./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 538775af36be57be36a6cd470d0ff7a3d7714753249a7d4cb9a7b907cdacda78 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 14:01:55,714 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 14:01:55,716 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 14:01:55,732 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 14:01:55,733 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 14:01:55,733 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 14:01:55,734 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 14:01:55,735 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 14:01:55,736 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 14:01:55,737 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 14:01:55,737 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 14:01:55,738 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 14:01:55,738 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 14:01:55,739 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 14:01:55,739 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 14:01:55,740 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 14:01:55,741 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 14:01:55,741 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 14:01:55,742 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 14:01:55,743 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 14:01:55,744 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 14:01:55,745 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 14:01:55,746 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 14:01:55,746 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 14:01:55,748 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 14:01:55,749 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 14:01:55,749 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 14:01:55,749 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 14:01:55,750 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 14:01:55,750 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 14:01:55,750 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 14:01:55,751 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 14:01:55,751 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 14:01:55,752 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 14:01:55,753 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 14:01:55,753 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 14:01:55,753 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 14:01:55,753 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 14:01:55,753 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 14:01:55,754 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 14:01:55,754 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 14:01:55,755 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 14:01:55,769 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 14:01:55,776 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 14:01:55,776 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 14:01:55,776 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 14:01:55,777 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 14:01:55,777 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 14:01:55,777 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 14:01:55,777 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 14:01:55,777 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 14:01:55,778 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 14:01:55,778 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 14:01:55,778 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 14:01:55,778 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 14:01:55,778 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 14:01:55,778 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 14:01:55,778 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 14:01:55,778 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 14:01:55,779 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 14:01:55,779 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 14:01:55,779 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 14:01:55,779 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 14:01:55,779 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 14:01:55,780 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 14:01:55,780 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 14:01:55,780 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 14:01:55,780 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 14:01:55,780 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 14:01:55,780 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 14:01:55,780 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 14:01:55,780 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 14:01:55,781 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 14:01:55,781 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 14:01:55,781 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 14:01:55,781 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 14:01:55,781 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 14:01:55,781 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 14:01:55,781 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 14:01:55,781 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 14:01:55,781 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 14:01:55,782 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 14:01:55,782 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 14:01:55,782 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 538775af36be57be36a6cd470d0ff7a3d7714753249a7d4cb9a7b907cdacda78 [2022-12-14 14:01:55,942 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 14:01:55,959 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 14:01:55,962 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 14:01:55,963 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 14:01:55,963 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 14:01:55,964 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c [2022-12-14 14:01:58,562 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 14:01:58,724 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 14:01:58,725 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c [2022-12-14 14:01:58,730 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/data/affcdb961/9345a2ca80884f7cb17231c2b159146b/FLAGaefab3684 [2022-12-14 14:01:59,140 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/data/affcdb961/9345a2ca80884f7cb17231c2b159146b [2022-12-14 14:01:59,142 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 14:01:59,143 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 14:01:59,144 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 14:01:59,144 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 14:01:59,147 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 14:01:59,148 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,149 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@602ba5a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59, skipping insertion in model container [2022-12-14 14:01:59,149 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,155 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 14:01:59,164 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 14:01:59,270 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c[319,332] [2022-12-14 14:01:59,281 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 14:01:59,289 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 14:01:59,297 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c[319,332] [2022-12-14 14:01:59,300 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 14:01:59,311 INFO L208 MainTranslator]: Completed translation [2022-12-14 14:01:59,311 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59 WrapperNode [2022-12-14 14:01:59,311 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 14:01:59,312 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 14:01:59,312 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 14:01:59,312 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 14:01:59,317 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,322 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,334 INFO L138 Inliner]: procedures = 12, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 43 [2022-12-14 14:01:59,335 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 14:01:59,335 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 14:01:59,335 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 14:01:59,335 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 14:01:59,342 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,342 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,343 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,344 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,346 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,349 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,350 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,351 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,352 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 14:01:59,353 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 14:01:59,353 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 14:01:59,353 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 14:01:59,354 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (1/1) ... [2022-12-14 14:01:59,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 14:01:59,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:01:59,381 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 14:01:59,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 14:01:59,413 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 14:01:59,413 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 14:01:59,413 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 14:01:59,414 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 14:01:59,414 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 14:01:59,414 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 14:01:59,467 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 14:01:59,469 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 14:01:59,548 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 14:01:59,566 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 14:01:59,566 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-12-14 14:01:59,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:01:59 BoogieIcfgContainer [2022-12-14 14:01:59,568 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 14:01:59,570 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 14:01:59,570 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 14:01:59,572 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 14:01:59,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 02:01:59" (1/3) ... [2022-12-14 14:01:59,573 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32dfbad6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:01:59, skipping insertion in model container [2022-12-14 14:01:59,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:01:59" (2/3) ... [2022-12-14 14:01:59,574 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32dfbad6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:01:59, skipping insertion in model container [2022-12-14 14:01:59,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:01:59" (3/3) ... [2022-12-14 14:01:59,575 INFO L112 eAbstractionObserver]: Analyzing ICFG mono-crafted_14.c [2022-12-14 14:01:59,588 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 14:01:59,589 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 14:01:59,620 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 14:01:59,624 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@131106c7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 14:01:59,624 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 14:01:59,627 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 14:01:59,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 14:01:59,631 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:01:59,632 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:01:59,632 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:01:59,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:01:59,636 INFO L85 PathProgramCache]: Analyzing trace with hash -212380657, now seen corresponding path program 1 times [2022-12-14 14:01:59,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:01:59,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236881396] [2022-12-14 14:01:59,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:01:59,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:01:59,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:01:59,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:59,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:01:59,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236881396] [2022-12-14 14:01:59,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236881396] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:01:59,765 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:01:59,765 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 14:01:59,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117672879] [2022-12-14 14:01:59,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:01:59,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:01:59,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:01:59,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:01:59,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:01:59,793 INFO L87 Difference]: Start difference. First operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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) [2022-12-14 14:01:59,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:01:59,826 INFO L93 Difference]: Finished difference Result 25 states and 33 transitions. [2022-12-14 14:01:59,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:01:59,829 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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 [2022-12-14 14:01:59,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:01:59,834 INFO L225 Difference]: With dead ends: 25 [2022-12-14 14:01:59,834 INFO L226 Difference]: Without dead ends: 12 [2022-12-14 14:01:59,836 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:01:59,838 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:01:59,839 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:01:59,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-12-14 14:01:59,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-12-14 14:01:59,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 14:01:59,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2022-12-14 14:01:59,871 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 7 [2022-12-14 14:01:59,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:01:59,871 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2022-12-14 14:01:59,872 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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) [2022-12-14 14:01:59,872 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2022-12-14 14:01:59,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 14:01:59,872 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:01:59,872 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:01:59,872 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 14:01:59,873 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:01:59,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:01:59,873 INFO L85 PathProgramCache]: Analyzing trace with hash -590153153, now seen corresponding path program 1 times [2022-12-14 14:01:59,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:01:59,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504052318] [2022-12-14 14:01:59,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:01:59,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:01:59,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:01:59,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:59,943 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:01:59,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504052318] [2022-12-14 14:01:59,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504052318] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:01:59,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153650827] [2022-12-14 14:01:59,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:01:59,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:01:59,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:01:59,945 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:01:59,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 14:01:59,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:01:59,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 14:01:59,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:00,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:00,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:00,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:00,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153650827] provided 1 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:00,166 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:02:00,166 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2022-12-14 14:02:00,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806331291] [2022-12-14 14:02:00,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:02:00,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 14:02:00,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:00,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 14:02:00,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-12-14 14:02:00,169 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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) [2022-12-14 14:02:00,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:00,185 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2022-12-14 14:02:00,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:02:00,186 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), 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 8 [2022-12-14 14:02:00,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:00,187 INFO L225 Difference]: With dead ends: 21 [2022-12-14 14:02:00,187 INFO L226 Difference]: Without dead ends: 13 [2022-12-14 14:02:00,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-12-14 14:02:00,188 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:00,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:02:00,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-12-14 14:02:00,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-12-14 14:02:00,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 14:02:00,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-12-14 14:02:00,191 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2022-12-14 14:02:00,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:00,191 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-12-14 14:02:00,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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) [2022-12-14 14:02:00,191 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-12-14 14:02:00,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 14:02:00,192 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:00,192 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:02:00,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 14:02:00,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:00,394 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:00,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:00,395 INFO L85 PathProgramCache]: Analyzing trace with hash -1992822231, now seen corresponding path program 1 times [2022-12-14 14:02:00,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:00,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084162406] [2022-12-14 14:02:00,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:00,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:00,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:00,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 14:02:00,571 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:00,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084162406] [2022-12-14 14:02:00,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084162406] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:00,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1085378415] [2022-12-14 14:02:00,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:00,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:00,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:00,573 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:00,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 14:02:00,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:00,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 14:02:00,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:00,642 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:00,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:00,718 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:00,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1085378415] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:00,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1514129241] [2022-12-14 14:02:00,739 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:02:00,739 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:00,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:02:00,746 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:02:00,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:02:01,018 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-12-14 14:02:01,042 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:02:01,186 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '233#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:02:01,186 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:02:01,186 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:01,186 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 4, 4] total 9 [2022-12-14 14:02:01,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923371767] [2022-12-14 14:02:01,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:01,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 14:02:01,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:01,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 14:02:01,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2022-12-14 14:02:01,189 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 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) [2022-12-14 14:02:01,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:01,233 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2022-12-14 14:02:01,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 14:02:01,233 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 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 9 [2022-12-14 14:02:01,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:01,234 INFO L225 Difference]: With dead ends: 27 [2022-12-14 14:02:01,234 INFO L226 Difference]: Without dead ends: 17 [2022-12-14 14:02:01,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2022-12-14 14:02:01,235 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:01,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:02:01,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-12-14 14:02:01,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-12-14 14:02:01,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 14:02:01,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-12-14 14:02:01,240 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 9 [2022-12-14 14:02:01,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:01,240 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-12-14 14:02:01,240 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 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) [2022-12-14 14:02:01,240 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-12-14 14:02:01,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 14:02:01,241 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:01,241 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:02:01,246 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 14:02:01,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:01,443 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:01,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:01,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1408541553, now seen corresponding path program 2 times [2022-12-14 14:02:01,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:01,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862874792] [2022-12-14 14:02:01,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:01,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:01,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:01,700 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:01,700 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:01,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862874792] [2022-12-14 14:02:01,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862874792] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:01,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196618547] [2022-12-14 14:02:01,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:02:01,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:01,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:01,702 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:01,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 14:02:01,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 14:02:01,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:02:01,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 14:02:01,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:01,769 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 14:02:01,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:01,833 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 14:02:01,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196618547] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:01,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1000265055] [2022-12-14 14:02:01,836 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:02:01,836 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:01,836 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:02:01,837 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:02:01,837 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:02:01,995 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2022-12-14 14:02:02,019 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:02:02,228 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '401#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:02:02,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:02:02,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:02,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4] total 14 [2022-12-14 14:02:02,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973499298] [2022-12-14 14:02:02,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:02,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-12-14 14:02:02,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:02,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-12-14 14:02:02,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=324, Unknown=0, NotChecked=0, Total=420 [2022-12-14 14:02:02,231 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 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) [2022-12-14 14:02:02,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:02,299 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2022-12-14 14:02:02,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 14:02:02,300 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 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 13 [2022-12-14 14:02:02,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:02,301 INFO L225 Difference]: With dead ends: 35 [2022-12-14 14:02:02,301 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 14:02:02,301 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2022-12-14 14:02:02,302 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:02,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:02:02,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 14:02:02,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-12-14 14:02:02,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 14:02:02,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-12-14 14:02:02,306 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 13 [2022-12-14 14:02:02,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:02,307 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-12-14 14:02:02,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 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) [2022-12-14 14:02:02,307 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-12-14 14:02:02,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 14:02:02,307 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:02,308 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:02:02,313 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 14:02:02,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:02,509 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:02,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:02,511 INFO L85 PathProgramCache]: Analyzing trace with hash -799650343, now seen corresponding path program 3 times [2022-12-14 14:02:02,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:02,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165656469] [2022-12-14 14:02:02,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:02,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:02,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:02,883 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:02,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:02,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165656469] [2022-12-14 14:02:02,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165656469] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:02,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044262313] [2022-12-14 14:02:02,884 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:02:02,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:02,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:02,885 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:02,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 14:02:02,926 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:02:02,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:02:02,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 14:02:02,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:03,014 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 14:02:03,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:03,217 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 14:02:03,217 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044262313] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:03,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [306973175] [2022-12-14 14:02:03,219 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:02:03,219 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:03,219 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:02:03,219 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:02:03,220 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:02:03,349 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2022-12-14 14:02:03,367 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:02:03,573 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '642#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:02:03,573 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:02:03,573 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:03,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 8] total 27 [2022-12-14 14:02:03,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63224165] [2022-12-14 14:02:03,574 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:03,574 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 14:02:03,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:03,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 14:02:03,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=820, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 14:02:03,576 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 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) [2022-12-14 14:02:03,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:03,727 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2022-12-14 14:02:03,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 14:02:03,728 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 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 18 [2022-12-14 14:02:03,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:03,728 INFO L225 Difference]: With dead ends: 45 [2022-12-14 14:02:03,728 INFO L226 Difference]: Without dead ends: 31 [2022-12-14 14:02:03,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=478, Invalid=1244, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 14:02:03,730 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:03,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 52 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:02:03,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-12-14 14:02:03,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-12-14 14:02:03,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 28 states have internal predecessors, (30), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 14:02:03,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-12-14 14:02:03,735 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 18 [2022-12-14 14:02:03,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:03,735 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-12-14 14:02:03,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 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) [2022-12-14 14:02:03,736 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-12-14 14:02:03,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 14:02:03,736 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:03,737 INFO L195 NwaCegarLoop]: trace histogram [14, 6, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:02:03,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-12-14 14:02:03,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:03,938 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:03,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:03,940 INFO L85 PathProgramCache]: Analyzing trace with hash 1920281039, now seen corresponding path program 4 times [2022-12-14 14:02:03,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:03,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576167503] [2022-12-14 14:02:03,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:03,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:03,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:04,630 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:04,631 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:04,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576167503] [2022-12-14 14:02:04,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576167503] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:04,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819687077] [2022-12-14 14:02:04,631 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:02:04,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:04,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:04,632 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:04,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 14:02:04,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:04,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 14:02:04,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:04,920 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 14:02:04,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:05,464 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 14:02:05,464 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819687077] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:05,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368539221] [2022-12-14 14:02:05,466 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:02:05,466 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:05,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:02:05,466 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:02:05,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:02:05,621 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-12-14 14:02:05,631 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:02:05,834 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1008#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:02:05,834 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:02:05,834 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:05,834 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 16, 16] total 52 [2022-12-14 14:02:05,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788244175] [2022-12-14 14:02:05,834 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:05,834 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-12-14 14:02:05,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:05,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-12-14 14:02:05,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1101, Invalid=2321, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 14:02:05,837 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 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) [2022-12-14 14:02:06,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:06,256 INFO L93 Difference]: Finished difference Result 63 states and 83 transitions. [2022-12-14 14:02:06,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 14:02:06,256 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 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 27 [2022-12-14 14:02:06,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:06,257 INFO L225 Difference]: With dead ends: 63 [2022-12-14 14:02:06,257 INFO L226 Difference]: Without dead ends: 48 [2022-12-14 14:02:06,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 913 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1725, Invalid=3825, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 14:02:06,259 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:06,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 67 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:02:06,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-12-14 14:02:06,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-12-14 14:02:06,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 45 states have internal predecessors, (47), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 14:02:06,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2022-12-14 14:02:06,266 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 27 [2022-12-14 14:02:06,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:06,267 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2022-12-14 14:02:06,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 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) [2022-12-14 14:02:06,267 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2022-12-14 14:02:06,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 14:02:06,268 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:06,268 INFO L195 NwaCegarLoop]: trace histogram [30, 7, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:02:06,272 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 14:02:06,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 14:02:06,469 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:06,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:06,469 INFO L85 PathProgramCache]: Analyzing trace with hash 1451066521, now seen corresponding path program 5 times [2022-12-14 14:02:06,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:06,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713806279] [2022-12-14 14:02:06,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:06,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:06,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:08,091 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 0 proven. 493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:08,092 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:08,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713806279] [2022-12-14 14:02:08,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713806279] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:08,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213372684] [2022-12-14 14:02:08,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:02:08,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:08,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:08,093 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:08,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 14:02:08,161 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-12-14 14:02:08,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:02:08,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 14:02:08,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:08,906 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 14:02:08,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:10,582 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 14:02:10,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213372684] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:10,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1550020782] [2022-12-14 14:02:10,583 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:02:10,583 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:10,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:02:10,584 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:02:10,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:02:10,689 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-12-14 14:02:10,697 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:02:10,982 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1611#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:02:10,983 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:02:10,983 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:10,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 32, 32] total 101 [2022-12-14 14:02:10,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495932016] [2022-12-14 14:02:10,983 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:10,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2022-12-14 14:02:10,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:10,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2022-12-14 14:02:10,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4245, Invalid=7311, Unknown=0, NotChecked=0, Total=11556 [2022-12-14 14:02:10,988 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 102 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 101 states have internal predecessors, (109), 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) [2022-12-14 14:02:12,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:12,123 INFO L93 Difference]: Finished difference Result 97 states and 133 transitions. [2022-12-14 14:02:12,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-12-14 14:02:12,123 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 101 states have internal predecessors, (109), 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 44 [2022-12-14 14:02:12,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:12,124 INFO L225 Difference]: With dead ends: 97 [2022-12-14 14:02:12,124 INFO L226 Difference]: Without dead ends: 81 [2022-12-14 14:02:12,126 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2654 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=6549, Invalid=12911, Unknown=0, NotChecked=0, Total=19460 [2022-12-14 14:02:12,127 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:12,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 101 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:02:12,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-12-14 14:02:12,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-12-14 14:02:12,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 78 states have internal predecessors, (80), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 14:02:12,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-12-14 14:02:12,133 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 44 [2022-12-14 14:02:12,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:12,133 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-12-14 14:02:12,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 101 states have internal predecessors, (109), 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) [2022-12-14 14:02:12,133 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-12-14 14:02:12,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-12-14 14:02:12,134 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:12,134 INFO L195 NwaCegarLoop]: trace histogram [62, 8, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:02:12,139 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 14:02:12,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 14:02:12,335 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:12,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:12,337 INFO L85 PathProgramCache]: Analyzing trace with hash 1290736399, now seen corresponding path program 6 times [2022-12-14 14:02:12,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:12,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694142529] [2022-12-14 14:02:12,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:12,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:12,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:17,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1989 backedges. 0 proven. 1989 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:17,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:17,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694142529] [2022-12-14 14:02:17,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694142529] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:17,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1766979581] [2022-12-14 14:02:17,288 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:02:17,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:17,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:17,289 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:17,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 14:02:17,374 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:02:17,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:02:17,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 14:02:17,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:20,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1989 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 14:02:20,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:26,476 INFO L134 CoverageAnalysis]: Checked inductivity of 1989 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 14:02:26,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1766979581] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:26,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1343174507] [2022-12-14 14:02:26,477 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:02:26,477 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:26,477 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:02:26,477 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:02:26,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:02:26,597 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2022-12-14 14:02:26,614 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:02:27,265 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2675#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:02:27,266 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:02:27,266 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:27,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 64, 64] total 198 [2022-12-14 14:02:27,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570029562] [2022-12-14 14:02:27,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:27,267 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 199 states [2022-12-14 14:02:27,267 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:27,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 199 interpolants. [2022-12-14 14:02:27,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16702, Invalid=25118, Unknown=0, NotChecked=0, Total=41820 [2022-12-14 14:02:27,279 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 199 states, 199 states have (on average 1.035175879396985) internal successors, (206), 198 states have internal predecessors, (206), 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) [2022-12-14 14:02:31,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:31,825 INFO L93 Difference]: Finished difference Result 163 states and 231 transitions. [2022-12-14 14:02:31,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2022-12-14 14:02:31,825 INFO L78 Accepts]: Start accepts. Automaton has has 199 states, 199 states have (on average 1.035175879396985) internal successors, (206), 198 states have internal predecessors, (206), 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 77 [2022-12-14 14:02:31,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:31,826 INFO L225 Difference]: With dead ends: 163 [2022-12-14 14:02:31,826 INFO L226 Difference]: Without dead ends: 146 [2022-12-14 14:02:31,831 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8499 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=25470, Invalid=46622, Unknown=0, NotChecked=0, Total=72092 [2022-12-14 14:02:31,831 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:31,831 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 59 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 14:02:31,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-12-14 14:02:31,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2022-12-14 14:02:31,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 143 states have internal predecessors, (145), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 14:02:31,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 148 transitions. [2022-12-14 14:02:31,840 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 148 transitions. Word has length 77 [2022-12-14 14:02:31,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:31,841 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 148 transitions. [2022-12-14 14:02:31,841 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 199 states, 199 states have (on average 1.035175879396985) internal successors, (206), 198 states have internal predecessors, (206), 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) [2022-12-14 14:02:31,841 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 148 transitions. [2022-12-14 14:02:31,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-12-14 14:02:31,842 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:31,842 INFO L195 NwaCegarLoop]: trace histogram [126, 9, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:02:31,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-12-14 14:02:32,043 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:32,044 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:32,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:32,045 INFO L85 PathProgramCache]: Analyzing trace with hash -1927924903, now seen corresponding path program 7 times [2022-12-14 14:02:32,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:32,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767284436] [2022-12-14 14:02:32,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:32,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:32,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:52,917 INFO L134 CoverageAnalysis]: Checked inductivity of 8046 backedges. 0 proven. 8046 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:52,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:52,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767284436] [2022-12-14 14:02:52,917 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767284436] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:52,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2041317095] [2022-12-14 14:02:52,917 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:02:52,918 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:52,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:52,918 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:52,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 14:02:53,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:53,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 128 conjunts are in the unsatisfiable core [2022-12-14 14:02:53,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:03:03,087 INFO L134 CoverageAnalysis]: Checked inductivity of 8046 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 14:03:03,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:03:24,991 INFO L134 CoverageAnalysis]: Checked inductivity of 8046 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 14:03:24,991 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2041317095] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:03:24,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1288310678] [2022-12-14 14:03:24,993 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:03:24,993 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:03:24,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:03:24,993 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:03:24,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:03:25,087 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-12-14 14:03:25,094 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:03:26,023 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4648#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:03:26,023 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:03:26,023 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:03:26,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [137, 128, 128] total 391 [2022-12-14 14:03:26,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155801992] [2022-12-14 14:03:26,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:03:26,024 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 392 states [2022-12-14 14:03:26,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:03:26,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 392 interpolants. [2022-12-14 14:03:26,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66248, Invalid=91758, Unknown=0, NotChecked=0, Total=158006 [2022-12-14 14:03:26,046 INFO L87 Difference]: Start difference. First operand 146 states and 148 transitions. Second operand has 392 states, 392 states have (on average 1.0178571428571428) internal successors, (399), 391 states have internal predecessors, (399), 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) [2022-12-14 14:03:44,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:03:44,737 INFO L93 Difference]: Finished difference Result 293 states and 425 transitions. [2022-12-14 14:03:44,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 266 states. [2022-12-14 14:03:44,738 INFO L78 Accepts]: Start accepts. Automaton has has 392 states, 392 states have (on average 1.0178571428571428) internal successors, (399), 391 states have internal predecessors, (399), 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 142 [2022-12-14 14:03:44,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:03:44,739 INFO L225 Difference]: With dead ends: 293 [2022-12-14 14:03:44,739 INFO L226 Difference]: Without dead ends: 275 [2022-12-14 14:03:44,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 524 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29528 ImplicationChecksByTransitivity, 53.7s TimeCoverageRelationStatistics Valid=100296, Invalid=175854, Unknown=0, NotChecked=0, Total=276150 [2022-12-14 14:03:44,751 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 646 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 1019 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 646 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 14:03:44,751 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 88 Invalid, 1019 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [646 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 14:03:44,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2022-12-14 14:03:44,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 275. [2022-12-14 14:03:44,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 271 states have (on average 1.011070110701107) internal successors, (274), 272 states have internal predecessors, (274), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 14:03:44,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 277 transitions. [2022-12-14 14:03:44,766 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 277 transitions. Word has length 142 [2022-12-14 14:03:44,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:03:44,766 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 277 transitions. [2022-12-14 14:03:44,766 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 392 states, 392 states have (on average 1.0178571428571428) internal successors, (399), 391 states have internal predecessors, (399), 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) [2022-12-14 14:03:44,766 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 277 transitions. [2022-12-14 14:03:44,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2022-12-14 14:03:44,769 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:03:44,769 INFO L195 NwaCegarLoop]: trace histogram [254, 10, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:03:44,774 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 14:03:44,969 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:03:44,971 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:03:44,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:03:44,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1815960655, now seen corresponding path program 8 times [2022-12-14 14:03:44,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:03:44,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234880198] [2022-12-14 14:03:44,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:03:44,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:03:45,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:05:36,864 INFO L134 CoverageAnalysis]: Checked inductivity of 32440 backedges. 0 proven. 32440 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:05:36,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:05:36,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234880198] [2022-12-14 14:05:36,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234880198] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:05:36,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161180545] [2022-12-14 14:05:36,864 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:05:36,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:05:36,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:05:36,865 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:05:36,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 14:05:36,959 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 14:05:36,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:05:36,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 14:05:36,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:05:37,944 INFO L134 CoverageAnalysis]: Checked inductivity of 32440 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 32385 trivial. 0 not checked. [2022-12-14 14:05:37,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:05:38,573 INFO L134 CoverageAnalysis]: Checked inductivity of 32440 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 32410 trivial. 0 not checked. [2022-12-14 14:05:38,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161180545] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:05:38,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [431610163] [2022-12-14 14:05:38,575 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:05:38,575 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:05:38,575 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:05:38,575 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:05:38,575 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:05:38,689 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-12-14 14:05:38,698 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:05:39,652 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7933#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:05:39,652 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:05:39,652 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:05:39,653 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [266, 14, 5] total 283 [2022-12-14 14:05:39,653 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68510463] [2022-12-14 14:05:39,653 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:05:39,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 284 states [2022-12-14 14:05:39,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:05:39,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 284 interpolants. [2022-12-14 14:05:39,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35588, Invalid=48222, Unknown=0, NotChecked=0, Total=83810 [2022-12-14 14:05:39,661 INFO L87 Difference]: Start difference. First operand 275 states and 277 transitions. Second operand has 284 states, 284 states have (on average 1.0352112676056338) internal successors, (294), 281 states have internal predecessors, (294), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:06:05,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:06:05,714 INFO L93 Difference]: Finished difference Result 291 states and 296 transitions. [2022-12-14 14:06:05,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 272 states. [2022-12-14 14:06:05,715 INFO L78 Accepts]: Start accepts. Automaton has has 284 states, 284 states have (on average 1.0352112676056338) internal successors, (294), 281 states have internal predecessors, (294), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 271 [2022-12-14 14:06:05,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:06:05,717 INFO L225 Difference]: With dead ends: 291 [2022-12-14 14:06:05,717 INFO L226 Difference]: Without dead ends: 283 [2022-12-14 14:06:05,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1343 GetRequests, 789 SyntacticMatches, 0 SemanticMatches, 554 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41910 ImplicationChecksByTransitivity, 44.6s TimeCoverageRelationStatistics Valid=104285, Invalid=204295, Unknown=0, NotChecked=0, Total=308580 [2022-12-14 14:06:05,729 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 14:06:05,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 100 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 562 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 14:06:05,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2022-12-14 14:06:05,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 282. [2022-12-14 14:06:05,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 276 states have (on average 1.0144927536231885) internal successors, (280), 278 states have internal predecessors, (280), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 14:06:05,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 285 transitions. [2022-12-14 14:06:05,751 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 285 transitions. Word has length 271 [2022-12-14 14:06:05,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:06:05,751 INFO L495 AbstractCegarLoop]: Abstraction has 282 states and 285 transitions. [2022-12-14 14:06:05,752 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 284 states, 284 states have (on average 1.0352112676056338) internal successors, (294), 281 states have internal predecessors, (294), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:06:05,752 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 285 transitions. [2022-12-14 14:06:05,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2022-12-14 14:06:05,756 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:06:05,756 INFO L195 NwaCegarLoop]: trace histogram [254, 11, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:06:05,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 14:06:05,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:06:05,958 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:06:05,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:06:05,959 INFO L85 PathProgramCache]: Analyzing trace with hash -417738215, now seen corresponding path program 9 times [2022-12-14 14:06:05,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:06:05,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835905667] [2022-12-14 14:06:05,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:06:05,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:06:06,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:07:57,305 INFO L134 CoverageAnalysis]: Checked inductivity of 32451 backedges. 0 proven. 32451 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:07:57,305 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:07:57,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835905667] [2022-12-14 14:07:57,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835905667] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:07:57,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396682525] [2022-12-14 14:07:57,306 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:07:57,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:07:57,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:07:57,307 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:07:57,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 14:07:57,507 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:07:57,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:07:57,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 256 conjunts are in the unsatisfiable core [2022-12-14 14:07:57,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:08:39,493 INFO L134 CoverageAnalysis]: Checked inductivity of 32451 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 14:08:39,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:10:05,525 INFO L134 CoverageAnalysis]: Checked inductivity of 32451 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 14:10:05,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396682525] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:10:05,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [613772595] [2022-12-14 14:10:05,527 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:10:05,527 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:10:05,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:10:05,527 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:10:05,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:10:05,628 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-12-14 14:10:05,634 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:10:07,260 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11998#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:10:07,261 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:10:07,261 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:10:07,261 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [267, 256, 256] total 777 [2022-12-14 14:10:07,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615344866] [2022-12-14 14:10:07,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:10:07,262 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 778 states [2022-12-14 14:10:07,262 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:10:07,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 778 interpolants. [2022-12-14 14:10:07,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264031, Invalid=349841, Unknown=0, NotChecked=0, Total=613872 [2022-12-14 14:10:07,323 INFO L87 Difference]: Start difference. First operand 282 states and 285 transitions. Second operand has 778 states, 778 states have (on average 1.0089974293059125) internal successors, (785), 777 states have internal predecessors, (785), 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) [2022-12-14 14:11:24,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:11:24,811 INFO L93 Difference]: Finished difference Result 565 states and 827 transitions. [2022-12-14 14:11:24,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 524 states. [2022-12-14 14:11:24,812 INFO L78 Accepts]: Start accepts. Automaton has has 778 states, 778 states have (on average 1.0089974293059125) internal successors, (785), 777 states have internal predecessors, (785), 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 272 [2022-12-14 14:11:24,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:11:24,815 INFO L225 Difference]: With dead ends: 565 [2022-12-14 14:11:24,816 INFO L226 Difference]: Without dead ends: 539 [2022-12-14 14:11:24,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1337 GetRequests, 299 SyntacticMatches, 0 SemanticMatches, 1038 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109218 ImplicationChecksByTransitivity, 213.3s TimeCoverageRelationStatistics Valid=398175, Invalid=682385, Unknown=0, NotChecked=0, Total=1080560 [2022-12-14 14:11:24,864 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 689 mSolverCounterSat, 515 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 1204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 515 IncrementalHoareTripleChecker+Valid, 689 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:11:24,865 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 88 Invalid, 1204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [515 Valid, 689 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 14:11:24,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 539 states. [2022-12-14 14:11:24,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 539 to 539. [2022-12-14 14:11:24,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 533 states have (on average 1.0075046904315197) internal successors, (537), 535 states have internal predecessors, (537), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 14:11:24,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 542 transitions. [2022-12-14 14:11:24,889 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 542 transitions. Word has length 272 [2022-12-14 14:11:24,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:11:24,890 INFO L495 AbstractCegarLoop]: Abstraction has 539 states and 542 transitions. [2022-12-14 14:11:24,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 778 states, 778 states have (on average 1.0089974293059125) internal successors, (785), 777 states have internal predecessors, (785), 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) [2022-12-14 14:11:24,890 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 542 transitions. [2022-12-14 14:11:24,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 531 [2022-12-14 14:11:24,897 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:11:24,897 INFO L195 NwaCegarLoop]: trace histogram [510, 13, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:11:24,904 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 14:11:25,098 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60fc0ee3-5d21-4ed1-aaec-a0ddc95e70a5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 14:11:25,099 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:11:25,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:11:25,100 INFO L85 PathProgramCache]: Analyzing trace with hash 884949209, now seen corresponding path program 10 times [2022-12-14 14:11:25,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:11:25,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706300031] [2022-12-14 14:11:25,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:11:25,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:11:25,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat