./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH --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 1f7b08d697525a6b6e4b6c32e081a52208b7f6ea0ef3da259b2ed32d3a516e9b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 04:12:59,283 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 04:12:59,285 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 04:12:59,327 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 04:12:59,328 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 04:12:59,329 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 04:12:59,331 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 04:12:59,333 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 04:12:59,336 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 04:12:59,337 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 04:12:59,338 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 04:12:59,340 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 04:12:59,340 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 04:12:59,342 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 04:12:59,343 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 04:12:59,345 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 04:12:59,346 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 04:12:59,347 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 04:12:59,349 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 04:12:59,352 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 04:12:59,354 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 04:12:59,362 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 04:12:59,364 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 04:12:59,365 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 04:12:59,369 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 04:12:59,378 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 04:12:59,379 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 04:12:59,380 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 04:12:59,381 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 04:12:59,382 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 04:12:59,382 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 04:12:59,383 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 04:12:59,384 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 04:12:59,385 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 04:12:59,386 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 04:12:59,387 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 04:12:59,389 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 04:12:59,389 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 04:12:59,390 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 04:12:59,391 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 04:12:59,393 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 04:12:59,394 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-03 04:12:59,422 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 04:12:59,422 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 04:12:59,423 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 04:12:59,423 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 04:12:59,424 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 04:12:59,424 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 04:12:59,424 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 04:12:59,424 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 04:12:59,425 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 04:12:59,425 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 04:12:59,425 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 04:12:59,425 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 04:12:59,426 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 04:12:59,426 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 04:12:59,426 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 04:12:59,427 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 04:12:59,427 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 04:12:59,427 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 04:12:59,428 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 04:12:59,428 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 04:12:59,428 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 04:12:59,428 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 04:12:59,429 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 04:12:59,429 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 04:12:59,429 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 04:12:59,429 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 04:12:59,429 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 04:12:59,430 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 04:12:59,430 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 04:12:59,430 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 04:12:59,430 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:12:59,431 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 04:12:59,431 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 04:12:59,431 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 04:12:59,431 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 04:12:59,432 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 04:12:59,432 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 04:12:59,432 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 04:12:59,432 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 04:12:59,433 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_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1f7b08d697525a6b6e4b6c32e081a52208b7f6ea0ef3da259b2ed32d3a516e9b [2021-11-03 04:12:59,653 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 04:12:59,689 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 04:12:59,691 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 04:12:59,692 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 04:12:59,693 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 04:12:59,694 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c [2021-11-03 04:12:59,764 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/data/9a7056aa2/30934f56a49242b4b9834bd1a73435dc/FLAG58f3e9a03 [2021-11-03 04:13:00,248 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 04:13:00,249 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c [2021-11-03 04:13:00,272 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/data/9a7056aa2/30934f56a49242b4b9834bd1a73435dc/FLAG58f3e9a03 [2021-11-03 04:13:00,604 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/data/9a7056aa2/30934f56a49242b4b9834bd1a73435dc [2021-11-03 04:13:00,606 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 04:13:00,608 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 04:13:00,609 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 04:13:00,610 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 04:13:00,612 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 04:13:00,613 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:00,614 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2df9068c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00, skipping insertion in model container [2021-11-03 04:13:00,614 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:00,621 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 04:13:00,663 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 04:13:00,889 WARN L228 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_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c[14467,14480] [2021-11-03 04:13:00,892 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:13:00,901 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 04:13:00,959 WARN L228 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_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c[14467,14480] [2021-11-03 04:13:00,960 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:13:00,974 INFO L208 MainTranslator]: Completed translation [2021-11-03 04:13:00,975 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00 WrapperNode [2021-11-03 04:13:00,975 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 04:13:00,976 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 04:13:00,977 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 04:13:00,977 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 04:13:00,984 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:00,995 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:01,029 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 04:13:01,030 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 04:13:01,030 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 04:13:01,030 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 04:13:01,039 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:01,041 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:01,044 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:01,057 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:01,068 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:01,091 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:01,093 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:01,098 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 04:13:01,107 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 04:13:01,108 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 04:13:01,108 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 04:13:01,109 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (1/1) ... [2021-11-03 04:13:01,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:13:01,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:13:01,150 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 04:13:01,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 04:13:01,194 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 04:13:01,195 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 04:13:01,196 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 04:13:01,196 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 04:13:03,936 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 04:13:03,937 INFO L299 CfgBuilder]: Removed 19 assume(true) statements. [2021-11-03 04:13:03,939 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:13:03 BoogieIcfgContainer [2021-11-03 04:13:03,939 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 04:13:03,941 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 04:13:03,941 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 04:13:03,944 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 04:13:03,944 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:13:00" (1/3) ... [2021-11-03 04:13:03,946 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4eca53de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:13:03, skipping insertion in model container [2021-11-03 04:13:03,946 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:13:00" (2/3) ... [2021-11-03 04:13:03,947 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4eca53de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:13:03, skipping insertion in model container [2021-11-03 04:13:03,947 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:13:03" (3/3) ... [2021-11-03 04:13:03,948 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c [2021-11-03 04:13:03,959 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 04:13:03,960 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-03 04:13:04,018 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 04:13:04,028 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 [2021-11-03 04:13:04,028 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-03 04:13:04,042 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:04,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-03 04:13:04,047 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:13:04,047 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-03 04:13:04,048 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:13:04,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:13:04,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1067491558, now seen corresponding path program 1 times [2021-11-03 04:13:04,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:13:04,073 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186822042] [2021-11-03 04:13:04,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:04,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:13:04,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:04,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:13:04,574 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:13:04,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186822042] [2021-11-03 04:13:04,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186822042] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:13:04,575 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:13:04,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:13:04,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239365440] [2021-11-03 04:13:04,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:13:04,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:13:04,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:13:04,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:04,595 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:04,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:13:04,744 INFO L93 Difference]: Finished difference Result 51 states and 87 transitions. [2021-11-03 04:13:04,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:13:04,746 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-03 04:13:04,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:13:04,755 INFO L225 Difference]: With dead ends: 51 [2021-11-03 04:13:04,755 INFO L226 Difference]: Without dead ends: 34 [2021-11-03 04:13:04,759 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:04,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-03 04:13:04,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2021-11-03 04:13:04,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:04,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 40 transitions. [2021-11-03 04:13:04,799 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 40 transitions. Word has length 6 [2021-11-03 04:13:04,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:13:04,800 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 40 transitions. [2021-11-03 04:13:04,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:04,801 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 40 transitions. [2021-11-03 04:13:04,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-03 04:13:04,801 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:13:04,801 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:13:04,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 04:13:04,802 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:13:04,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:13:04,807 INFO L85 PathProgramCache]: Analyzing trace with hash -1330105738, now seen corresponding path program 1 times [2021-11-03 04:13:04,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:13:04,808 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777193191] [2021-11-03 04:13:04,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:04,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:13:04,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:05,002 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:13:05,002 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:13:05,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777193191] [2021-11-03 04:13:05,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777193191] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:13:05,003 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:13:05,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:13:05,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916587362] [2021-11-03 04:13:05,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:13:05,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:13:05,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:13:05,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:05,007 INFO L87 Difference]: Start difference. First operand 25 states and 40 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) [2021-11-03 04:13:05,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:13:05,092 INFO L93 Difference]: Finished difference Result 54 states and 84 transitions. [2021-11-03 04:13:05,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:13:05,093 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 [2021-11-03 04:13:05,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:13:05,096 INFO L225 Difference]: With dead ends: 54 [2021-11-03 04:13:05,096 INFO L226 Difference]: Without dead ends: 36 [2021-11-03 04:13:05,097 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:05,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-03 04:13:05,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-03 04:13:05,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:05,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 39 transitions. [2021-11-03 04:13:05,107 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 39 transitions. Word has length 7 [2021-11-03 04:13:05,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:13:05,108 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 39 transitions. [2021-11-03 04:13:05,109 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) [2021-11-03 04:13:05,109 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 39 transitions. [2021-11-03 04:13:05,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 04:13:05,110 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:13:05,110 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:13:05,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 04:13:05,111 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:13:05,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:13:05,120 INFO L85 PathProgramCache]: Analyzing trace with hash 1659241167, now seen corresponding path program 1 times [2021-11-03 04:13:05,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:13:05,121 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956935714] [2021-11-03 04:13:05,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:05,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:13:05,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:05,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:13:05,229 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:13:05,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956935714] [2021-11-03 04:13:05,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [956935714] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:13:05,230 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:13:05,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:13:05,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749590346] [2021-11-03 04:13:05,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:13:05,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:13:05,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:13:05,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:05,232 INFO L87 Difference]: Start difference. First operand 25 states and 39 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:05,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:13:05,303 INFO L93 Difference]: Finished difference Result 54 states and 83 transitions. [2021-11-03 04:13:05,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:13:05,304 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 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 [2021-11-03 04:13:05,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:13:05,305 INFO L225 Difference]: With dead ends: 54 [2021-11-03 04:13:05,305 INFO L226 Difference]: Without dead ends: 36 [2021-11-03 04:13:05,306 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:05,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-03 04:13:05,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-03 04:13:05,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 24 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) [2021-11-03 04:13:05,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 38 transitions. [2021-11-03 04:13:05,311 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 38 transitions. Word has length 8 [2021-11-03 04:13:05,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:13:05,311 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 38 transitions. [2021-11-03 04:13:05,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:05,312 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 38 transitions. [2021-11-03 04:13:05,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-03 04:13:05,312 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:13:05,313 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:13:05,313 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 04:13:05,313 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:13:05,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:13:05,314 INFO L85 PathProgramCache]: Analyzing trace with hash -154833537, now seen corresponding path program 1 times [2021-11-03 04:13:05,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:13:05,314 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351294648] [2021-11-03 04:13:05,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:05,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:13:05,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:05,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:13:05,391 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:13:05,391 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351294648] [2021-11-03 04:13:05,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351294648] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:13:05,392 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:13:05,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:13:05,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695307236] [2021-11-03 04:13:05,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:13:05,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:13:05,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:13:05,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:05,394 INFO L87 Difference]: Start difference. First operand 25 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:05,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:13:05,477 INFO L93 Difference]: Finished difference Result 54 states and 82 transitions. [2021-11-03 04:13:05,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:13:05,478 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-03 04:13:05,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:13:05,478 INFO L225 Difference]: With dead ends: 54 [2021-11-03 04:13:05,478 INFO L226 Difference]: Without dead ends: 36 [2021-11-03 04:13:05,479 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:05,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-03 04:13:05,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2021-11-03 04:13:05,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 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) [2021-11-03 04:13:05,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 37 transitions. [2021-11-03 04:13:05,483 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 37 transitions. Word has length 9 [2021-11-03 04:13:05,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:13:05,484 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 37 transitions. [2021-11-03 04:13:05,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:05,484 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 37 transitions. [2021-11-03 04:13:05,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-03 04:13:05,485 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:13:05,485 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:13:05,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-03 04:13:05,485 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:13:05,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:13:05,486 INFO L85 PathProgramCache]: Analyzing trace with hash 56201383, now seen corresponding path program 1 times [2021-11-03 04:13:05,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:13:05,486 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126261592] [2021-11-03 04:13:05,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:05,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:13:05,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:05,668 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:13:05,668 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:13:05,668 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126261592] [2021-11-03 04:13:05,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126261592] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:13:05,669 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:13:05,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:13:05,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391724873] [2021-11-03 04:13:05,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:13:05,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:13:05,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:13:05,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:05,671 INFO L87 Difference]: Start difference. First operand 25 states and 37 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:05,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:13:05,746 INFO L93 Difference]: Finished difference Result 52 states and 78 transitions. [2021-11-03 04:13:05,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:13:05,747 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-03 04:13:05,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:13:05,747 INFO L225 Difference]: With dead ends: 52 [2021-11-03 04:13:05,748 INFO L226 Difference]: Without dead ends: 34 [2021-11-03 04:13:05,748 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:05,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-03 04:13:05,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-11-03 04:13:05,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.52) internal successors, (38), 25 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) [2021-11-03 04:13:05,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 38 transitions. [2021-11-03 04:13:05,752 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 38 transitions. Word has length 11 [2021-11-03 04:13:05,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:13:05,752 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 38 transitions. [2021-11-03 04:13:05,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:05,753 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 38 transitions. [2021-11-03 04:13:05,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-03 04:13:05,753 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:13:05,754 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:13:05,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-03 04:13:05,754 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:13:05,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:13:05,754 INFO L85 PathProgramCache]: Analyzing trace with hash 1654344646, now seen corresponding path program 1 times [2021-11-03 04:13:05,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:13:05,755 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495996852] [2021-11-03 04:13:05,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:05,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:13:05,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:06,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:13:06,027 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:13:06,027 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495996852] [2021-11-03 04:13:06,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495996852] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:13:06,028 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:13:06,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:13:06,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439973260] [2021-11-03 04:13:06,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:13:06,030 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:13:06,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:13:06,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:06,037 INFO L87 Difference]: Start difference. First operand 26 states and 38 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 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) [2021-11-03 04:13:06,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:13:06,088 INFO L93 Difference]: Finished difference Result 53 states and 79 transitions. [2021-11-03 04:13:06,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:13:06,089 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-03 04:13:06,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:13:06,089 INFO L225 Difference]: With dead ends: 53 [2021-11-03 04:13:06,089 INFO L226 Difference]: Without dead ends: 35 [2021-11-03 04:13:06,090 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:06,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-03 04:13:06,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-11-03 04:13:06,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:06,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-03 04:13:06,094 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 12 [2021-11-03 04:13:06,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:13:06,095 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-03 04:13:06,095 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 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) [2021-11-03 04:13:06,095 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-03 04:13:06,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-03 04:13:06,096 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:13:06,096 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:13:06,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-03 04:13:06,096 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:13:06,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:13:06,097 INFO L85 PathProgramCache]: Analyzing trace with hash -2092951700, now seen corresponding path program 1 times [2021-11-03 04:13:06,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:13:06,097 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720594959] [2021-11-03 04:13:06,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:06,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:13:06,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:06,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:13:06,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:13:06,225 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720594959] [2021-11-03 04:13:06,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720594959] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:13:06,226 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:13:06,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:13:06,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680212109] [2021-11-03 04:13:06,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:13:06,226 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:13:06,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:13:06,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:06,227 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 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) [2021-11-03 04:13:06,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:13:06,286 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-11-03 04:13:06,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:13:06,287 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 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) Word has length 14 [2021-11-03 04:13:06,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:13:06,287 INFO L225 Difference]: With dead ends: 53 [2021-11-03 04:13:06,287 INFO L226 Difference]: Without dead ends: 35 [2021-11-03 04:13:06,288 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:13:06,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-03 04:13:06,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2021-11-03 04:13:06,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:13:06,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2021-11-03 04:13:06,292 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 14 [2021-11-03 04:13:06,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:13:06,293 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2021-11-03 04:13:06,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 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) [2021-11-03 04:13:06,293 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2021-11-03 04:13:06,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-03 04:13:06,294 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:13:06,294 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:13:06,294 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-03 04:13:06,294 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:13:06,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:13:06,295 INFO L85 PathProgramCache]: Analyzing trace with hash -464068504, now seen corresponding path program 1 times [2021-11-03 04:13:06,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:13:06,295 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408235030] [2021-11-03 04:13:06,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:06,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:13:06,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:06,379 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:13:06,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:13:06,380 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408235030] [2021-11-03 04:13:06,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408235030] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:13:06,380 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:13:06,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 04:13:06,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201558491] [2021-11-03 04:13:06,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:13:06,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:13:06,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:13:06,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:13:06,382 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 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) [2021-11-03 04:13:06,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:13:06,512 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2021-11-03 04:13:06,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-03 04:13:06,512 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 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 15 [2021-11-03 04:13:06,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:13:06,513 INFO L225 Difference]: With dead ends: 73 [2021-11-03 04:13:06,513 INFO L226 Difference]: Without dead ends: 55 [2021-11-03 04:13:06,514 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-03 04:13:06,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-03 04:13:06,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 32. [2021-11-03 04:13:06,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 31 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) [2021-11-03 04:13:06,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-11-03 04:13:06,519 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 15 [2021-11-03 04:13:06,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:13:06,519 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-11-03 04:13:06,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 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) [2021-11-03 04:13:06,520 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-11-03 04:13:06,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-03 04:13:06,520 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:13:06,521 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:13:06,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-03 04:13:06,521 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:13:06,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:13:06,521 INFO L85 PathProgramCache]: Analyzing trace with hash 972440672, now seen corresponding path program 1 times [2021-11-03 04:13:06,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:13:06,522 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004021771] [2021-11-03 04:13:06,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:06,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:13:06,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:06,929 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:13:06,929 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:13:06,930 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004021771] [2021-11-03 04:13:06,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004021771] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:13:06,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005834699] [2021-11-03 04:13:06,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:06,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:13:06,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:13:06,935 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:13:06,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_644abd7d-c2ee-43ad-967f-ca7086f8c7d3/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 04:13:07,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:07,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-03 04:13:07,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:13:25,032 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:13:25,033 INFO L328 TraceCheckSpWp]: Computing backward predicates...