./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V --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 a70bdaebce973cfb63a6da68866c665cdef037b6b862a38db5ed10fbf681a6e5 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:47:58,577 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:47:58,579 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:47:58,608 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:47:58,609 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:47:58,611 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:47:58,613 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:47:58,615 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:47:58,617 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:47:58,618 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:47:58,619 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:47:58,621 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:47:58,621 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:47:58,623 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:47:58,624 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:47:58,626 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:47:58,627 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:47:58,628 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:47:58,631 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:47:58,633 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:47:58,636 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:47:58,637 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:47:58,639 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:47:58,640 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:47:58,644 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:47:58,645 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:47:58,645 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:47:58,646 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:47:58,647 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:47:58,648 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:47:58,649 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:47:58,650 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:47:58,651 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:47:58,652 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:47:58,653 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:47:58,654 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:47:58,655 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:47:58,655 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:47:58,656 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:47:58,657 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:47:58,658 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:47:58,659 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:47:58,684 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:47:58,684 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:47:58,684 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:47:58,685 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:47:58,685 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:47:58,686 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:47:58,686 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:47:58,686 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:47:58,686 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:47:58,686 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:47:58,687 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:47:58,687 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:47:58,687 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:47:58,687 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:47:58,688 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:47:58,688 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:47:58,688 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:47:58,688 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:47:58,689 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:47:58,689 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:47:58,690 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:47:58,690 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:47:58,690 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:47:58,690 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:47:58,690 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:47:58,691 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:47:58,691 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:47:58,691 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:47:58,691 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:47:58,691 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:47:58,692 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:47:58,692 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:47:58,692 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:47:58,692 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:47:58,693 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:47:58,693 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:47:58,693 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:47:58,693 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:47:58,694 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:47:58,694 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:47:58,694 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:47:58,694 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_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a70bdaebce973cfb63a6da68866c665cdef037b6b862a38db5ed10fbf681a6e5 [2021-11-23 02:47:58,966 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:47:58,987 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:47:58,990 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:47:58,991 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:47:58,992 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:47:58,993 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c [2021-11-23 02:47:59,099 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/data/662f0eb51/0f5fefcfd3e5435b997ffe4fcba72d88/FLAG8c4fd4e36 [2021-11-23 02:47:59,656 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:47:59,657 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c [2021-11-23 02:47:59,663 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/data/662f0eb51/0f5fefcfd3e5435b997ffe4fcba72d88/FLAG8c4fd4e36 [2021-11-23 02:48:00,028 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/data/662f0eb51/0f5fefcfd3e5435b997ffe4fcba72d88 [2021-11-23 02:48:00,033 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:48:00,034 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:48:00,037 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:48:00,039 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:48:00,046 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:48:00,047 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,048 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e38c8ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00, skipping insertion in model container [2021-11-23 02:48:00,049 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,056 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:48:00,070 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:48:00,247 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_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c[458,471] [2021-11-23 02:48:00,265 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:48:00,280 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:48:00,303 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_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c[458,471] [2021-11-23 02:48:00,311 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:48:00,322 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:48:00,322 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00 WrapperNode [2021-11-23 02:48:00,323 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:48:00,323 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:48:00,324 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:48:00,324 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:48:00,329 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,335 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,353 INFO L137 Inliner]: procedures = 14, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 43 [2021-11-23 02:48:00,353 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:48:00,354 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:48:00,354 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:48:00,354 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:48:00,363 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,363 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,365 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,365 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,368 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,372 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,373 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,375 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:48:00,376 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:48:00,376 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:48:00,376 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:48:00,377 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (1/1) ... [2021-11-23 02:48:00,384 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:48:00,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:48:00,409 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:48:00,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:48:00,452 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:48:00,452 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:48:00,453 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:48:00,453 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:48:00,453 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 02:48:00,453 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 02:48:00,501 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:48:00,503 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:48:00,611 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:48:00,632 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:48:00,633 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:48:00,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:48:00 BoogieIcfgContainer [2021-11-23 02:48:00,635 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:48:00,637 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:48:00,637 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:48:00,641 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:48:00,641 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:48:00" (1/3) ... [2021-11-23 02:48:00,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49e8a28d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:48:00, skipping insertion in model container [2021-11-23 02:48:00,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:48:00" (2/3) ... [2021-11-23 02:48:00,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49e8a28d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:48:00, skipping insertion in model container [2021-11-23 02:48:00,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:48:00" (3/3) ... [2021-11-23 02:48:00,644 INFO L111 eAbstractionObserver]: Analyzing ICFG ps5-ll_unwindbound50.c [2021-11-23 02:48:00,649 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:48:00,649 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:48:00,696 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:48:00,705 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 [2021-11-23 02:48:00,706 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:48:00,722 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:48:00,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:48:00,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:48:00,728 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:48:00,728 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:48:00,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:48:00,734 INFO L85 PathProgramCache]: Analyzing trace with hash -1749202120, now seen corresponding path program 1 times [2021-11-23 02:48:00,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:48:00,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148526762] [2021-11-23 02:48:00,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:00,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:48:00,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:48:00,875 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:48:00,875 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:48:00,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148526762] [2021-11-23 02:48:00,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148526762] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:48:00,877 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:48:00,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:48:00,879 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864749090] [2021-11-23 02:48:00,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:48:00,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 02:48:00,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:48:00,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 02:48:00,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:48:00,916 INFO L87 Difference]: Start difference. First operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:48:00,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:48:00,942 INFO L93 Difference]: Finished difference Result 29 states and 42 transitions. [2021-11-23 02:48:00,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 02:48:00,949 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-23 02:48:00,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:48:00,957 INFO L225 Difference]: With dead ends: 29 [2021-11-23 02:48:00,957 INFO L226 Difference]: Without dead ends: 13 [2021-11-23 02:48:00,960 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:48:00,964 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:48:00,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:48:00,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-23 02:48:00,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-23 02:48:00,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:48:00,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2021-11-23 02:48:01,001 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2021-11-23 02:48:01,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:48:01,002 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2021-11-23 02:48:01,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:48:01,002 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2021-11-23 02:48:01,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:48:01,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:48:01,003 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:48:01,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:48:01,004 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:48:01,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:48:01,005 INFO L85 PathProgramCache]: Analyzing trace with hash 1208885392, now seen corresponding path program 1 times [2021-11-23 02:48:01,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:48:01,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026387062] [2021-11-23 02:48:01,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:01,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:48:01,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:48:01,058 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:48:01,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:48:01,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026387062] [2021-11-23 02:48:01,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026387062] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:48:01,060 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:48:01,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:48:01,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032359409] [2021-11-23 02:48:01,061 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:48:01,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:48:01,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:48:01,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:48:01,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:48:01,064 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:48:01,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:48:01,086 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2021-11-23 02:48:01,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:48:01,087 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:48:01,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:48:01,088 INFO L225 Difference]: With dead ends: 23 [2021-11-23 02:48:01,088 INFO L226 Difference]: Without dead ends: 15 [2021-11-23 02:48:01,089 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:48:01,091 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:48:01,092 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:48:01,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-23 02:48:01,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-23 02:48:01,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:48:01,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-23 02:48:01,097 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2021-11-23 02:48:01,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:48:01,098 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-23 02:48:01,098 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:48:01,098 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-23 02:48:01,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:48:01,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:48:01,099 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:48:01,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:48:01,100 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:48:01,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:48:01,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1210672852, now seen corresponding path program 1 times [2021-11-23 02:48:01,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:48:01,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270417772] [2021-11-23 02:48:01,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:01,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:48:01,115 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:48:01,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1448046109] [2021-11-23 02:48:01,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:01,116 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:48:01,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:48:01,118 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:48:01,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:48:01,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:48:01,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:48:01,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:48:01,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:48:01,360 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:48:01,360 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:48:01,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270417772] [2021-11-23 02:48:01,362 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:48:01,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448046109] [2021-11-23 02:48:01,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448046109] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:48:01,363 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:48:01,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:48:01,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030266416] [2021-11-23 02:48:01,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:48:01,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:48:01,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:48:01,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:48:01,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:48:01,374 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:48:01,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:48:01,456 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2021-11-23 02:48:01,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:48:01,459 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:48:01,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:48:01,460 INFO L225 Difference]: With dead ends: 25 [2021-11-23 02:48:01,460 INFO L226 Difference]: Without dead ends: 21 [2021-11-23 02:48:01,461 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:48:01,464 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:48:01,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 48 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:48:01,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-23 02:48:01,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-23 02:48:01,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:48:01,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-11-23 02:48:01,473 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 7 [2021-11-23 02:48:01,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:48:01,473 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-11-23 02:48:01,474 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:48:01,474 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-11-23 02:48:01,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 02:48:01,475 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:48:01,475 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:48:01,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:48:01,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:48:01,690 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:48:01,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:48:01,691 INFO L85 PathProgramCache]: Analyzing trace with hash 479296502, now seen corresponding path program 1 times [2021-11-23 02:48:01,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:48:01,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491891859] [2021-11-23 02:48:01,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:01,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:48:01,703 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:48:01,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1487354085] [2021-11-23 02:48:01,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:01,704 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:48:01,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:48:01,705 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:48:01,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:48:01,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:48:01,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:48:01,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:48:01,848 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:48:01,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:48:01,926 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:48:01,927 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:48:01,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491891859] [2021-11-23 02:48:01,931 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:48:01,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487354085] [2021-11-23 02:48:01,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487354085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:48:01,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [329003164] [2021-11-23 02:48:01,958 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:48:01,965 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:48:01,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:48:01,977 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:48:01,977 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:48:03,919 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 85 for LOIs [2021-11-23 02:48:04,247 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:48:07,347 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '317#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| Int)) (and (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9|) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| 1) (= |#NULL.offset| 0) (= ~counter~0 2) (= |#NULL.base| 0))) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9|) (= (ite (= (+ (* 30 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9|) |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9|) (+ (* 6 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9|)) (* 10 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9|)) (* 15 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_9|)))) 1 0) |__VERIFIER_assert_#in~cond|))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 02:48:07,347 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:48:07,347 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:48:07,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-23 02:48:07,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717377411] [2021-11-23 02:48:07,348 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:48:07,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:48:07,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:48:07,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:48:07,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:48:07,350 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:48:07,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:48:07,438 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2021-11-23 02:48:07,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:48:07,439 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2021-11-23 02:48:07,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:48:07,440 INFO L225 Difference]: With dead ends: 55 [2021-11-23 02:48:07,440 INFO L226 Difference]: Without dead ends: 47 [2021-11-23 02:48:07,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:48:07,442 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 35 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:48:07,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 83 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:48:07,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-23 02:48:07,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2021-11-23 02:48:07,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.25) internal successors, (35), 31 states have internal predecessors, (35), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 02:48:07,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2021-11-23 02:48:07,465 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 15 [2021-11-23 02:48:07,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:48:07,466 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2021-11-23 02:48:07,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:48:07,469 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2021-11-23 02:48:07,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 02:48:07,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:48:07,470 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:48:07,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:48:07,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:48:07,685 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:48:07,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:48:07,686 INFO L85 PathProgramCache]: Analyzing trace with hash 481083962, now seen corresponding path program 1 times [2021-11-23 02:48:07,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:48:07,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518571439] [2021-11-23 02:48:07,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:07,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:48:07,699 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:48:07,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1337544145] [2021-11-23 02:48:07,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:07,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:48:07,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:48:07,717 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:48:07,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:48:07,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:48:07,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:48:07,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:48:07,879 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:48:07,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:48:08,015 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 02:48:08,015 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:48:08,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518571439] [2021-11-23 02:48:08,016 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:48:08,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337544145] [2021-11-23 02:48:08,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337544145] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:48:08,016 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:48:08,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-23 02:48:08,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800446621] [2021-11-23 02:48:08,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:48:08,018 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:48:08,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:48:08,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:48:08,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:48:08,021 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:48:08,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:48:08,168 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2021-11-23 02:48:08,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:48:08,169 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-23 02:48:08,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:48:08,170 INFO L225 Difference]: With dead ends: 57 [2021-11-23 02:48:08,170 INFO L226 Difference]: Without dead ends: 49 [2021-11-23 02:48:08,171 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:48:08,172 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 7 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:48:08,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 33 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:48:08,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-23 02:48:08,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2021-11-23 02:48:08,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 32 states have internal predecessors, (34), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 02:48:08,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2021-11-23 02:48:08,192 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 15 [2021-11-23 02:48:08,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:48:08,192 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2021-11-23 02:48:08,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:48:08,193 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2021-11-23 02:48:08,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 02:48:08,195 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:48:08,195 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:48:08,200 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-23 02:48:08,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:48:08,399 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:48:08,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:48:08,399 INFO L85 PathProgramCache]: Analyzing trace with hash 669026573, now seen corresponding path program 1 times [2021-11-23 02:48:08,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:48:08,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550096839] [2021-11-23 02:48:08,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:08,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:48:08,413 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:48:08,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1080926554] [2021-11-23 02:48:08,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:08,420 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:48:08,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:48:08,425 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:48:08,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:48:08,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:48:08,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:48:08,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:48:08,636 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:48:08,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:48:08,873 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:48:08,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550096839] [2021-11-23 02:48:08,873 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:48:08,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080926554] [2021-11-23 02:48:08,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080926554] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:48:08,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1102008400] [2021-11-23 02:48:08,876 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-23 02:48:08,876 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:48:08,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:48:08,877 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:48:08,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:48:09,612 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-23 02:48:09,621 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:48:10,028 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '846#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:48:10,028 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:48:10,028 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:48:10,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-11-23 02:48:10,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674845312] [2021-11-23 02:48:10,029 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 02:48:10,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:48:10,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:48:10,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:48:10,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:48:10,030 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:48:10,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:48:10,108 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2021-11-23 02:48:10,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:48:10,109 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-11-23 02:48:10,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:48:10,111 INFO L225 Difference]: With dead ends: 48 [2021-11-23 02:48:10,111 INFO L226 Difference]: Without dead ends: 42 [2021-11-23 02:48:10,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:48:10,112 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 2 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:48:10,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 93 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:48:10,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-23 02:48:10,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-11-23 02:48:10,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 02:48:10,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-11-23 02:48:10,122 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 26 [2021-11-23 02:48:10,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:48:10,122 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-11-23 02:48:10,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:48:10,123 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-11-23 02:48:10,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 02:48:10,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:48:10,124 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:48:10,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:48:10,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:48:10,348 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:48:10,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:48:10,349 INFO L85 PathProgramCache]: Analyzing trace with hash 1479325671, now seen corresponding path program 2 times [2021-11-23 02:48:10,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:48:10,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966661852] [2021-11-23 02:48:10,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:48:10,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:48:10,358 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:48:10,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [22085870] [2021-11-23 02:48:10,358 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:48:10,358 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:48:10,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:48:10,359 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:48:10,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dcfc17dd-5c1f-42f9-8fe9-9384dde5d1f6/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process