./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-patterns/array27_pattern.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_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/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_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-patterns/array27_pattern.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/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_73ef4184-795e-4d00-87b6-3e73ca5cad0e/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 8e2a4cc1bd1815c470836bbbcc9d3775eac69b651b7231d974ae63a065851dd1 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:52:07,427 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:52:07,430 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:52:07,488 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:52:07,489 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:52:07,493 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:52:07,495 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:52:07,499 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:52:07,502 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:52:07,510 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:52:07,511 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:52:07,514 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:52:07,514 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:52:07,517 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:52:07,520 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:52:07,525 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:52:07,527 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:52:07,528 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:52:07,530 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:52:07,538 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:52:07,540 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:52:07,542 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:52:07,545 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:52:07,547 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:52:07,556 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:52:07,557 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:52:07,557 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:52:07,559 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:52:07,560 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:52:07,561 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:52:07,562 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:52:07,563 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:52:07,564 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:52:07,566 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:52:07,569 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:52:07,570 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:52:07,571 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:52:07,571 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:52:07,572 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:52:07,573 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:52:07,573 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:52:07,574 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:52:07,602 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:52:07,602 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:52:07,603 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:52:07,603 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:52:07,604 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:52:07,604 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:52:07,604 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:52:07,604 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:52:07,605 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:52:07,605 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:52:07,605 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:52:07,605 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:52:07,605 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:52:07,606 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:52:07,606 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:52:07,606 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:52:07,606 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:52:07,607 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:52:07,607 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:52:07,608 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:52:07,608 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:52:07,608 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:52:07,608 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:52:07,609 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:52:07,609 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:52:07,609 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:52:07,609 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:52:07,610 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:52:07,610 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:52:07,610 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:52:07,610 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:52:07,611 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:52:07,611 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:52:07,611 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:52:07,611 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:52:07,612 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:52:07,612 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:52:07,612 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:52:07,612 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:52:07,612 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:52:07,613 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:52:07,613 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_73ef4184-795e-4d00-87b6-3e73ca5cad0e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8e2a4cc1bd1815c470836bbbcc9d3775eac69b651b7231d974ae63a065851dd1 [2021-11-25 19:52:07,895 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:52:07,934 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:52:07,936 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:52:07,938 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:52:07,939 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:52:07,940 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-patterns/array27_pattern.c [2021-11-25 19:52:08,068 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/data/b48e75613/e36e789835f3456aa98f05de4e4e041a/FLAG2f756708e [2021-11-25 19:52:08,577 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:52:08,577 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/sv-benchmarks/c/array-patterns/array27_pattern.c [2021-11-25 19:52:08,584 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/data/b48e75613/e36e789835f3456aa98f05de4e4e041a/FLAG2f756708e [2021-11-25 19:52:08,962 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/data/b48e75613/e36e789835f3456aa98f05de4e4e041a [2021-11-25 19:52:08,964 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:52:08,966 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:52:08,967 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:52:08,968 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:52:08,973 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:52:08,973 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:52:08" (1/1) ... [2021-11-25 19:52:08,975 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@406411ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:08, skipping insertion in model container [2021-11-25 19:52:08,975 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:52:08" (1/1) ... [2021-11-25 19:52:08,990 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:52:09,010 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:52:09,169 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_73ef4184-795e-4d00-87b6-3e73ca5cad0e/sv-benchmarks/c/array-patterns/array27_pattern.c[1253,1266] [2021-11-25 19:52:09,217 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:52:09,225 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:52:09,237 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_73ef4184-795e-4d00-87b6-3e73ca5cad0e/sv-benchmarks/c/array-patterns/array27_pattern.c[1253,1266] [2021-11-25 19:52:09,247 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:52:09,261 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:52:09,262 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09 WrapperNode [2021-11-25 19:52:09,262 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:52:09,263 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:52:09,263 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:52:09,264 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:52:09,271 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (1/1) ... [2021-11-25 19:52:09,277 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (1/1) ... [2021-11-25 19:52:09,299 INFO L137 Inliner]: procedures = 16, calls = 15, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 72 [2021-11-25 19:52:09,300 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:52:09,301 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:52:09,301 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:52:09,301 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:52:09,310 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (1/1) ... [2021-11-25 19:52:09,311 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (1/1) ... [2021-11-25 19:52:09,313 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (1/1) ... [2021-11-25 19:52:09,313 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (1/1) ... [2021-11-25 19:52:09,320 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (1/1) ... [2021-11-25 19:52:09,325 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (1/1) ... [2021-11-25 19:52:09,326 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (1/1) ... [2021-11-25 19:52:09,329 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:52:09,330 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:52:09,331 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:52:09,331 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:52:09,344 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (1/1) ... [2021-11-25 19:52:09,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:52:09,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:09,379 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:52:09,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:52:09,423 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:52:09,424 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:52:09,424 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 19:52:09,424 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 19:52:09,424 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:52:09,425 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:52:09,425 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 19:52:09,425 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 19:52:09,506 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:52:09,507 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:52:09,657 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:52:09,713 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:52:09,714 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-25 19:52:09,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:52:09 BoogieIcfgContainer [2021-11-25 19:52:09,716 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:52:09,718 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:52:09,719 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:52:09,722 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:52:09,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:52:08" (1/3) ... [2021-11-25 19:52:09,724 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c8cea41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:52:09, skipping insertion in model container [2021-11-25 19:52:09,724 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:52:09" (2/3) ... [2021-11-25 19:52:09,724 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c8cea41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:52:09, skipping insertion in model container [2021-11-25 19:52:09,724 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:52:09" (3/3) ... [2021-11-25 19:52:09,726 INFO L111 eAbstractionObserver]: Analyzing ICFG array27_pattern.c [2021-11-25 19:52:09,732 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:52:09,733 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:52:09,841 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:52:09,848 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 19:52:09,848 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:52:09,867 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.75) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 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 19:52:09,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 19:52:09,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:09,881 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 19:52:09,883 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:09,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:09,893 INFO L85 PathProgramCache]: Analyzing trace with hash 111032306, now seen corresponding path program 1 times [2021-11-25 19:52:09,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:09,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877546598] [2021-11-25 19:52:09,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:09,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:10,038 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:10,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1222538537] [2021-11-25 19:52:10,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:10,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:10,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:10,046 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:10,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:52:10,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:10,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:52:10,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:10,315 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 19:52:10,316 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:10,316 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:10,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877546598] [2021-11-25 19:52:10,317 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:10,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222538537] [2021-11-25 19:52:10,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222538537] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:10,318 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:10,319 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:52:10,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990421276] [2021-11-25 19:52:10,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:10,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:52:10,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:52:10,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:52:10,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:52:10,360 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.75) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 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 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 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 19:52:10,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:10,431 INFO L93 Difference]: Finished difference Result 19 states and 27 transitions. [2021-11-25 19:52:10,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:52:10,435 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-11-25 19:52:10,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:10,445 INFO L225 Difference]: With dead ends: 19 [2021-11-25 19:52:10,445 INFO L226 Difference]: Without dead ends: 10 [2021-11-25 19:52:10,458 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 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 19:52:10,464 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:10,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 7 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:52:10,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-25 19:52:10,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 9. [2021-11-25 19:52:10,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.5) internal successors, (12), 8 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 19:52:10,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 12 transitions. [2021-11-25 19:52:10,509 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 12 transitions. Word has length 5 [2021-11-25 19:52:10,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:10,509 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 12 transitions. [2021-11-25 19:52:10,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 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 19:52:10,510 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 12 transitions. [2021-11-25 19:52:10,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 19:52:10,510 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:10,511 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:10,537 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 19:52:10,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 19:52:10,724 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:10,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:10,725 INFO L85 PathProgramCache]: Analyzing trace with hash 1329661337, now seen corresponding path program 1 times [2021-11-25 19:52:10,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:10,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410187803] [2021-11-25 19:52:10,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:10,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:10,734 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:10,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [180290637] [2021-11-25 19:52:10,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:10,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:10,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:10,736 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:10,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:52:10,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:10,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:52:10,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:10,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:52:10,869 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:10,870 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:10,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410187803] [2021-11-25 19:52:10,871 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:10,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180290637] [2021-11-25 19:52:10,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180290637] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:10,873 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:10,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:52:10,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412475608] [2021-11-25 19:52:10,875 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:10,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:52:10,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:52:10,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:52:10,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:52:10,880 INFO L87 Difference]: Start difference. First operand 9 states and 12 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 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 19:52:10,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:10,942 INFO L93 Difference]: Finished difference Result 18 states and 26 transitions. [2021-11-25 19:52:10,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:52:10,943 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 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 19:52:10,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:10,944 INFO L225 Difference]: With dead ends: 18 [2021-11-25 19:52:10,944 INFO L226 Difference]: Without dead ends: 11 [2021-11-25 19:52:10,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:52:10,948 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 7 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:10,949 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 4 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:52:10,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-25 19:52:10,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-25 19:52:10,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.4) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 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 19:52:10,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2021-11-25 19:52:10,953 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 7 [2021-11-25 19:52:10,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:10,954 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2021-11-25 19:52:10,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 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 19:52:10,954 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2021-11-25 19:52:10,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:52:10,955 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:10,955 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:10,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:11,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:11,171 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:11,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:11,172 INFO L85 PathProgramCache]: Analyzing trace with hash -1537908078, now seen corresponding path program 1 times [2021-11-25 19:52:11,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:11,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500266400] [2021-11-25 19:52:11,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:11,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:11,180 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:11,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [215473459] [2021-11-25 19:52:11,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:11,181 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:11,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:11,192 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:11,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:52:11,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:11,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:52:11,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:11,339 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:52:11,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:11,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:52:11,380 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:11,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500266400] [2021-11-25 19:52:11,381 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:11,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215473459] [2021-11-25 19:52:11,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [215473459] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:52:11,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1604546454] [2021-11-25 19:52:11,412 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 19:52:11,412 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:52:11,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:52:11,425 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:52:11,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:52:11,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:11,637 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 19:52:11,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 19:52:11,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:11,667 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 52 treesize of output 60 [2021-11-25 19:52:11,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:11,781 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:11,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 96 treesize of output 115 [2021-11-25 19:52:11,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:11,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 14 [2021-11-25 19:52:11,926 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:12,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:12,146 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:12,150 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:12,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:12,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:12,221 INFO L354 Elim1Store]: treesize reduction 250, result has 15.3 percent of original size [2021-11-25 19:52:12,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 406 treesize of output 449 [2021-11-25 19:52:12,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:12,316 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:12,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 109 treesize of output 48 [2021-11-25 19:52:12,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:12,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:12,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 124 treesize of output 54 [2021-11-25 19:52:12,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:12,600 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 33 treesize of output 29 [2021-11-25 19:52:12,701 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 33 treesize of output 29 [2021-11-25 19:52:12,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:12,784 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 33 treesize of output 29 [2021-11-25 19:52:12,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:12,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:12,929 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 33 treesize of output 29 [2021-11-25 19:52:12,970 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 33 treesize of output 29 [2021-11-25 19:52:12,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:12,995 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:52:13,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '190#(and (<= ~ARR_SIZE~0 |ULTIMATE.start_main_~row~0#1|) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_main_~sum~0#1| 0) (<= 0 |ULTIMATE.start_main_~#array~0#1.offset|) (<= 0 |ULTIMATE.start_main_~column~0#1|) (<= 0 |ULTIMATE.start_main_~sum~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ ~ARR_SIZE~0 32768)) (= (ite (= (+ (* 2 |ULTIMATE.start_main_~sum~0#1|) (* 2 (* ~ARR_SIZE~0 ~ARR_SIZE~0))) (+ (* ~ARR_SIZE~0 ~ARR_SIZE~0 ~ARR_SIZE~0) ~ARR_SIZE~0)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (<= |#NULL.base| 0) (= |ULTIMATE.start_main_~row~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= |ULTIMATE.start_main_~#array~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1))' at error location [2021-11-25 19:52:13,599 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:52:13,599 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:52:13,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-11-25 19:52:13,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335045586] [2021-11-25 19:52:13,600 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:52:13,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:52:13,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:52:13,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:52:13,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:52:13,602 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 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 19:52:13,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:13,674 INFO L93 Difference]: Finished difference Result 19 states and 24 transitions. [2021-11-25 19:52:13,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:52:13,674 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 19:52:13,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:13,675 INFO L225 Difference]: With dead ends: 19 [2021-11-25 19:52:13,675 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 19:52:13,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:52:13,677 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 26 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:13,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 4 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:52:13,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 19:52:13,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 12. [2021-11-25 19:52:13,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:52:13,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2021-11-25 19:52:13,683 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2021-11-25 19:52:13,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:13,683 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2021-11-25 19:52:13,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 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 19:52:13,684 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2021-11-25 19:52:13,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:52:13,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:13,684 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:13,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:13,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:13,904 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:13,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:13,905 INFO L85 PathProgramCache]: Analyzing trace with hash 1643618289, now seen corresponding path program 1 times [2021-11-25 19:52:13,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:13,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695468395] [2021-11-25 19:52:13,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:13,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:13,911 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:13,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1610693555] [2021-11-25 19:52:13,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:13,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:13,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:13,913 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:13,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:52:13,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:13,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 19:52:13,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:14,039 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 36 treesize of output 31 [2021-11-25 19:52:14,044 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:52:14,054 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:52:14,193 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 35 treesize of output 23 [2021-11-25 19:52:14,264 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:52:14,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:18,475 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:52:18,475 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 4 case distinctions, treesize of input 80 treesize of output 82 [2021-11-25 19:52:18,500 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:52:18,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 55 treesize of output 62 [2021-11-25 19:52:18,546 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 19 treesize of output 4 [2021-11-25 19:52:18,624 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 17 treesize of output 4 [2021-11-25 19:52:18,656 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 19 [2021-11-25 19:52:19,137 INFO L354 Elim1Store]: treesize reduction 38, result has 47.9 percent of original size [2021-11-25 19:52:19,137 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 81 treesize of output 79 [2021-11-25 19:52:19,453 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:52:19,453 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:19,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695468395] [2021-11-25 19:52:19,453 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:19,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610693555] [2021-11-25 19:52:19,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610693555] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:52:19,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1193811758] [2021-11-25 19:52:19,456 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:52:19,457 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:52:19,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:52:19,457 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:52:19,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:52:19,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:19,514 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 19:52:19,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 19:52:19,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:19,532 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 52 treesize of output 60 [2021-11-25 19:52:19,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:19,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 50 [2021-11-25 19:52:19,681 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:19,686 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:19,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:19,937 INFO L354 Elim1Store]: treesize reduction 212, result has 20.3 percent of original size [2021-11-25 19:52:19,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 403 treesize of output 426 [2021-11-25 19:52:20,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:20,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 18 [2021-11-25 19:52:20,150 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:20,186 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:20,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:20,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 24 [2021-11-25 19:52:20,344 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:20,384 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:20,420 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:20,560 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 33 treesize of output 29 [2021-11-25 19:52:20,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:20,653 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 33 treesize of output 29 [2021-11-25 19:52:20,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:20,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:20,712 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 33 treesize of output 29 [2021-11-25 19:52:20,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:21,007 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 33 treesize of output 29 [2021-11-25 19:52:21,044 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 33 treesize of output 29 [2021-11-25 19:52:21,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:21,069 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:52:21,813 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '329#(and (<= ~ARR_SIZE~0 |ULTIMATE.start_main_~row~0#1|) (<= 0 |ULTIMATE.start_main_~column~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ ~ARR_SIZE~0 32768)) (= (ite (= (+ (* 2 |ULTIMATE.start_main_~sum~0#1|) (* 2 (* ~ARR_SIZE~0 ~ARR_SIZE~0))) (+ (* ~ARR_SIZE~0 ~ARR_SIZE~0 ~ARR_SIZE~0) ~ARR_SIZE~0)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~row~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= ~ARR_SIZE~0 32767) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 19:52:21,814 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:52:21,814 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:52:21,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-11-25 19:52:21,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224511867] [2021-11-25 19:52:21,814 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:52:21,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 19:52:21,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:52:21,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 19:52:21,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=419, Unknown=1, NotChecked=0, Total=506 [2021-11-25 19:52:21,817 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 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 19:52:22,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:22,488 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2021-11-25 19:52:22,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 19:52:22,488 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 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) Word has length 11 [2021-11-25 19:52:22,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:22,490 INFO L225 Difference]: With dead ends: 38 [2021-11-25 19:52:22,490 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 19:52:22,491 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=130, Invalid=571, Unknown=1, NotChecked=0, Total=702 [2021-11-25 19:52:22,492 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 32 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:22,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 21 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 129 Invalid, 0 Unknown, 21 Unchecked, 0.6s Time] [2021-11-25 19:52:22,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 19:52:22,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 18. [2021-11-25 19:52:22,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 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 19:52:22,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 24 transitions. [2021-11-25 19:52:22,500 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 24 transitions. Word has length 11 [2021-11-25 19:52:22,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:22,500 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 24 transitions. [2021-11-25 19:52:22,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 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 19:52:22,500 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 24 transitions. [2021-11-25 19:52:22,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 19:52:22,502 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:22,502 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:22,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:22,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:22,716 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:22,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:22,716 INFO L85 PathProgramCache]: Analyzing trace with hash -595789752, now seen corresponding path program 2 times [2021-11-25 19:52:22,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:22,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620143357] [2021-11-25 19:52:22,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:22,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:22,723 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:22,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1221500666] [2021-11-25 19:52:22,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:52:22,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:22,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:22,738 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:22,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:52:22,804 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 19:52:22,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:52:22,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:52:22,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:22,874 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:52:22,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:22,921 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:52:22,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:22,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620143357] [2021-11-25 19:52:22,921 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:22,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221500666] [2021-11-25 19:52:22,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221500666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:52:22,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [902853802] [2021-11-25 19:52:22,925 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:52:22,925 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:52:22,925 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:52:22,925 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:52:22,926 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:52:22,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:22,972 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 19:52:22,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 19:52:22,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:22,987 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 52 treesize of output 60 [2021-11-25 19:52:23,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:23,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 50 [2021-11-25 19:52:23,113 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:23,116 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:23,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:23,360 INFO L354 Elim1Store]: treesize reduction 212, result has 20.3 percent of original size [2021-11-25 19:52:23,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 403 treesize of output 426 [2021-11-25 19:52:23,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:23,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 18 [2021-11-25 19:52:23,510 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:23,512 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:23,519 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:52:23,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 676 treesize of output 583 [2021-11-25 19:52:23,836 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 33 treesize of output 29 [2021-11-25 19:52:23,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:23,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:23,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:24,051 INFO L354 Elim1Store]: treesize reduction 130, result has 10.3 percent of original size [2021-11-25 19:52:24,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 229 treesize of output 247 [2021-11-25 19:52:24,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:24,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 21 [2021-11-25 19:52:24,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:24,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:24,173 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:52:24,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 52 treesize of output 18 [2021-11-25 19:52:24,231 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 33 treesize of output 29 [2021-11-25 19:52:24,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:24,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:24,286 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 33 treesize of output 29 [2021-11-25 19:52:24,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:24,336 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 33 treesize of output 29 [2021-11-25 19:52:24,366 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 33 treesize of output 29 [2021-11-25 19:52:24,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:24,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:24,646 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 33 treesize of output 29 [2021-11-25 19:52:24,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:24,681 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 33 treesize of output 29 [2021-11-25 19:52:24,686 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:52:24,954 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '517#(and (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= (* (* ~ARR_SIZE~0 (+ (- 1) ~ARR_SIZE~0)) (+ (- 1) ~ARR_SIZE~0)) (* |ULTIMATE.start_main_~sum~0#1| 2)) 1 0)) (<= ~ARR_SIZE~0 |ULTIMATE.start_main_~row~0#1|) (<= 0 |ULTIMATE.start_main_~column~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ ~ARR_SIZE~0 32768)) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~row~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= ~ARR_SIZE~0 32767) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 19:52:24,954 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:52:24,954 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:52:24,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-11-25 19:52:24,954 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752463219] [2021-11-25 19:52:24,954 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:52:24,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:52:24,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:52:24,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:52:24,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:52:24,956 INFO L87 Difference]: Start difference. First operand 18 states and 24 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:52:25,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:25,120 INFO L93 Difference]: Finished difference Result 53 states and 70 transitions. [2021-11-25 19:52:25,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:52:25,120 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-25 19:52:25,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:25,121 INFO L225 Difference]: With dead ends: 53 [2021-11-25 19:52:25,121 INFO L226 Difference]: Without dead ends: 47 [2021-11-25 19:52:25,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:52:25,123 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 33 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:25,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 10 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:52:25,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-25 19:52:25,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 30. [2021-11-25 19:52:25,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:52:25,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2021-11-25 19:52:25,134 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 12 [2021-11-25 19:52:25,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:25,135 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2021-11-25 19:52:25,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:52:25,135 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2021-11-25 19:52:25,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 19:52:25,136 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:25,137 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:25,175 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-25 19:52:25,350 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:25,350 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:25,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:25,351 INFO L85 PathProgramCache]: Analyzing trace with hash 724752490, now seen corresponding path program 3 times [2021-11-25 19:52:25,351 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:25,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918201846] [2021-11-25 19:52:25,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:25,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:25,359 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:25,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1567518392] [2021-11-25 19:52:25,365 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:52:25,365 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:25,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:25,366 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:25,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:52:25,420 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:52:25,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:52:25,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:52:25,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:25,482 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:52:25,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:25,543 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:52:25,543 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:25,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918201846] [2021-11-25 19:52:25,543 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:25,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567518392] [2021-11-25 19:52:25,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567518392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:52:25,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767358051] [2021-11-25 19:52:25,547 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:52:25,548 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:52:25,548 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:52:25,548 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:52:25,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:52:25,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:25,615 INFO L354 Elim1Store]: treesize reduction 80, result has 19.2 percent of original size [2021-11-25 19:52:25,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 52 treesize of output 68 [2021-11-25 19:52:25,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:25,691 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 19:52:25,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 19:52:25,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:25,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 50 [2021-11-25 19:52:25,823 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:25,829 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:25,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:25,982 INFO L354 Elim1Store]: treesize reduction 212, result has 20.3 percent of original size [2021-11-25 19:52:25,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 403 treesize of output 426 [2021-11-25 19:52:26,086 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:26,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:26,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 18 [2021-11-25 19:52:26,188 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:26,292 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:26,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:26,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 24 [2021-11-25 19:52:26,348 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:26,375 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:26,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:26,512 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 33 treesize of output 29 [2021-11-25 19:52:26,613 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 33 treesize of output 29 [2021-11-25 19:52:26,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:26,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:26,659 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 33 treesize of output 29 [2021-11-25 19:52:26,975 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 33 treesize of output 29 [2021-11-25 19:52:26,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-25 19:52:27,028 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 33 treesize of output 29 [2021-11-25 19:52:27,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:27,046 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:52:27,425 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '763#(and (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= (* (* ~ARR_SIZE~0 (+ (- 1) ~ARR_SIZE~0)) (+ (- 1) ~ARR_SIZE~0)) (* |ULTIMATE.start_main_~sum~0#1| 2)) 1 0)) (<= ~ARR_SIZE~0 |ULTIMATE.start_main_~row~0#1|) (<= 0 |ULTIMATE.start_main_~column~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ ~ARR_SIZE~0 32768)) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~row~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= ~ARR_SIZE~0 32767) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 19:52:27,425 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:52:27,426 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:52:27,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-11-25 19:52:27,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485439386] [2021-11-25 19:52:27,426 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:52:27,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 19:52:27,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:52:27,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 19:52:27,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-11-25 19:52:27,428 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 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 19:52:27,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:27,602 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2021-11-25 19:52:27,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 19:52:27,602 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 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) Word has length 12 [2021-11-25 19:52:27,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:27,603 INFO L225 Difference]: With dead ends: 46 [2021-11-25 19:52:27,603 INFO L226 Difference]: Without dead ends: 39 [2021-11-25 19:52:27,604 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:52:27,605 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 8 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:27,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 12 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:52:27,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-25 19:52:27,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2021-11-25 19:52:27,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.375) internal successors, (44), 32 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:52:27,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2021-11-25 19:52:27,617 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 12 [2021-11-25 19:52:27,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:27,617 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2021-11-25 19:52:27,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 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 19:52:27,618 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2021-11-25 19:52:27,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 19:52:27,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:27,619 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:27,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:27,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 19:52:27,832 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:27,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:27,832 INFO L85 PathProgramCache]: Analyzing trace with hash 1157329458, now seen corresponding path program 4 times [2021-11-25 19:52:27,833 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:27,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350240032] [2021-11-25 19:52:27,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:27,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:27,839 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:27,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [442412187] [2021-11-25 19:52:27,840 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:52:27,840 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:27,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:27,841 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:27,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:52:27,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:27,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:52:27,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:27,965 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:52:27,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:28,010 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:52:28,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:28,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350240032] [2021-11-25 19:52:28,011 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:28,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442412187] [2021-11-25 19:52:28,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442412187] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:52:28,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1988144521] [2021-11-25 19:52:28,014 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:52:28,014 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:52:28,014 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:52:28,015 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:52:28,015 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:52:28,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:28,060 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 19:52:28,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 19:52:28,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:28,072 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 52 treesize of output 60 [2021-11-25 19:52:28,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:28,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 50 [2021-11-25 19:52:28,181 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:28,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:28,190 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:28,347 INFO L354 Elim1Store]: treesize reduction 212, result has 20.3 percent of original size [2021-11-25 19:52:28,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 403 treesize of output 426 [2021-11-25 19:52:28,418 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:28,421 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:28,428 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:52:28,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 384 treesize of output 323 [2021-11-25 19:52:28,603 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:28,610 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:52:28,611 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 383 treesize of output 333 [2021-11-25 19:52:28,732 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 33 treesize of output 29 [2021-11-25 19:52:28,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:28,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:28,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:28,913 INFO L354 Elim1Store]: treesize reduction 130, result has 10.3 percent of original size [2021-11-25 19:52:28,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 229 treesize of output 247 [2021-11-25 19:52:28,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:28,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 18 [2021-11-25 19:52:28,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:28,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:28,965 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:52:28,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 52 treesize of output 18 [2021-11-25 19:52:29,042 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 33 treesize of output 29 [2021-11-25 19:52:29,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:29,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:29,111 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 33 treesize of output 29 [2021-11-25 19:52:29,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:29,189 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 33 treesize of output 29 [2021-11-25 19:52:29,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:29,221 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 33 treesize of output 29 [2021-11-25 19:52:29,499 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 33 treesize of output 29 [2021-11-25 19:52:29,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-25 19:52:29,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:29,575 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 33 treesize of output 29 [2021-11-25 19:52:29,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:29,606 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 33 treesize of output 29 [2021-11-25 19:52:29,611 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:52:29,951 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1011#(and (<= ~ARR_SIZE~0 |ULTIMATE.start_main_~row~0#1|) (<= 0 |ULTIMATE.start_main_~column~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ ~ARR_SIZE~0 32768)) (= (ite (= (+ (* 2 |ULTIMATE.start_main_~sum~0#1|) (* 2 (* ~ARR_SIZE~0 ~ARR_SIZE~0))) (+ (* ~ARR_SIZE~0 ~ARR_SIZE~0 ~ARR_SIZE~0) ~ARR_SIZE~0)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~row~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= ~ARR_SIZE~0 32767) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 19:52:29,952 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:52:29,952 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:52:29,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-11-25 19:52:29,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658941277] [2021-11-25 19:52:29,952 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:52:29,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:52:29,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:52:29,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:52:29,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:52:29,954 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 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 19:52:30,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:30,115 INFO L93 Difference]: Finished difference Result 59 states and 78 transitions. [2021-11-25 19:52:30,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 19:52:30,116 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 19:52:30,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:30,117 INFO L225 Difference]: With dead ends: 59 [2021-11-25 19:52:30,117 INFO L226 Difference]: Without dead ends: 42 [2021-11-25 19:52:30,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:52:30,119 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:30,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 13 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:52:30,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-25 19:52:30,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 31. [2021-11-25 19:52:30,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.4) internal successors, (42), 30 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 19:52:30,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 42 transitions. [2021-11-25 19:52:30,129 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 42 transitions. Word has length 14 [2021-11-25 19:52:30,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:30,129 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 42 transitions. [2021-11-25 19:52:30,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 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 19:52:30,130 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 42 transitions. [2021-11-25 19:52:30,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 19:52:30,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:30,131 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:30,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:30,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 19:52:30,344 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:30,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:30,345 INFO L85 PathProgramCache]: Analyzing trace with hash -541820470, now seen corresponding path program 5 times [2021-11-25 19:52:30,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:30,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130333644] [2021-11-25 19:52:30,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:30,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:30,372 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:30,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1285617189] [2021-11-25 19:52:30,372 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:52:30,373 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:30,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:30,390 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:30,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:52:30,517 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 19:52:30,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:52:30,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:52:30,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:30,582 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:52:30,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:30,640 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:52:30,641 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:30,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130333644] [2021-11-25 19:52:30,641 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:30,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285617189] [2021-11-25 19:52:30,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285617189] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:52:30,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1239016587] [2021-11-25 19:52:30,645 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:52:30,645 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:52:30,646 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:52:30,646 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:52:30,646 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:52:30,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:30,708 INFO L354 Elim1Store]: treesize reduction 80, result has 19.2 percent of original size [2021-11-25 19:52:30,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 52 treesize of output 68 [2021-11-25 19:52:30,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:30,819 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 19:52:30,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 19:52:30,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:30,870 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:30,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 96 treesize of output 115 [2021-11-25 19:52:30,886 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:30,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:30,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 24 [2021-11-25 19:52:30,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:30,978 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:30,981 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:30,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:30,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:31,132 INFO L354 Elim1Store]: treesize reduction 250, result has 15.3 percent of original size [2021-11-25 19:52:31,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 406 treesize of output 449 [2021-11-25 19:52:31,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:31,188 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:31,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 139 treesize of output 48 [2021-11-25 19:52:31,223 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:31,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:31,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:31,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 124 treesize of output 54 [2021-11-25 19:52:31,382 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 33 treesize of output 29 [2021-11-25 19:52:31,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:31,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:31,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:31,572 INFO L354 Elim1Store]: treesize reduction 138, result has 9.8 percent of original size [2021-11-25 19:52:31,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 240 treesize of output 258 [2021-11-25 19:52:31,620 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:31,626 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:52:31,626 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 211 treesize of output 172 [2021-11-25 19:52:31,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:31,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:31,699 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:52:31,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 210 treesize of output 172 [2021-11-25 19:52:31,784 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 33 treesize of output 29 [2021-11-25 19:52:31,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:31,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-25 19:52:31,865 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 33 treesize of output 29 [2021-11-25 19:52:31,902 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 33 treesize of output 29 [2021-11-25 19:52:31,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:32,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:32,128 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 33 treesize of output 29 [2021-11-25 19:52:32,171 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 33 treesize of output 29 [2021-11-25 19:52:32,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:32,189 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:52:32,601 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1285#(and (<= ~ARR_SIZE~0 |ULTIMATE.start_main_~row~0#1|) (<= 0 |ULTIMATE.start_main_~column~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ ~ARR_SIZE~0 32768)) (= (ite (= (+ (* 2 |ULTIMATE.start_main_~sum~0#1|) (* 2 (* ~ARR_SIZE~0 ~ARR_SIZE~0))) (+ (* ~ARR_SIZE~0 ~ARR_SIZE~0 ~ARR_SIZE~0) ~ARR_SIZE~0)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~row~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= ~ARR_SIZE~0 32767) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 19:52:32,602 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:52:32,602 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:52:32,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-11-25 19:52:32,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189096321] [2021-11-25 19:52:32,602 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:52:32,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:52:32,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:52:32,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:52:32,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:52:32,603 INFO L87 Difference]: Start difference. First operand 31 states and 42 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:52:32,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:32,731 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-25 19:52:32,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:52:32,732 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 19:52:32,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:32,733 INFO L225 Difference]: With dead ends: 38 [2021-11-25 19:52:32,733 INFO L226 Difference]: Without dead ends: 24 [2021-11-25 19:52:32,734 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:52:32,734 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 30 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:32,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 8 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:52:32,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-25 19:52:32,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 20. [2021-11-25 19:52:32,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 19 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 19:52:32,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2021-11-25 19:52:32,742 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 15 [2021-11-25 19:52:32,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:32,743 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2021-11-25 19:52:32,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:52:32,743 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2021-11-25 19:52:32,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 19:52:32,744 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:32,744 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-25 19:52:32,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:32,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:32,972 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:32,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:32,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1248500512, now seen corresponding path program 6 times [2021-11-25 19:52:32,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:32,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5873484] [2021-11-25 19:52:32,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:32,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:32,989 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:32,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1265488046] [2021-11-25 19:52:32,990 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:52:32,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:32,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:32,996 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:33,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:52:33,064 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:52:33,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:52:33,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:52:33,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:33,126 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:52:33,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:33,173 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:52:33,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:33,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5873484] [2021-11-25 19:52:33,173 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:33,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265488046] [2021-11-25 19:52:33,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265488046] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:52:33,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2005319706] [2021-11-25 19:52:33,176 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:52:33,177 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:52:33,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:52:33,177 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:52:33,177 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:52:33,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:33,278 INFO L354 Elim1Store]: treesize reduction 80, result has 19.2 percent of original size [2021-11-25 19:52:33,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 52 treesize of output 68 [2021-11-25 19:52:33,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:33,388 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 19:52:33,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 19:52:33,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:33,448 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:33,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 96 treesize of output 115 [2021-11-25 19:52:33,471 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:33,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:33,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 24 [2021-11-25 19:52:33,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:33,566 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:33,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:33,572 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:33,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:33,687 INFO L354 Elim1Store]: treesize reduction 250, result has 15.3 percent of original size [2021-11-25 19:52:33,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 406 treesize of output 449 [2021-11-25 19:52:33,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:33,731 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:33,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:33,739 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:52:33,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 434 treesize of output 337 [2021-11-25 19:52:33,827 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:33,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:33,837 INFO L354 Elim1Store]: treesize reduction 96, result has 1.0 percent of original size [2021-11-25 19:52:33,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 433 treesize of output 364 [2021-11-25 19:52:33,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:33,944 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 33 treesize of output 29 [2021-11-25 19:52:34,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:34,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:34,151 INFO L354 Elim1Store]: treesize reduction 130, result has 10.3 percent of original size [2021-11-25 19:52:34,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 229 treesize of output 247 [2021-11-25 19:52:34,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:34,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 18 [2021-11-25 19:52:34,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:34,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:34,211 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:52:34,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 207 treesize of output 165 [2021-11-25 19:52:34,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:34,279 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 33 treesize of output 29 [2021-11-25 19:52:34,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:34,310 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 33 treesize of output 29 [2021-11-25 19:52:34,354 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 33 treesize of output 29 [2021-11-25 19:52:34,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:34,389 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 33 treesize of output 29 [2021-11-25 19:52:34,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:34,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-25 19:52:34,635 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 33 treesize of output 29 [2021-11-25 19:52:34,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:52:34,694 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 33 treesize of output 29 [2021-11-25 19:52:34,701 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:52:34,994 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1523#(and (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= (* (* ~ARR_SIZE~0 (+ (- 1) ~ARR_SIZE~0)) (+ (- 1) ~ARR_SIZE~0)) (* |ULTIMATE.start_main_~sum~0#1| 2)) 1 0)) (<= ~ARR_SIZE~0 |ULTIMATE.start_main_~row~0#1|) (<= 0 |ULTIMATE.start_main_~column~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ ~ARR_SIZE~0 32768)) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~row~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= ~ARR_SIZE~0 32767) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 19:52:34,994 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:52:34,994 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:52:34,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-11-25 19:52:34,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785218093] [2021-11-25 19:52:34,995 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:52:34,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:52:34,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:52:34,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:52:34,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:52:34,997 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 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 19:52:35,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:35,168 INFO L93 Difference]: Finished difference Result 29 states and 37 transitions. [2021-11-25 19:52:35,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 19:52:35,168 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 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) Word has length 19 [2021-11-25 19:52:35,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:35,169 INFO L225 Difference]: With dead ends: 29 [2021-11-25 19:52:35,169 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 19:52:35,170 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=108, Invalid=354, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:52:35,170 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 13 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:35,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 8 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:52:35,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 19:52:35,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-25 19:52:35,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 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 19:52:35,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-25 19:52:35,177 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 19 [2021-11-25 19:52:35,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:35,177 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-25 19:52:35,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 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 19:52:35,178 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-25 19:52:35,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 19:52:35,178 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:35,178 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-25 19:52:35,222 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-25 19:52:35,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:35,396 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:35,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:35,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1293903980, now seen corresponding path program 7 times [2021-11-25 19:52:35,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:35,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903320834] [2021-11-25 19:52:35,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:35,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:35,407 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:35,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2067646981] [2021-11-25 19:52:35,408 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:52:35,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:35,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:35,409 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:35,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:52:35,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:35,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-25 19:52:35,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:35,795 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 135 treesize of output 131 [2021-11-25 19:52:35,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 4 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 109 treesize of output 117 [2021-11-25 19:52:35,819 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 19 treesize of output 3 [2021-11-25 19:52:35,854 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 18 treesize of output 3 [2021-11-25 19:52:35,882 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 17 treesize of output 3 [2021-11-25 19:52:35,917 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:35,934 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:52:35,940 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 3 [2021-11-25 19:52:35,988 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 74 treesize of output 67 [2021-11-25 19:52:36,013 INFO L354 Elim1Store]: treesize reduction 134, result has 19.8 percent of original size [2021-11-25 19:52:36,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 66 treesize of output 89 [2021-11-25 19:52:36,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:36,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 20 [2021-11-25 19:52:36,161 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 70 treesize of output 61 [2021-11-25 19:52:36,197 INFO L354 Elim1Store]: treesize reduction 150, result has 14.3 percent of original size [2021-11-25 19:52:36,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 60 treesize of output 82 [2021-11-25 19:52:36,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:36,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:36,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:36,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 19 [2021-11-25 19:52:36,320 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 79 treesize of output 68 [2021-11-25 19:52:36,386 INFO L354 Elim1Store]: treesize reduction 256, result has 15.5 percent of original size [2021-11-25 19:52:36,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 67 treesize of output 103 [2021-11-25 19:52:36,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:36,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:36,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:36,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:36,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:36,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:52:36,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 17 [2021-11-25 19:52:37,088 INFO L354 Elim1Store]: treesize reduction 168, result has 0.6 percent of original size [2021-11-25 19:52:37,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 109 treesize of output 36 [2021-11-25 19:52:37,193 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:52:37,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:40,947 INFO L354 Elim1Store]: treesize reduction 85, result has 12.4 percent of original size [2021-11-25 19:52:40,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 52 treesize of output 41 [2021-11-25 19:52:41,269 INFO L354 Elim1Store]: treesize reduction 57, result has 39.4 percent of original size [2021-11-25 19:52:41,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 51 treesize of output 65 [2021-11-25 19:52:44,204 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:44,206 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:44,206 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:44,207 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:44,207 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:44,218 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:52:44,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 1226 treesize of output 1049 [2021-11-25 19:52:45,585 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:45,585 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:45,586 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:52:46,118 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:52:46,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 1128 treesize of output 991 [2021-11-25 19:53:08,377 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:08,378 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:08,478 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:08,479 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:08,481 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:08,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:08,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:08,521 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:08,521 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:08,522 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:08,571 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:53:08,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 682 treesize of output 565 [2021-11-25 19:53:09,691 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:09,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:53:09,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:53:09,695 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:09,696 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:53:09,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:53:09,701 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 25 treesize of output 23 [2021-11-25 19:53:12,200 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:53:12,201 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 4 case distinctions, treesize of input 135 treesize of output 133 [2021-11-25 19:53:12,606 INFO L244 Elim1Store]: Index analysis took 297 ms [2021-11-25 19:53:14,625 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:53:14,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 4 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 111 treesize of output 123 [2021-11-25 19:53:14,660 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 19 treesize of output 4 [2021-11-25 19:53:15,516 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 17 treesize of output 4 [2021-11-25 19:53:16,026 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 19 treesize of output 4 [2021-11-25 19:53:16,493 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 17 treesize of output 4 [2021-11-25 19:53:16,945 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 4 [2021-11-25 19:53:18,152 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 4 [2021-11-25 19:53:19,440 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 4 [2021-11-25 19:53:20,529 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 4 [2021-11-25 19:53:21,293 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 656 treesize of output 632 [2021-11-25 19:55:34,116 WARN L227 SmtUtils]: Spent 2.21m on a formula simplification. DAG size of input: 215 DAG size of output: 155 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 19:55:34,118 INFO L354 Elim1Store]: treesize reduction 465, result has 55.9 percent of original size [2021-11-25 19:55:34,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 80931106 treesize of output 77738806 [2021-11-25 19:58:18,044 WARN L227 SmtUtils]: Spent 2.73m on a formula simplification that was a NOOP. DAG size: 4348 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:58:18,350 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:58:18,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903320834] [2021-11-25 19:58:18,350 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:58:18,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067646981] [2021-11-25 19:58:18,351 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-25 19:58:18,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318836155] [2021-11-25 19:58:18,353 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:58:18,354 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:58:18,354 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:58:18,354 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:58:18,354 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:58:18,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:58:18,434 INFO L354 Elim1Store]: treesize reduction 80, result has 19.2 percent of original size [2021-11-25 19:58:18,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 52 treesize of output 68 [2021-11-25 19:58:18,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:58:18,553 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 19:58:18,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 19:58:18,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:58:18,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 50 [2021-11-25 19:58:18,673 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:58:18,676 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:58:18,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:58:18,915 INFO L354 Elim1Store]: treesize reduction 212, result has 20.3 percent of original size [2021-11-25 19:58:18,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 403 treesize of output 426 [2021-11-25 19:58:18,973 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:58:18,975 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:58:18,980 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:58:18,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 384 treesize of output 323 [2021-11-25 19:58:19,153 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:58:19,158 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:58:19,159 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 383 treesize of output 333 [2021-11-25 19:58:19,256 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 33 treesize of output 29 [2021-11-25 19:58:19,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:58:19,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:58:19,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:58:19,397 INFO L354 Elim1Store]: treesize reduction 130, result has 10.3 percent of original size [2021-11-25 19:58:19,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 229 treesize of output 247 [2021-11-25 19:58:19,433 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:58:19,438 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:58:19,439 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 204 treesize of output 169 [2021-11-25 19:58:19,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:58:19,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:58:19,480 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:58:19,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 52 treesize of output 18 [2021-11-25 19:58:19,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:58:19,540 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 33 treesize of output 29 [2021-11-25 19:58:19,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:58:19,586 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 33 treesize of output 29 [2021-11-25 19:58:19,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-25 19:58:19,641 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 33 treesize of output 29 [2021-11-25 19:58:19,668 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 33 treesize of output 29 [2021-11-25 19:58:19,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:58:19,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-25 19:58:19,860 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 33 treesize of output 29 [2021-11-25 19:58:19,885 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 33 treesize of output 29 [2021-11-25 19:58:19,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-25 19:58:19,899 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:58:21,158 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1782#(and (<= ~ARR_SIZE~0 |ULTIMATE.start_main_~row~0#1|) (<= 0 |ULTIMATE.start_main_~column~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ ~ARR_SIZE~0 32768)) (= (ite (= (+ (* 2 |ULTIMATE.start_main_~sum~0#1|) (* 2 (* ~ARR_SIZE~0 ~ARR_SIZE~0))) (+ (* ~ARR_SIZE~0 ~ARR_SIZE~0 ~ARR_SIZE~0) ~ARR_SIZE~0)) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_main_~#array~0#1.base|) (= |ULTIMATE.start_main_~#array~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~row~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= ~ARR_SIZE~0 32767) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2021-11-25 19:58:21,158 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:58:21,158 INFO L186 FreeRefinementEngine]: Found 0 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:58:21,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-11-25 19:58:21,159 ERROR L172 FreeRefinementEngine]: Strategy SIFA_TAIPAN failed to provide any proof altough trace is infeasible [2021-11-25 19:58:21,159 INFO L628 BasicCegarLoop]: Counterexample might be feasible [2021-11-25 19:58:21,164 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-25 19:58:21,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:21,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 19:58:21,370 INFO L732 BasicCegarLoop]: Path program histogram: [7, 1, 1, 1] [2021-11-25 19:58:21,372 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-25 19:58:21,402 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 07:58:21 BoogieIcfgContainer [2021-11-25 19:58:21,402 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-25 19:58:21,403 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-25 19:58:21,403 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-25 19:58:21,403 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-25 19:58:21,404 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:52:09" (3/4) ... [2021-11-25 19:58:21,407 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-25 19:58:21,407 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-25 19:58:21,408 INFO L158 Benchmark]: Toolchain (without parser) took 372441.81ms. Allocated memory was 92.3MB in the beginning and 314.6MB in the end (delta: 222.3MB). Free memory was 58.5MB in the beginning and 144.7MB in the end (delta: -86.2MB). Peak memory consumption was 135.9MB. Max. memory is 16.1GB. [2021-11-25 19:58:21,408 INFO L158 Benchmark]: CDTParser took 19.57ms. Allocated memory is still 92.3MB. Free memory was 48.5MB in the beginning and 66.0MB in the end (delta: -17.5MB). Peak memory consumption was 7.6MB. Max. memory is 16.1GB. [2021-11-25 19:58:21,408 INFO L158 Benchmark]: CACSL2BoogieTranslator took 294.83ms. Allocated memory was 92.3MB in the beginning and 121.6MB in the end (delta: 29.4MB). Free memory was 58.5MB in the beginning and 97.0MB in the end (delta: -38.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-25 19:58:21,409 INFO L158 Benchmark]: Boogie Procedure Inliner took 37.11ms. Allocated memory is still 121.6MB. Free memory was 97.0MB in the beginning and 95.3MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 19:58:21,409 INFO L158 Benchmark]: Boogie Preprocessor took 28.55ms. Allocated memory is still 121.6MB. Free memory was 95.3MB in the beginning and 94.1MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 19:58:21,409 INFO L158 Benchmark]: RCFGBuilder took 386.23ms. Allocated memory is still 121.6MB. Free memory was 94.1MB in the beginning and 80.8MB in the end (delta: 13.3MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-11-25 19:58:21,410 INFO L158 Benchmark]: TraceAbstraction took 371683.63ms. Allocated memory was 121.6MB in the beginning and 314.6MB in the end (delta: 192.9MB). Free memory was 80.2MB in the beginning and 145.7MB in the end (delta: -65.5MB). Peak memory consumption was 130.5MB. Max. memory is 16.1GB. [2021-11-25 19:58:21,410 INFO L158 Benchmark]: Witness Printer took 4.19ms. Allocated memory is still 314.6MB. Free memory was 145.7MB in the beginning and 144.7MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 19:58:21,412 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 19.57ms. Allocated memory is still 92.3MB. Free memory was 48.5MB in the beginning and 66.0MB in the end (delta: -17.5MB). Peak memory consumption was 7.6MB. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 294.83ms. Allocated memory was 92.3MB in the beginning and 121.6MB in the end (delta: 29.4MB). Free memory was 58.5MB in the beginning and 97.0MB in the end (delta: -38.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 37.11ms. Allocated memory is still 121.6MB. Free memory was 97.0MB in the beginning and 95.3MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 28.55ms. Allocated memory is still 121.6MB. Free memory was 95.3MB in the beginning and 94.1MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 386.23ms. Allocated memory is still 121.6MB. Free memory was 94.1MB in the beginning and 80.8MB in the end (delta: 13.3MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * TraceAbstraction took 371683.63ms. Allocated memory was 121.6MB in the beginning and 314.6MB in the end (delta: 192.9MB). Free memory was 80.2MB in the beginning and 145.7MB in the end (delta: -65.5MB). Peak memory consumption was 130.5MB. Max. memory is 16.1GB. * Witness Printer took 4.19ms. Allocated memory is still 314.6MB. Free memory was 145.7MB in the beginning and 144.7MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 32]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L36] signed long long ARR_SIZE ; [L41] ARR_SIZE = (signed long long)__VERIFIER_nondet_short() [L42] CALL assume_abort_if_not(ARR_SIZE > 0) [L30] COND TRUE !cond [L42] RET assume_abort_if_not(ARR_SIZE > 0) [L44] int array[ARR_SIZE][ARR_SIZE] ; [L46] int row = 0, column = 0 ; [L48] signed long long sum = 0 ; [L50] row=0 [L50] COND TRUE row main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/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 -> 8e2a4cc1bd1815c470836bbbcc9d3775eac69b651b7231d974ae63a065851dd1 [2021-11-25 19:58:24,420 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:58:24,443 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:58:24,446 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:58:24,448 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:58:24,449 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:58:24,450 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-patterns/array27_pattern.c [2021-11-25 19:58:24,520 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/data/c4d7b2ae6/65ac60ad8a3242569f518343fb9c8287/FLAG5dc6ea305 [2021-11-25 19:58:24,953 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:58:24,953 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/sv-benchmarks/c/array-patterns/array27_pattern.c [2021-11-25 19:58:24,966 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/data/c4d7b2ae6/65ac60ad8a3242569f518343fb9c8287/FLAG5dc6ea305 [2021-11-25 19:58:25,362 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/data/c4d7b2ae6/65ac60ad8a3242569f518343fb9c8287 [2021-11-25 19:58:25,365 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:58:25,369 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:58:25,373 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:58:25,374 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:58:25,378 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:58:25,379 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,381 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@10d80449 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25, skipping insertion in model container [2021-11-25 19:58:25,381 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,389 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:58:25,410 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:58:25,570 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_73ef4184-795e-4d00-87b6-3e73ca5cad0e/sv-benchmarks/c/array-patterns/array27_pattern.c[1253,1266] [2021-11-25 19:58:25,595 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:58:25,631 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:58:25,662 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_73ef4184-795e-4d00-87b6-3e73ca5cad0e/sv-benchmarks/c/array-patterns/array27_pattern.c[1253,1266] [2021-11-25 19:58:25,692 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:58:25,710 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:58:25,711 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25 WrapperNode [2021-11-25 19:58:25,711 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:58:25,712 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:58:25,713 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:58:25,713 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:58:25,721 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,741 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,773 INFO L137 Inliner]: procedures = 18, calls = 15, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 71 [2021-11-25 19:58:25,774 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:58:25,775 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:58:25,775 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:58:25,776 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:58:25,785 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,786 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,793 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,793 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,815 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,820 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,828 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,835 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:58:25,837 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:58:25,838 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:58:25,838 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:58:25,839 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (1/1) ... [2021-11-25 19:58:25,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:58:25,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:25,886 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:58:25,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:58:25,944 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:58:25,944 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-25 19:58:25,944 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 19:58:25,945 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-25 19:58:25,945 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:58:25,945 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:58:25,945 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 19:58:25,945 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-25 19:58:26,039 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:58:26,042 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:58:26,773 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:58:26,781 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:58:26,782 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-25 19:58:26,784 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:58:26 BoogieIcfgContainer [2021-11-25 19:58:26,784 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:58:26,788 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:58:26,788 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:58:26,791 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:58:26,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:58:25" (1/3) ... [2021-11-25 19:58:26,793 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56cb30bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:58:26, skipping insertion in model container [2021-11-25 19:58:26,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:58:25" (2/3) ... [2021-11-25 19:58:26,794 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56cb30bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:58:26, skipping insertion in model container [2021-11-25 19:58:26,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:58:26" (3/3) ... [2021-11-25 19:58:26,796 INFO L111 eAbstractionObserver]: Analyzing ICFG array27_pattern.c [2021-11-25 19:58:26,805 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:58:26,805 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:58:26,880 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:58:26,891 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 19:58:26,891 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:58:26,919 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 0 states have call successors, (0), 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 19:58:26,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:58:26,925 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:26,926 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:58:26,927 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:58:26,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:26,934 INFO L85 PathProgramCache]: Analyzing trace with hash -468356531, now seen corresponding path program 1 times [2021-11-25 19:58:26,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:26,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [509528933] [2021-11-25 19:58:26,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:26,950 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:26,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:26,953 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:26,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-25 19:58:27,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:27,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-25 19:58:27,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:27,189 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 19:58:27,189 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:58:27,190 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:58:27,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [509528933] [2021-11-25 19:58:27,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [509528933] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:58:27,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:58:27,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:58:27,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654386768] [2021-11-25 19:58:27,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:58:27,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 19:58:27,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:58:27,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 19:58:27,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:58:27,230 INFO L87 Difference]: Start difference. First operand has 22 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 0 states have call successors, (0), 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 2 states, 2 states have (on average 5.0) internal successors, (10), 2 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 19:58:27,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:27,247 INFO L93 Difference]: Finished difference Result 41 states and 60 transitions. [2021-11-25 19:58:27,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 19:58:27,249 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 19:58:27,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:27,257 INFO L225 Difference]: With dead ends: 41 [2021-11-25 19:58:27,257 INFO L226 Difference]: Without dead ends: 18 [2021-11-25 19:58:27,259 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:58:27,263 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:27,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:58:27,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-25 19:58:27,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-25 19:58:27,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 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 19:58:27,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-11-25 19:58:27,293 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 10 [2021-11-25 19:58:27,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:27,293 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-11-25 19:58:27,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.0) internal successors, (10), 2 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 19:58:27,294 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-11-25 19:58:27,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:58:27,294 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:27,295 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:58:27,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:27,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:58:27,504 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:58:27,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:27,505 INFO L85 PathProgramCache]: Analyzing trace with hash -1936709868, now seen corresponding path program 1 times [2021-11-25 19:58:27,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:27,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2090601874] [2021-11-25 19:58:27,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:27,507 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:27,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:27,508 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:27,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-25 19:58:27,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:27,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:58:27,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:28,023 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 19:58:28,023 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:58:28,024 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:58:28,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2090601874] [2021-11-25 19:58:28,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2090601874] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:58:28,024 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:58:28,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:58:28,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244430066] [2021-11-25 19:58:28,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:58:28,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:58:28,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:58:28,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:58:28,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:58:28,036 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 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 19:58:28,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:28,044 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2021-11-25 19:58:28,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:58:28,045 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 19:58:28,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:28,046 INFO L225 Difference]: With dead ends: 28 [2021-11-25 19:58:28,046 INFO L226 Difference]: Without dead ends: 19 [2021-11-25 19:58:28,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:58:28,049 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:28,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 26 Unchecked, 0.0s Time] [2021-11-25 19:58:28,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-25 19:58:28,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-25 19:58:28,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 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 19:58:28,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-11-25 19:58:28,056 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 10 [2021-11-25 19:58:28,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:28,057 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-11-25 19:58:28,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 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 19:58:28,058 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-11-25 19:58:28,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 19:58:28,059 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:28,059 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:58:28,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:28,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:58:28,274 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:58:28,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:28,274 INFO L85 PathProgramCache]: Analyzing trace with hash 1411380456, now seen corresponding path program 1 times [2021-11-25 19:58:28,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:28,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2111054294] [2021-11-25 19:58:28,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:28,275 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:28,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:28,276 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:28,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-25 19:58:28,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:28,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:58:28,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:28,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:28,904 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:58:28,904 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:58:28,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2111054294] [2021-11-25 19:58:28,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2111054294] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:58:28,905 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:58:28,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:58:28,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510857652] [2021-11-25 19:58:28,906 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:58:28,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:58:28,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:58:28,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:58:28,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:58:28,908 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 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 19:58:28,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:28,916 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2021-11-25 19:58:28,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:58:28,916 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 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 13 [2021-11-25 19:58:28,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:28,917 INFO L225 Difference]: With dead ends: 34 [2021-11-25 19:58:28,917 INFO L226 Difference]: Without dead ends: 20 [2021-11-25 19:58:28,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:58:28,920 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 25 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:28,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 25 Unchecked, 0.0s Time] [2021-11-25 19:58:28,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-25 19:58:28,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-25 19:58:28,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:28,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-25 19:58:28,937 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 13 [2021-11-25 19:58:28,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:28,939 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-25 19:58:28,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 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 19:58:28,939 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-25 19:58:28,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 19:58:28,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:28,941 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:58:28,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:29,164 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:58:29,164 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:58:29,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:29,165 INFO L85 PathProgramCache]: Analyzing trace with hash -1019100115, now seen corresponding path program 1 times [2021-11-25 19:58:29,165 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:29,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2041474373] [2021-11-25 19:58:29,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:29,166 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:29,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:29,168 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:29,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-25 19:58:29,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:29,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:58:29,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:29,987 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:29,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:30,435 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:58:30,436 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:58:30,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2041474373] [2021-11-25 19:58:30,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2041474373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:30,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1519019991] [2021-11-25 19:58:30,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:30,437 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:58:30,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:58:30,444 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:58:30,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-25 19:58:30,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:30,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:58:30,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:31,037 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:31,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:31,265 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:31,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1519019991] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:31,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110257976] [2021-11-25 19:58:31,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:31,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:31,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:31,268 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:58:31,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:58:31,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:31,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:58:31,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:31,752 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:58:31,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:31,834 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:58:31,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110257976] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:58:31,835 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-25 19:58:31,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8, 7, 8, 7, 5] total 18 [2021-11-25 19:58:31,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915130705] [2021-11-25 19:58:31,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:58:31,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:58:31,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:58:31,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:58:31,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=219, Unknown=0, NotChecked=0, Total=306 [2021-11-25 19:58:31,838 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 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 19:58:32,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:32,209 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-11-25 19:58:32,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:58:32,238 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 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) Word has length 16 [2021-11-25 19:58:32,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:32,239 INFO L225 Difference]: With dead ends: 25 [2021-11-25 19:58:32,239 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 19:58:32,240 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=97, Invalid=245, Unknown=0, NotChecked=0, Total=342 [2021-11-25 19:58:32,241 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 37 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:32,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 13 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:58:32,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 19:58:32,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-25 19:58:32,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 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 19:58:32,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-25 19:58:32,248 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 16 [2021-11-25 19:58:32,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:32,249 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-25 19:58:32,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 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 19:58:32,249 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-25 19:58:32,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 19:58:32,250 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:32,251 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:58:32,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:32,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:32,678 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (6)] Ended with exit code 0 [2021-11-25 19:58:32,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 19:58:32,876 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:58:32,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:32,877 INFO L85 PathProgramCache]: Analyzing trace with hash -1758364073, now seen corresponding path program 1 times [2021-11-25 19:58:32,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:32,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [381686112] [2021-11-25 19:58:32,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:32,878 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:32,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:32,881 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:32,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-25 19:58:33,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:33,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:58:33,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:33,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:33,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:33,884 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:58:33,885 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:58:33,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [381686112] [2021-11-25 19:58:33,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [381686112] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:33,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1312205301] [2021-11-25 19:58:33,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:33,886 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:58:33,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:58:33,900 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:58:33,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-25 19:58:34,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:34,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:58:34,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:34,495 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:34,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:34,715 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:34,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1312205301] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:34,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816078999] [2021-11-25 19:58:34,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:34,716 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:34,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:34,724 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:58:34,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:58:34,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:34,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:58:34,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:35,303 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:58:35,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:35,761 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:58:35,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816078999] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:35,761 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:58:35,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8, 7, 6, 8] total 23 [2021-11-25 19:58:35,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137848351] [2021-11-25 19:58:35,762 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:58:35,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 19:58:35,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:58:35,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 19:58:35,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=386, Unknown=0, NotChecked=0, Total=506 [2021-11-25 19:58:35,764 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:36,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:36,827 INFO L93 Difference]: Finished difference Result 54 states and 72 transitions. [2021-11-25 19:58:36,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 19:58:36,847 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-25 19:58:36,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:36,850 INFO L225 Difference]: With dead ends: 54 [2021-11-25 19:58:36,850 INFO L226 Difference]: Without dead ends: 46 [2021-11-25 19:58:36,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=232, Invalid=638, Unknown=0, NotChecked=0, Total=870 [2021-11-25 19:58:36,853 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 70 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:36,854 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 38 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 80 Invalid, 0 Unknown, 103 Unchecked, 0.4s Time] [2021-11-25 19:58:36,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-25 19:58:36,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 22. [2021-11-25 19:58:36,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 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 19:58:36,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-11-25 19:58:36,861 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 19 [2021-11-25 19:58:36,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:36,868 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-11-25 19:58:36,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:36,868 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-11-25 19:58:36,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 19:58:36,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:36,869 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:58:36,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:37,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:37,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:37,472 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:37,473 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:58:37,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:37,474 INFO L85 PathProgramCache]: Analyzing trace with hash -1705469543, now seen corresponding path program 1 times [2021-11-25 19:58:37,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:37,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [912148296] [2021-11-25 19:58:37,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:37,475 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:37,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:37,475 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:37,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-25 19:58:37,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:37,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 19:58:37,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:38,035 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 19:58:38,617 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 8 [2021-11-25 19:58:38,991 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:38,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:59:05,342 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 37 treesize of output 35 [2021-11-25 19:59:05,354 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 72 treesize of output 70 [2021-11-25 19:59:42,629 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:42,629 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:59:42,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [912148296] [2021-11-25 19:59:42,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [912148296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:59:42,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1640991161] [2021-11-25 19:59:42,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:59:42,630 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:59:42,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:59:42,638 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:59:42,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-25 19:59:42,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:59:42,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 19:59:42,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:59:50,184 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 19:59:50,403 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 8 [2021-11-25 19:59:50,719 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:50,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:59:57,343 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 37 treesize of output 35 [2021-11-25 19:59:57,355 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 72 treesize of output 70 [2021-11-25 20:00:18,155 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:00:18,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1640991161] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:18,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523117962] [2021-11-25 20:00:18,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:00:18,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:00:18,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:00:18,160 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:00:18,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:00:18,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:00:18,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:00:18,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:28,626 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 20:00:34,982 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:00:34,987 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:00:34,988 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 21 treesize of output 11 [2021-11-25 20:00:40,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:00:40,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:35,308 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 37 treesize of output 35 [2021-11-25 20:01:35,314 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 72 treesize of output 70 [2021-11-25 20:01:46,845 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:46,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523117962] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:46,845 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:01:46,846 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 12, 11, 12, 11] total 40 [2021-11-25 20:01:46,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91455323] [2021-11-25 20:01:46,846 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:01:46,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 20:01:46,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:01:46,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 20:01:46,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=1298, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:01:46,849 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 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 20:02:28,348 WARN L227 SmtUtils]: Spent 6.52s on a formula simplification that was a NOOP. DAG size: 24 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:02:47,324 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:02:49,989 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.68s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:03:29,017 WARN L227 SmtUtils]: Spent 23.63s on a formula simplification. DAG size of input: 51 DAG size of output: 47 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:03:30,575 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.56s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:03:52,797 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:04:25,364 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:04:45,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:04:45,275 INFO L93 Difference]: Finished difference Result 67 states and 82 transitions. [2021-11-25 20:04:45,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 20:04:45,308 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 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 21 [2021-11-25 20:04:45,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:04:45,309 INFO L225 Difference]: With dead ends: 67 [2021-11-25 20:04:45,309 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 20:04:45,311 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 82 SyntacticMatches, 7 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1177 ImplicationChecksByTransitivity, 293.9s TimeCoverageRelationStatistics Valid=683, Invalid=2853, Unknown=4, NotChecked=0, Total=3540 [2021-11-25 20:04:45,313 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 131 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 63 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 135 IncrementalHoareTripleChecker+Unchecked, 31.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:04:45,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 111 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 289 Invalid, 1 Unknown, 135 Unchecked, 31.4s Time] [2021-11-25 20:04:45,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 20:04:45,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 31. [2021-11-25 20:04:45,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 30 states have internal predecessors, (38), 0 states have call successors, (0), 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 20:04:45,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2021-11-25 20:04:45,323 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 21 [2021-11-25 20:04:45,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:04:45,323 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2021-11-25 20:04:45,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 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 20:04:45,324 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2021-11-25 20:04:45,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 20:04:45,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:04:45,325 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:04:45,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:04:45,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:04:45,757 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-25 20:04:45,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:04:45,932 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:04:45,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:04:45,933 INFO L85 PathProgramCache]: Analyzing trace with hash 1309634075, now seen corresponding path program 1 times [2021-11-25 20:04:45,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:04:45,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1228722656] [2021-11-25 20:04:45,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:04:45,933 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:04:45,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:04:45,934 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:04:45,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-25 20:04:46,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:04:46,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:04:46,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:04:46,194 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:04:46,194 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:04:46,194 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:04:46,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1228722656] [2021-11-25 20:04:46,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1228722656] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:04:46,194 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:04:46,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:04:46,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610478121] [2021-11-25 20:04:46,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:04:46,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:04:46,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:04:46,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:04:46,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:04:46,196 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 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 20:04:46,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:04:46,444 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2021-11-25 20:04:46,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:04:46,450 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-25 20:04:46,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:04:46,451 INFO L225 Difference]: With dead ends: 60 [2021-11-25 20:04:46,451 INFO L226 Difference]: Without dead ends: 44 [2021-11-25 20:04:46,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:04:46,453 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:04:46,453 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 27 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:04:46,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-25 20:04:46,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 31. [2021-11-25 20:04:46,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 30 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:04:46,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-11-25 20:04:46,461 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 21 [2021-11-25 20:04:46,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:04:46,462 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-11-25 20:04:46,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 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 20:04:46,462 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-11-25 20:04:46,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 20:04:46,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:04:46,463 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:04:46,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:04:46,676 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:04:46,676 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:04:46,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:04:46,677 INFO L85 PathProgramCache]: Analyzing trace with hash 1881533531, now seen corresponding path program 2 times [2021-11-25 20:04:46,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:04:46,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1765049676] [2021-11-25 20:04:46,677 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:04:46,677 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:04:46,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:04:46,678 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:04:46,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-25 20:04:46,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:04:46,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:04:46,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:04:46,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:04:47,787 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:04:47,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:04:48,298 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:04:48,298 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:04:48,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1765049676] [2021-11-25 20:04:48,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1765049676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:04:48,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [957246933] [2021-11-25 20:04:48,299 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:04:48,299 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:04:48,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:04:48,304 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:04:48,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-25 20:04:48,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:04:48,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:04:48,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 20:04:48,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:04:49,458 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:04:49,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:04:50,137 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:04:50,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [957246933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:04:50,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094375598] [2021-11-25 20:04:50,137 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:04:50,137 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:04:50,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:04:50,138 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:04:50,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:04:50,333 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:04:50,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:04:50,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:04:50,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:04:51,407 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:04:51,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:04:51,547 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:04:51,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094375598] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:04:51,548 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:04:51,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 9, 7, 9, 7] total 33 [2021-11-25 20:04:51,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414769253] [2021-11-25 20:04:51,548 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:04:51,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 20:04:51,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:04:51,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 20:04:51,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=854, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:04:51,550 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 33 states, 33 states have (on average 2.727272727272727) internal successors, (90), 33 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:04:55,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:04:55,211 INFO L93 Difference]: Finished difference Result 120 states and 161 transitions. [2021-11-25 20:04:55,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-25 20:04:55,212 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.727272727272727) internal successors, (90), 33 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-25 20:04:55,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:04:55,213 INFO L225 Difference]: With dead ends: 120 [2021-11-25 20:04:55,213 INFO L226 Difference]: Without dead ends: 92 [2021-11-25 20:04:55,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 102 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1008 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=549, Invalid=2421, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 20:04:55,215 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 86 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 206 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:04:55,216 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 91 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 224 Invalid, 0 Unknown, 206 Unchecked, 1.4s Time] [2021-11-25 20:04:55,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-25 20:04:55,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2021-11-25 20:04:55,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.3559322033898304) internal successors, (80), 59 states have internal predecessors, (80), 0 states have call successors, (0), 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 20:04:55,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 80 transitions. [2021-11-25 20:04:55,231 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 80 transitions. Word has length 23 [2021-11-25 20:04:55,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:04:55,231 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 80 transitions. [2021-11-25 20:04:55,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.727272727272727) internal successors, (90), 33 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:04:55,232 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 80 transitions. [2021-11-25 20:04:55,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 20:04:55,233 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:04:55,233 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:04:55,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:04:55,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:04:55,651 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 0 [2021-11-25 20:04:55,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:04:55,848 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:04:55,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:04:55,849 INFO L85 PathProgramCache]: Analyzing trace with hash -1532144674, now seen corresponding path program 3 times [2021-11-25 20:04:55,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:04:55,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2083998910] [2021-11-25 20:04:55,849 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:04:55,849 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:04:55,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:04:55,850 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:04:55,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-25 20:04:56,048 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:04:56,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:04:56,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:04:56,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:04:56,525 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 20:04:57,155 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:04:57,163 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:04:57,164 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 21 treesize of output 11 [2021-11-25 20:04:57,854 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:04:57,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:05:33,754 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 37 treesize of output 35 [2021-11-25 20:05:33,762 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 72 treesize of output 70 [2021-11-25 20:06:03,169 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:06:03,169 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:06:03,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2083998910] [2021-11-25 20:06:03,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2083998910] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:06:03,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1784611160] [2021-11-25 20:06:03,170 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:06:03,170 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:06:03,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:06:03,171 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:06:03,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73ef4184-795e-4d00-87b6-3e73ca5cad0e/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-25 20:06:03,495 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:06:03,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:06:03,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:06:03,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:06:09,165 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