:02,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 74 treesize of output 70 [2021-11-25 19:07:02,795 INFO L354 Elim1Store]: treesize reduction 40, result has 23.1 percent of original size [2021-11-25 19:07:02,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 70 treesize of output 60 [2021-11-25 19:07:02,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:02,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 18 [2021-11-25 19:07:03,416 INFO L354 Elim1Store]: treesize reduction 48, result has 5.9 percent of original size [2021-11-25 19:07:03,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 13 [2021-11-25 19:07:03,454 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 22 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:03,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:07:04,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 27 treesize of output 25 [2021-11-25 19:07:04,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 107 treesize of output 100 [2021-11-25 19:07:04,995 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 9 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:04,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [422693112] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:07:04,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2065336832] [2021-11-25 19:07:04,996 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:07:04,996 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:07:04,997 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:07:04,997 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:07:04,997 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:07:05,056 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:07:05,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:07:05,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:07:05,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-25 19:07:05,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,199 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:07:05,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,204 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:07:05,308 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-25 19:07:05,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 379 treesize of output 460 [2021-11-25 19:07:05,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,651 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:07:05,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:05,660 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:07:05,686 INFO L354 Elim1Store]: treesize reduction 90, result has 13.5 percent of original size [2021-11-25 19:07:05,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 26 case distinctions, treesize of input 1103 treesize of output 1035 [2021-11-25 19:07:06,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:07:06,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,262 INFO L354 Elim1Store]: treesize reduction 96, result has 1.0 percent of original size [2021-11-25 19:07:06,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 25 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 25 case distinctions, treesize of input 1114 treesize of output 885 [2021-11-25 19:07:06,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:07:06,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:06,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 36 [2021-11-25 19:07:07,029 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:07:07,651 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2673#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:07:07,651 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:07:07,651 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:07:07,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 40 [2021-11-25 19:07:07,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275890546] [2021-11-25 19:07:07,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:07:07,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 19:07:07,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:07,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 19:07:07,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1829, Unknown=1, NotChecked=0, Total=2070 [2021-11-25 19:07:07,653 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 40 states, 40 states have (on average 1.675) internal successors, (67), 40 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:08,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:08,502 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2021-11-25 19:07:08,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 19:07:08,502 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 40 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-25 19:07:08,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:08,503 INFO L225 Difference]: With dead ends: 58 [2021-11-25 19:07:08,503 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 19:07:08,505 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 799 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=454, Invalid=3577, Unknown=1, NotChecked=0, Total=4032 [2021-11-25 19:07:08,505 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 9 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:08,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 84 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 60 Invalid, 0 Unknown, 73 Unchecked, 0.0s Time] [2021-11-25 19:07:08,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 19:07:08,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-25 19:07:08,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:08,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-11-25 19:07:08,514 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 24 [2021-11-25 19:07:08,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:08,514 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-11-25 19:07:08,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 40 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:08,514 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-11-25 19:07:08,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 19:07:08,515 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:08,515 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-25 19:07:08,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 19:07:08,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:08,729 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:08,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:08,729 INFO L85 PathProgramCache]: Analyzing trace with hash -1602747813, now seen corresponding path program 12 times [2021-11-25 19:07:08,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:08,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448400264] [2021-11-25 19:07:08,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:08,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:08,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:09,044 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:09,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:09,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448400264] [2021-11-25 19:07:09,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448400264] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:07:09,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602389068] [2021-11-25 19:07:09,045 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:07:09,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:09,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:09,045 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:09,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 19:07:09,113 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:07:09,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:07:09,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 19:07:09,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:09,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:07:09,345 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-25 19:07:09,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 3 case distinctions, treesize of input 61 treesize of output 75 [2021-11-25 19:07:09,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 15 treesize of output 9 [2021-11-25 19:07:09,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 13 [2021-11-25 19:07:09,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 16 [2021-11-25 19:07:09,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 44 treesize of output 44 [2021-11-25 19:07:09,474 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:07:09,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 44 treesize of output 48 [2021-11-25 19:07:09,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 9 treesize of output 3 [2021-11-25 19:07:09,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 7 [2021-11-25 19:07:09,880 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 1 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:09,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:07:23,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 38 treesize of output 36 [2021-11-25 19:07:23,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 792 treesize of output 784 [2021-11-25 19:07:24,118 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:24,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602389068] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:07:24,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [834304984] [2021-11-25 19:07:24,120 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:07:24,120 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:07:24,120 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:07:24,120 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:07:24,120 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:07:24,178 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 19:07:24,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 44 [2021-11-25 19:07:24,223 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:07:24,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:07:24,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 188 [2021-11-25 19:07:24,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 103 treesize of output 54 [2021-11-25 19:07:24,304 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:07:24,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,489 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-25 19:07:24,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 case distinctions, treesize of input 387 treesize of output 443 [2021-11-25 19:07:24,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,616 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-25 19:07:24,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 447 treesize of output 381 [2021-11-25 19:07:24,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,792 INFO L354 Elim1Store]: treesize reduction 118, result has 0.8 percent of original size [2021-11-25 19:07:24,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 31 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 24 case distinctions, treesize of input 458 treesize of output 343 [2021-11-25 19:07:24,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:07:24,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:24,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 36 [2021-11-25 19:07:25,029 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:07:25,693 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3028#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:07:25,693 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:07:25,694 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:07:25,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 43 [2021-11-25 19:07:25,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959094087] [2021-11-25 19:07:25,694 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:07:25,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 19:07:25,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:25,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 19:07:25,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=2177, Unknown=13, NotChecked=0, Total=2352 [2021-11-25 19:07:25,695 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 43 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) [2021-11-25 19:07:26,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:26,892 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-11-25 19:07:26,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 19:07:26,893 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 43 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 25 [2021-11-25 19:07:26,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:26,893 INFO L225 Difference]: With dead ends: 37 [2021-11-25 19:07:26,894 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 19:07:26,895 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=313, Invalid=3580, Unknown=13, NotChecked=0, Total=3906 [2021-11-25 19:07:26,896 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 31 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 503 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:26,896 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 152 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 503 Invalid, 0 Unknown, 43 Unchecked, 0.3s Time] [2021-11-25 19:07:26,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 19:07:26,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2021-11-25 19:07:26,903 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) [2021-11-25 19:07:26,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-11-25 19:07:26,904 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 25 [2021-11-25 19:07:26,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:26,904 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-11-25 19:07:26,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 43 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) [2021-11-25 19:07:26,905 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-11-25 19:07:26,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 19:07:26,905 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:26,906 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 1, 1, 1, 1, 1] [2021-11-25 19:07:26,929 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-25 19:07:27,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 19:07:27,109 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:27,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:27,109 INFO L85 PathProgramCache]: Analyzing trace with hash -303390375, now seen corresponding path program 13 times [2021-11-25 19:07:27,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:27,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583379182] [2021-11-25 19:07:27,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:27,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:27,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:27,480 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:27,480 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:27,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583379182] [2021-11-25 19:07:27,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583379182] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:07:27,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427102572] [2021-11-25 19:07:27,481 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:07:27,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:27,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:27,485 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:27,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 19:07:27,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:27,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 19:07:27,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:27,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:07:27,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 16 [2021-11-25 19:07:27,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 44 treesize of output 44 [2021-11-25 19:07:27,866 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:07:27,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 44 treesize of output 48 [2021-11-25 19:07:27,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 9 treesize of output 3 [2021-11-25 19:07:28,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 7 [2021-11-25 19:07:28,258 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:28,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:07:28,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 21 [2021-11-25 19:07:28,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 186 treesize of output 178 [2021-11-25 19:07:28,855 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:28,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1427102572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:07:28,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [271854341] [2021-11-25 19:07:28,856 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:07:28,857 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:07:28,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:07:28,857 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:07:28,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:07:28,916 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:07:28,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:07:28,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:07:28,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:28,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 188 [2021-11-25 19:07:28,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 96 treesize of output 51 [2021-11-25 19:07:28,995 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:07:29,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,161 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-25 19:07:29,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 case distinctions, treesize of input 387 treesize of output 443 [2021-11-25 19:07:29,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 157 treesize of output 87 [2021-11-25 19:07:29,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 169 treesize of output 90 [2021-11-25 19:07:29,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 84 [2021-11-25 19:07:29,487 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:07:29,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:07:29,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:29,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 36 [2021-11-25 19:07:29,720 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:07:30,482 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3370#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:07:30,482 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:07:30,483 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:07:30,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 46 [2021-11-25 19:07:30,483 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788320130] [2021-11-25 19:07:30,483 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:07:30,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 19:07:30,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:30,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 19:07:30,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=2478, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 19:07:30,484 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 46 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:31,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:31,729 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-11-25 19:07:31,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 19:07:31,729 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 46 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-25 19:07:31,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:31,730 INFO L225 Difference]: With dead ends: 55 [2021-11-25 19:07:31,730 INFO L226 Difference]: Without dead ends: 53 [2021-11-25 19:07:31,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 48 SyntacticMatches, 5 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 917 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=363, Invalid=4329, Unknown=0, NotChecked=0, Total=4692 [2021-11-25 19:07:31,732 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 28 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:31,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 228 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 575 Invalid, 0 Unknown, 18 Unchecked, 0.4s Time] [2021-11-25 19:07:31,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-25 19:07:31,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 33. [2021-11-25 19:07:31,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.09375) internal successors, (35), 32 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) [2021-11-25 19:07:31,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-11-25 19:07:31,741 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 28 [2021-11-25 19:07:31,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:31,741 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-11-25 19:07:31,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 46 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:31,741 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-11-25 19:07:31,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 19:07:31,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:31,742 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 5, 5, 1, 1, 1, 1, 1] [2021-11-25 19:07:31,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 19:07:31,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 19:07:31,943 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:31,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:31,943 INFO L85 PathProgramCache]: Analyzing trace with hash -294935293, now seen corresponding path program 14 times [2021-11-25 19:07:31,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:31,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2897423] [2021-11-25 19:07:31,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:31,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:31,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:32,285 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:32,285 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:32,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2897423] [2021-11-25 19:07:32,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2897423] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:07:32,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267183602] [2021-11-25 19:07:32,285 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:07:32,286 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:32,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:32,286 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:32,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 19:07:32,503 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 19:07:32,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:07:32,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 19:07:32,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:32,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:07:32,834 INFO L354 Elim1Store]: treesize reduction 153, result has 21.5 percent of original size [2021-11-25 19:07:32,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 3 case distinctions, treesize of input 60 treesize of output 84 [2021-11-25 19:07:32,859 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 19:07:32,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 40 treesize of output 23 [2021-11-25 19:07:32,894 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 19:07:32,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 51 treesize of output 26 [2021-11-25 19:07:33,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2021-11-25 19:07:33,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 89 treesize of output 85 [2021-11-25 19:07:33,140 INFO L354 Elim1Store]: treesize reduction 86, result has 28.3 percent of original size [2021-11-25 19:07:33,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 85 treesize of output 97 [2021-11-25 19:07:33,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:33,188 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-25 19:07:33,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 10 [2021-11-25 19:07:34,420 INFO L354 Elim1Store]: treesize reduction 100, result has 2.9 percent of original size [2021-11-25 19:07:34,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 47 treesize of output 16 [2021-11-25 19:07:34,476 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 35 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:34,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:07:37,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 41 treesize of output 39 [2021-11-25 19:07:37,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 15372 treesize of output 15180 [2021-11-25 19:07:41,369 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 30 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:41,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267183602] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:07:41,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [686464945] [2021-11-25 19:07:41,371 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:07:41,371 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:07:41,371 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:07:41,372 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:07:41,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:07:41,439 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 19:07:41,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:07:41,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 24 treesize of output 32 [2021-11-25 19:07:41,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 188 [2021-11-25 19:07:41,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 103 treesize of output 54 [2021-11-25 19:07:41,559 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:07:41,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,768 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-25 19:07:41,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 case distinctions, treesize of input 387 treesize of output 443 [2021-11-25 19:07:41,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 157 treesize of output 87 [2021-11-25 19:07:41,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 20 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 157 treesize of output 87 [2021-11-25 19:07:41,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:41,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 22 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 166 treesize of output 87 [2021-11-25 19:07:42,018 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:07:42,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:07:42,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:42,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-25 19:07:42,208 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:07:42,896 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3757#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= |ULTIMATE.start_main_~val1~0#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:07:42,897 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:07:42,897 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:07:42,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 49 [2021-11-25 19:07:42,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605868109] [2021-11-25 19:07:42,897 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:07:42,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-25 19:07:42,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:42,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-25 19:07:42,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=2634, Unknown=2, NotChecked=0, Total=2970 [2021-11-25 19:07:42,899 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 49 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:45,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:45,228 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2021-11-25 19:07:45,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-25 19:07:45,229 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 49 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-25 19:07:45,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:45,229 INFO L225 Difference]: With dead ends: 88 [2021-11-25 19:07:45,229 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 19:07:45,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1322 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=695, Invalid=5945, Unknown=2, NotChecked=0, Total=6642 [2021-11-25 19:07:45,232 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 12 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 76 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:45,232 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 154 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 63 Invalid, 0 Unknown, 76 Unchecked, 0.0s Time] [2021-11-25 19:07:45,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 19:07:45,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-25 19:07:45,240 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) [2021-11-25 19:07:45,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-11-25 19:07:45,241 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 29 [2021-11-25 19:07:45,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:45,241 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-11-25 19:07:45,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 49 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:07:45,242 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-11-25 19:07:45,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 19:07:45,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:45,242 INFO L514 BasicCegarLoop]: trace histogram [10, 6, 5, 5, 1, 1, 1, 1, 1] [2021-11-25 19:07:45,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 19:07:45,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:45,455 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:45,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:45,455 INFO L85 PathProgramCache]: Analyzing trace with hash -497428541, now seen corresponding path program 15 times [2021-11-25 19:07:45,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:45,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173010127] [2021-11-25 19:07:45,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:45,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:45,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:45,902 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 1 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:45,902 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:45,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173010127] [2021-11-25 19:07:45,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1173010127] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:07:45,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970931156] [2021-11-25 19:07:45,903 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:07:45,903 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:45,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:45,929 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:45,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2f5fce-3559-4491-abe5-543a18104c51/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 19:07:46,035 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:07:46,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:07:46,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-25 19:07:46,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:46,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:07:46,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:46,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-25 19:07:46,318 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:07:46,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:07:46,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:46,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-25 19:07:46,407 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:07:46,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:07:46,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:07:46,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-25 19:07:46,535 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:07:46,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:07:46,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 13 [2021-11-25 19:07:46,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-25 19:07:46,636 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:07:46,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 30 [2021-11-25 19:07:47,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 7 [2021-11-25 19:07:47,061 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 6 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:07:47,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:08:07,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 68 treesize of output 66 [2021-11-25 19:08:07,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 13901814 treesize of output 13893622 [2021-11-25 19:08:49,099 WARN L227 SmtUtils]: Spent 41.89s on a formula simplification that was a NOOP. DAG size: 2999 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:11:53,282 WARN L227 SmtUtils]: Spent 1.72m on a formula simplification. DAG size of input: 1995 DAG size of output: 1995 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:13:32,049 WARN L227 SmtUtils]: Spent 56.68s on a formula simplification. DAG size of input: 1984 DAG size of output: 1984 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:14:21,431 WARN L227 SmtUtils]: Spent 16.51s on a formula simplification. DAG size of input: 1223 DAG size of output: 1223 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:14:50,597 WARN L227 SmtUtils]: Spent 17.52s on a formula simplification. DAG size of input: 1215 DAG size of output: 1214 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:15:09,477 WARN L227 SmtUtils]: Spent 13.57s on a formula simplification. DAG size of input: 1213 DAG size of output: 1213 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:15:33,130 WARN L227 SmtUtils]: Spent 16.66s on a formula simplification. DAG size of input: 1135 DAG size of output: 1134 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:15:50,973 WARN L227 SmtUtils]: Spent 13.54s on a formula simplification. DAG size of input: 1133 DAG size of output: 1133 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:16:05,977 WARN L227 SmtUtils]: Spent 10.54s on a formula simplification. DAG size of input: 1133 DAG size of output: 1133 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:16:28,880 WARN L227 SmtUtils]: Spent 16.70s on a formula simplification. DAG size of input: 1133 DAG size of output: 1133 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:16:47,207 WARN L227 SmtUtils]: Spent 10.18s on a formula simplification. DAG size of input: 1133 DAG size of output: 1133 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:17:10,552 WARN L227 SmtUtils]: Spent 17.31s on a formula simplification. DAG size of input: 1133 DAG size of output: 1133 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)