./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.14.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.14.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS --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 78a96934dff25285973ef889167a345947d7e73ab8a2ec405d96bd61e690530f --- 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-8393723 [2022-11-19 06:32:34,121 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 06:32:34,124 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 06:32:34,156 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 06:32:34,157 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 06:32:34,158 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 06:32:34,160 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 06:32:34,162 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 06:32:34,169 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 06:32:34,180 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 06:32:34,181 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 06:32:34,182 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 06:32:34,182 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 06:32:34,183 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 06:32:34,185 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 06:32:34,186 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 06:32:34,187 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 06:32:34,188 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 06:32:34,190 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 06:32:34,201 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 06:32:34,207 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 06:32:34,210 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 06:32:34,215 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 06:32:34,216 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 06:32:34,220 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 06:32:34,220 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 06:32:34,221 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 06:32:34,222 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 06:32:34,222 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 06:32:34,223 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 06:32:34,235 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 06:32:34,236 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 06:32:34,237 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 06:32:34,238 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 06:32:34,239 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 06:32:34,239 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 06:32:34,240 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 06:32:34,240 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 06:32:34,241 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 06:32:34,242 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 06:32:34,242 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 06:32:34,247 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 06:32:34,299 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 06:32:34,299 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 06:32:34,300 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 06:32:34,300 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 06:32:34,301 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 06:32:34,301 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 06:32:34,302 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 06:32:34,302 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 06:32:34,302 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 06:32:34,302 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 06:32:34,304 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 06:32:34,304 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 06:32:34,304 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 06:32:34,304 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 06:32:34,304 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 06:32:34,305 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 06:32:34,305 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 06:32:34,305 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 06:32:34,306 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 06:32:34,306 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 06:32:34,307 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 06:32:34,307 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 06:32:34,307 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 06:32:34,309 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 06:32:34,309 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 06:32:34,309 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 06:32:34,310 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 06:32:34,310 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 06:32:34,310 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 06:32:34,310 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 06:32:34,310 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 06:32:34,311 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 06:32:34,311 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:32:34,311 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 06:32:34,312 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 06:32:34,312 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 06:32:34,312 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 06:32:34,312 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 06:32:34,313 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 06:32:34,313 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 06:32:34,313 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 06:32:34,313 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_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 78a96934dff25285973ef889167a345947d7e73ab8a2ec405d96bd61e690530f [2022-11-19 06:32:34,674 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 06:32:34,700 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 06:32:34,703 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 06:32:34,705 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 06:32:34,706 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 06:32:34,708 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/systemc/token_ring.14.cil.c [2022-11-19 06:32:34,812 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/data/a589a569d/b877e9ebd0764849b9c7dfc3064d0bba/FLAG3e0a0655a [2022-11-19 06:32:35,542 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 06:32:35,543 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/sv-benchmarks/c/systemc/token_ring.14.cil.c [2022-11-19 06:32:35,559 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/data/a589a569d/b877e9ebd0764849b9c7dfc3064d0bba/FLAG3e0a0655a [2022-11-19 06:32:35,813 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/data/a589a569d/b877e9ebd0764849b9c7dfc3064d0bba [2022-11-19 06:32:35,823 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 06:32:35,826 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 06:32:35,834 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 06:32:35,834 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 06:32:35,839 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 06:32:35,840 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:32:35" (1/1) ... [2022-11-19 06:32:35,843 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ea0b025 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:35, skipping insertion in model container [2022-11-19 06:32:35,844 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:32:35" (1/1) ... [2022-11-19 06:32:35,853 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 06:32:35,929 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 06:32:36,121 WARN L234 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_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/sv-benchmarks/c/systemc/token_ring.14.cil.c[669,682] [2022-11-19 06:32:36,355 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:32:36,374 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 06:32:36,402 WARN L234 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_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/sv-benchmarks/c/systemc/token_ring.14.cil.c[669,682] [2022-11-19 06:32:36,489 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:32:36,510 INFO L208 MainTranslator]: Completed translation [2022-11-19 06:32:36,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36 WrapperNode [2022-11-19 06:32:36,511 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 06:32:36,512 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 06:32:36,512 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 06:32:36,512 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 06:32:36,524 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,551 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,639 INFO L138 Inliner]: procedures = 52, calls = 68, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 856 [2022-11-19 06:32:36,639 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 06:32:36,640 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 06:32:36,640 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 06:32:36,640 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 06:32:36,650 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,653 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,660 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,660 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,673 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,687 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,690 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,693 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,699 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 06:32:36,700 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 06:32:36,700 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 06:32:36,701 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 06:32:36,716 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (1/1) ... [2022-11-19 06:32:36,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:32:36,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:32:36,777 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 06:32:36,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 06:32:36,842 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 06:32:36,842 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2022-11-19 06:32:36,842 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2022-11-19 06:32:36,842 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-19 06:32:36,843 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-19 06:32:36,843 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2022-11-19 06:32:36,843 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2022-11-19 06:32:36,843 INFO L130 BoogieDeclarations]: Found specification of procedure error [2022-11-19 06:32:36,843 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2022-11-19 06:32:36,844 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2022-11-19 06:32:36,844 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2022-11-19 06:32:36,844 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2022-11-19 06:32:36,844 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2022-11-19 06:32:36,845 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2022-11-19 06:32:36,845 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2022-11-19 06:32:36,845 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 06:32:36,845 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 06:32:36,845 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 06:32:37,080 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 06:32:37,082 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 06:32:38,285 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 06:32:39,009 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 06:32:39,010 INFO L300 CfgBuilder]: Removed 15 assume(true) statements. [2022-11-19 06:32:39,017 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:32:39 BoogieIcfgContainer [2022-11-19 06:32:39,017 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 06:32:39,020 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 06:32:39,021 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 06:32:39,025 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 06:32:39,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 06:32:35" (1/3) ... [2022-11-19 06:32:39,026 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@175dfe75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:32:39, skipping insertion in model container [2022-11-19 06:32:39,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:32:36" (2/3) ... [2022-11-19 06:32:39,027 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@175dfe75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:32:39, skipping insertion in model container [2022-11-19 06:32:39,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:32:39" (3/3) ... [2022-11-19 06:32:39,031 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.14.cil.c [2022-11-19 06:32:39,056 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 06:32:39,056 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 06:32:39,164 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 06:32:39,171 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;@1fe3cf62, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 06:32:39,172 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 06:32:39,178 INFO L276 IsEmpty]: Start isEmpty. Operand has 194 states, 157 states have (on average 1.5668789808917198) internal successors, (246), 161 states have internal predecessors, (246), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2022-11-19 06:32:39,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-19 06:32:39,192 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:32:39,193 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:32:39,194 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:32:39,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:32:39,201 INFO L85 PathProgramCache]: Analyzing trace with hash 505210802, now seen corresponding path program 1 times [2022-11-19 06:32:39,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:32:39,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466355317] [2022-11-19 06:32:39,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:39,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:32:39,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:39,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:32:39,876 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:32:39,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466355317] [2022-11-19 06:32:39,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466355317] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:32:39,878 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:32:39,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 06:32:39,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166498509] [2022-11-19 06:32:39,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:32:39,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 06:32:39,886 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:32:39,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 06:32:39,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:32:39,931 INFO L87 Difference]: Start difference. First operand has 194 states, 157 states have (on average 1.5668789808917198) internal successors, (246), 161 states have internal predecessors, (246), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-19 06:32:40,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:32:40,749 INFO L93 Difference]: Finished difference Result 558 states and 902 transitions. [2022-11-19 06:32:40,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 06:32:40,753 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 67 [2022-11-19 06:32:40,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:32:40,771 INFO L225 Difference]: With dead ends: 558 [2022-11-19 06:32:40,779 INFO L226 Difference]: Without dead ends: 365 [2022-11-19 06:32:40,795 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:32:40,803 INFO L413 NwaCegarLoop]: 462 mSDtfsCounter, 516 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 516 SdHoareTripleChecker+Valid, 824 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:32:40,808 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [516 Valid, 824 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 06:32:40,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2022-11-19 06:32:40,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 364. [2022-11-19 06:32:40,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 301 states have (on average 1.521594684385382) internal successors, (458), 304 states have internal predecessors, (458), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2022-11-19 06:32:40,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 556 transitions. [2022-11-19 06:32:40,910 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 556 transitions. Word has length 67 [2022-11-19 06:32:40,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:32:40,911 INFO L495 AbstractCegarLoop]: Abstraction has 364 states and 556 transitions. [2022-11-19 06:32:40,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-19 06:32:40,912 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 556 transitions. [2022-11-19 06:32:40,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-19 06:32:40,921 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:32:40,921 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:32:40,922 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 06:32:40,922 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:32:40,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:32:40,923 INFO L85 PathProgramCache]: Analyzing trace with hash 1004924443, now seen corresponding path program 1 times [2022-11-19 06:32:40,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:32:40,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971174654] [2022-11-19 06:32:40,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:40,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:32:40,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:41,387 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 06:32:41,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:32:41,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971174654] [2022-11-19 06:32:41,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971174654] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:32:41,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109562398] [2022-11-19 06:32:41,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:41,389 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:41,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:32:41,393 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:32:41,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 06:32:41,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:41,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:32:41,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:32:41,990 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-19 06:32:41,992 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:32:41,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109562398] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:32:41,998 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:32:41,999 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 06:32:42,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824378190] [2022-11-19 06:32:42,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:32:42,004 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:32:42,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:32:42,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:32:42,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:42,008 INFO L87 Difference]: Start difference. First operand 364 states and 556 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:42,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:32:42,285 INFO L93 Difference]: Finished difference Result 1075 states and 1671 transitions. [2022-11-19 06:32:42,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:32:42,286 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2022-11-19 06:32:42,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:32:42,300 INFO L225 Difference]: With dead ends: 1075 [2022-11-19 06:32:42,300 INFO L226 Difference]: Without dead ends: 716 [2022-11-19 06:32:42,302 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:42,304 INFO L413 NwaCegarLoop]: 304 mSDtfsCounter, 248 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 537 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:32:42,306 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 537 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:32:42,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 716 states. [2022-11-19 06:32:42,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 716 to 710. [2022-11-19 06:32:42,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 710 states, 593 states have (on average 1.5193929173693086) internal successors, (901), 597 states have internal predecessors, (901), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2022-11-19 06:32:42,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 710 states to 710 states and 1083 transitions. [2022-11-19 06:32:42,425 INFO L78 Accepts]: Start accepts. Automaton has 710 states and 1083 transitions. Word has length 136 [2022-11-19 06:32:42,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:32:42,426 INFO L495 AbstractCegarLoop]: Abstraction has 710 states and 1083 transitions. [2022-11-19 06:32:42,427 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:42,427 INFO L276 IsEmpty]: Start isEmpty. Operand 710 states and 1083 transitions. [2022-11-19 06:32:42,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-19 06:32:42,454 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:32:42,455 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:32:42,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 06:32:42,665 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:42,666 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:32:42,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:32:42,670 INFO L85 PathProgramCache]: Analyzing trace with hash 1033810683, now seen corresponding path program 1 times [2022-11-19 06:32:42,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:32:42,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988090951] [2022-11-19 06:32:42,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:42,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:32:42,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:43,082 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 06:32:43,083 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:32:43,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988090951] [2022-11-19 06:32:43,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988090951] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:32:43,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761975543] [2022-11-19 06:32:43,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:43,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:43,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:32:43,092 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:32:43,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 06:32:43,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:43,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 993 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:32:43,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:32:43,481 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-19 06:32:43,481 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:32:43,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [761975543] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:32:43,481 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:32:43,481 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 06:32:43,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201424522] [2022-11-19 06:32:43,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:32:43,482 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:32:43,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:32:43,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:32:43,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:43,484 INFO L87 Difference]: Start difference. First operand 710 states and 1083 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:43,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:32:43,769 INFO L93 Difference]: Finished difference Result 2107 states and 3270 transitions. [2022-11-19 06:32:43,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:32:43,770 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2022-11-19 06:32:43,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:32:43,779 INFO L225 Difference]: With dead ends: 2107 [2022-11-19 06:32:43,779 INFO L226 Difference]: Without dead ends: 1402 [2022-11-19 06:32:43,782 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:43,784 INFO L413 NwaCegarLoop]: 303 mSDtfsCounter, 260 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 536 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:32:43,784 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [260 Valid, 536 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:32:43,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1402 states. [2022-11-19 06:32:43,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1402 to 1394. [2022-11-19 06:32:43,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1394 states, 1171 states have (on average 1.515798462852263) internal successors, (1775), 1177 states have internal predecessors, (1775), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2022-11-19 06:32:43,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1394 states to 1394 states and 2121 transitions. [2022-11-19 06:32:43,895 INFO L78 Accepts]: Start accepts. Automaton has 1394 states and 2121 transitions. Word has length 136 [2022-11-19 06:32:43,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:32:43,896 INFO L495 AbstractCegarLoop]: Abstraction has 1394 states and 2121 transitions. [2022-11-19 06:32:43,896 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:43,896 INFO L276 IsEmpty]: Start isEmpty. Operand 1394 states and 2121 transitions. [2022-11-19 06:32:43,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-19 06:32:43,902 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:32:43,902 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:32:43,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 06:32:44,110 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:44,111 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:32:44,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:32:44,111 INFO L85 PathProgramCache]: Analyzing trace with hash 1861691355, now seen corresponding path program 1 times [2022-11-19 06:32:44,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:32:44,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144394357] [2022-11-19 06:32:44,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:44,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:32:44,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:44,371 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 06:32:44,371 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:32:44,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144394357] [2022-11-19 06:32:44,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144394357] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:32:44,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509180456] [2022-11-19 06:32:44,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:44,376 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:44,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:32:44,377 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:32:44,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 06:32:44,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:44,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:32:44,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:32:44,860 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-19 06:32:44,860 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:32:44,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509180456] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:32:44,861 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:32:44,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 06:32:44,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609822830] [2022-11-19 06:32:44,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:32:44,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:32:44,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:32:44,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:32:44,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:44,864 INFO L87 Difference]: Start difference. First operand 1394 states and 2121 transitions. Second operand has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:45,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:32:45,174 INFO L93 Difference]: Finished difference Result 4147 states and 6418 transitions. [2022-11-19 06:32:45,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:32:45,179 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2022-11-19 06:32:45,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:32:45,197 INFO L225 Difference]: With dead ends: 4147 [2022-11-19 06:32:45,197 INFO L226 Difference]: Without dead ends: 2758 [2022-11-19 06:32:45,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:45,205 INFO L413 NwaCegarLoop]: 263 mSDtfsCounter, 242 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:32:45,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [242 Valid, 496 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:32:45,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2758 states. [2022-11-19 06:32:45,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2758 to 2746. [2022-11-19 06:32:45,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2746 states, 2315 states have (on average 1.5114470842332612) internal successors, (3499), 2325 states have internal predecessors, (3499), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2022-11-19 06:32:45,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2746 states to 2746 states and 4165 transitions. [2022-11-19 06:32:45,430 INFO L78 Accepts]: Start accepts. Automaton has 2746 states and 4165 transitions. Word has length 136 [2022-11-19 06:32:45,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:32:45,431 INFO L495 AbstractCegarLoop]: Abstraction has 2746 states and 4165 transitions. [2022-11-19 06:32:45,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:45,431 INFO L276 IsEmpty]: Start isEmpty. Operand 2746 states and 4165 transitions. [2022-11-19 06:32:45,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-19 06:32:45,440 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:32:45,440 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:32:45,454 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 06:32:45,648 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:45,648 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:32:45,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:32:45,649 INFO L85 PathProgramCache]: Analyzing trace with hash 1214059707, now seen corresponding path program 1 times [2022-11-19 06:32:45,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:32:45,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436511916] [2022-11-19 06:32:45,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:45,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:32:45,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:45,872 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 06:32:45,873 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:32:45,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436511916] [2022-11-19 06:32:45,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436511916] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:32:45,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674871624] [2022-11-19 06:32:45,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:45,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:45,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:32:45,876 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:32:45,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 06:32:46,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:46,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 981 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:32:46,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:32:46,335 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 06:32:46,335 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:32:46,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674871624] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:32:46,336 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:32:46,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 06:32:46,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790353258] [2022-11-19 06:32:46,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:32:46,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:32:46,338 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:32:46,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:32:46,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:46,339 INFO L87 Difference]: Start difference. First operand 2746 states and 4165 transitions. Second operand has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:46,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:32:46,793 INFO L93 Difference]: Finished difference Result 8179 states and 12614 transitions. [2022-11-19 06:32:46,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:32:46,794 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2022-11-19 06:32:46,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:32:46,828 INFO L225 Difference]: With dead ends: 8179 [2022-11-19 06:32:46,828 INFO L226 Difference]: Without dead ends: 5438 [2022-11-19 06:32:46,840 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:46,841 INFO L413 NwaCegarLoop]: 263 mSDtfsCounter, 239 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:32:46,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 496 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:32:46,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5438 states. [2022-11-19 06:32:47,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5438 to 5418. [2022-11-19 06:32:47,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5418 states, 4579 states have (on average 1.5066608429788164) internal successors, (6899), 4597 states have internal predecessors, (6899), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2022-11-19 06:32:47,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5418 states to 5418 states and 8189 transitions. [2022-11-19 06:32:47,263 INFO L78 Accepts]: Start accepts. Automaton has 5418 states and 8189 transitions. Word has length 136 [2022-11-19 06:32:47,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:32:47,265 INFO L495 AbstractCegarLoop]: Abstraction has 5418 states and 8189 transitions. [2022-11-19 06:32:47,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:47,266 INFO L276 IsEmpty]: Start isEmpty. Operand 5418 states and 8189 transitions. [2022-11-19 06:32:47,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-19 06:32:47,278 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:32:47,278 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:32:47,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 06:32:47,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:47,486 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:32:47,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:32:47,487 INFO L85 PathProgramCache]: Analyzing trace with hash -399944741, now seen corresponding path program 1 times [2022-11-19 06:32:47,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:32:47,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834426221] [2022-11-19 06:32:47,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:47,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:32:47,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:47,801 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 06:32:47,801 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:32:47,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834426221] [2022-11-19 06:32:47,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834426221] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:32:47,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177324797] [2022-11-19 06:32:47,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:47,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:47,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:32:47,804 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:32:47,828 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 06:32:48,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:48,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 975 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:32:48,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:32:48,161 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-19 06:32:48,161 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:32:48,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177324797] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:32:48,162 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:32:48,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 06:32:48,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023964984] [2022-11-19 06:32:48,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:32:48,163 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:32:48,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:32:48,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:32:48,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:48,165 INFO L87 Difference]: Start difference. First operand 5418 states and 8189 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:48,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:32:48,946 INFO L93 Difference]: Finished difference Result 16147 states and 24806 transitions. [2022-11-19 06:32:48,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:32:48,947 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2022-11-19 06:32:48,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:32:49,017 INFO L225 Difference]: With dead ends: 16147 [2022-11-19 06:32:49,018 INFO L226 Difference]: Without dead ends: 10734 [2022-11-19 06:32:49,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:49,047 INFO L413 NwaCegarLoop]: 289 mSDtfsCounter, 266 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 522 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:32:49,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [266 Valid, 522 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:32:49,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10734 states. [2022-11-19 06:32:49,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10734 to 10698. [2022-11-19 06:32:49,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10698 states, 9059 states have (on average 1.5016006181697759) internal successors, (13603), 9093 states have internal predecessors, (13603), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2022-11-19 06:32:49,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10698 states to 10698 states and 16109 transitions. [2022-11-19 06:32:49,854 INFO L78 Accepts]: Start accepts. Automaton has 10698 states and 16109 transitions. Word has length 136 [2022-11-19 06:32:49,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:32:49,857 INFO L495 AbstractCegarLoop]: Abstraction has 10698 states and 16109 transitions. [2022-11-19 06:32:49,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:49,858 INFO L276 IsEmpty]: Start isEmpty. Operand 10698 states and 16109 transitions. [2022-11-19 06:32:49,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-19 06:32:49,882 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:32:49,883 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:32:49,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 06:32:50,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 06:32:50,092 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:32:50,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:32:50,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1406050491, now seen corresponding path program 1 times [2022-11-19 06:32:50,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:32:50,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391238040] [2022-11-19 06:32:50,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:50,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:32:50,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:50,412 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 06:32:50,412 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:32:50,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391238040] [2022-11-19 06:32:50,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [391238040] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:32:50,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435946752] [2022-11-19 06:32:50,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:50,413 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:50,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:32:50,415 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:32:50,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 06:32:50,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:50,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 969 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:32:50,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:32:50,801 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-19 06:32:50,801 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:32:50,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435946752] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:32:50,802 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:32:50,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 06:32:50,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728346325] [2022-11-19 06:32:50,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:32:50,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:32:50,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:32:50,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:32:50,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:50,805 INFO L87 Difference]: Start difference. First operand 10698 states and 16109 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:52,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:32:52,240 INFO L93 Difference]: Finished difference Result 31891 states and 48790 transitions. [2022-11-19 06:32:52,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:32:52,241 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2022-11-19 06:32:52,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:32:52,408 INFO L225 Difference]: With dead ends: 31891 [2022-11-19 06:32:52,409 INFO L226 Difference]: Without dead ends: 21198 [2022-11-19 06:32:52,478 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:52,479 INFO L413 NwaCegarLoop]: 299 mSDtfsCounter, 269 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 532 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 06:32:52,479 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [269 Valid, 532 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 06:32:52,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21198 states. [2022-11-19 06:32:53,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21198 to 21130. [2022-11-19 06:32:53,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21130 states, 17923 states have (on average 1.4963454778775875) internal successors, (26819), 17989 states have internal predecessors, (26819), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2022-11-19 06:32:54,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21130 states to 21130 states and 31693 transitions. [2022-11-19 06:32:54,068 INFO L78 Accepts]: Start accepts. Automaton has 21130 states and 31693 transitions. Word has length 136 [2022-11-19 06:32:54,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:32:54,069 INFO L495 AbstractCegarLoop]: Abstraction has 21130 states and 31693 transitions. [2022-11-19 06:32:54,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:54,070 INFO L276 IsEmpty]: Start isEmpty. Operand 21130 states and 31693 transitions. [2022-11-19 06:32:54,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-19 06:32:54,112 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:32:54,112 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:32:54,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 06:32:54,320 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:54,321 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:32:54,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:32:54,322 INFO L85 PathProgramCache]: Analyzing trace with hash 754690011, now seen corresponding path program 1 times [2022-11-19 06:32:54,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:32:54,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895936327] [2022-11-19 06:32:54,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:54,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:32:54,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:54,538 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 06:32:54,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:32:54,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895936327] [2022-11-19 06:32:54,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895936327] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:32:54,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357299728] [2022-11-19 06:32:54,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:32:54,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:32:54,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:32:54,542 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:32:54,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 06:32:54,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:32:54,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:32:54,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:32:54,938 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-19 06:32:54,939 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:32:54,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [357299728] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:32:54,939 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:32:54,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 06:32:54,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695181460] [2022-11-19 06:32:54,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:32:54,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:32:54,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:32:54,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:32:54,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:54,947 INFO L87 Difference]: Start difference. First operand 21130 states and 31693 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:32:57,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:32:57,592 INFO L93 Difference]: Finished difference Result 62995 states and 95958 transitions. [2022-11-19 06:32:57,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:32:57,593 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2022-11-19 06:32:57,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:32:58,040 INFO L225 Difference]: With dead ends: 62995 [2022-11-19 06:32:58,040 INFO L226 Difference]: Without dead ends: 41870 [2022-11-19 06:32:58,097 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:32:58,098 INFO L413 NwaCegarLoop]: 263 mSDtfsCounter, 254 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 06:32:58,098 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 496 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 06:32:58,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41870 states. [2022-11-19 06:33:00,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41870 to 41738. [2022-11-19 06:33:00,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41738 states, 35459 states have (on average 1.490933190445303) internal successors, (52867), 35589 states have internal predecessors, (52867), 4742 states have call successors, (4742), 1537 states have call predecessors, (4742), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2022-11-19 06:33:01,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41738 states to 41738 states and 62349 transitions. [2022-11-19 06:33:01,019 INFO L78 Accepts]: Start accepts. Automaton has 41738 states and 62349 transitions. Word has length 136 [2022-11-19 06:33:01,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:33:01,020 INFO L495 AbstractCegarLoop]: Abstraction has 41738 states and 62349 transitions. [2022-11-19 06:33:01,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-19 06:33:01,020 INFO L276 IsEmpty]: Start isEmpty. Operand 41738 states and 62349 transitions. [2022-11-19 06:33:01,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-19 06:33:01,097 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:33:01,097 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:33:01,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 06:33:01,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:33:01,306 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:33:01,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:33:01,306 INFO L85 PathProgramCache]: Analyzing trace with hash -1819982661, now seen corresponding path program 1 times [2022-11-19 06:33:01,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:33:01,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73838959] [2022-11-19 06:33:01,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:33:01,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:33:01,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:33:02,384 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-19 06:33:02,385 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:33:02,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73838959] [2022-11-19 06:33:02,385 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [73838959] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:33:02,385 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:33:02,386 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-19 06:33:02,386 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918284442] [2022-11-19 06:33:02,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:33:02,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 06:33:02,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:33:02,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 06:33:02,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:33:02,388 INFO L87 Difference]: Start difference. First operand 41738 states and 62349 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-19 06:33:08,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:33:08,588 INFO L93 Difference]: Finished difference Result 145938 states and 217620 transitions. [2022-11-19 06:33:08,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 06:33:08,589 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 136 [2022-11-19 06:33:08,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:33:09,591 INFO L225 Difference]: With dead ends: 145938 [2022-11-19 06:33:09,592 INFO L226 Difference]: Without dead ends: 104206 [2022-11-19 06:33:09,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-19 06:33:09,713 INFO L413 NwaCegarLoop]: 263 mSDtfsCounter, 1087 mSDsluCounter, 608 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1108 SdHoareTripleChecker+Valid, 871 SdHoareTripleChecker+Invalid, 527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 06:33:09,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1108 Valid, 871 Invalid, 527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 06:33:09,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104206 states. [2022-11-19 06:33:14,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104206 to 81930. [2022-11-19 06:33:14,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81930 states, 69635 states have (on average 1.485273210310907) internal successors, (103427), 69893 states have internal predecessors, (103427), 9222 states have call successors, (9222), 3073 states have call predecessors, (9222), 3072 states have return successors, (9220), 8964 states have call predecessors, (9220), 9220 states have call successors, (9220) [2022-11-19 06:33:15,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81930 states to 81930 states and 121869 transitions. [2022-11-19 06:33:15,428 INFO L78 Accepts]: Start accepts. Automaton has 81930 states and 121869 transitions. Word has length 136 [2022-11-19 06:33:15,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:33:15,429 INFO L495 AbstractCegarLoop]: Abstraction has 81930 states and 121869 transitions. [2022-11-19 06:33:15,430 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-19 06:33:15,430 INFO L276 IsEmpty]: Start isEmpty. Operand 81930 states and 121869 transitions. [2022-11-19 06:33:15,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2022-11-19 06:33:15,587 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:33:15,588 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:33:15,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-19 06:33:15,588 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:33:15,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:33:15,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1660138999, now seen corresponding path program 1 times [2022-11-19 06:33:15,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:33:15,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081476010] [2022-11-19 06:33:15,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:33:15,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:33:15,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:33:16,434 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-19 06:33:16,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:33:16,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081476010] [2022-11-19 06:33:16,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081476010] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:33:16,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800767569] [2022-11-19 06:33:16,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:33:16,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:33:16,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:33:16,439 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:33:16,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 06:33:16,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:33:16,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:33:16,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:33:16,798 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2022-11-19 06:33:16,798 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:33:16,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800767569] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:33:16,799 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:33:16,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-19 06:33:16,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328056885] [2022-11-19 06:33:16,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:33:16,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:33:16,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:33:16,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:33:16,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 06:33:16,801 INFO L87 Difference]: Start difference. First operand 81930 states and 121869 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-19 06:33:21,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:33:21,160 INFO L93 Difference]: Finished difference Result 145550 states and 220304 transitions. [2022-11-19 06:33:21,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:33:21,161 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 158 [2022-11-19 06:33:21,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:33:21,878 INFO L225 Difference]: With dead ends: 145550 [2022-11-19 06:33:21,878 INFO L226 Difference]: Without dead ends: 103562 [2022-11-19 06:33:21,999 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 06:33:22,000 INFO L413 NwaCegarLoop]: 373 mSDtfsCounter, 125 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 628 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:33:22,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 628 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:33:22,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103562 states. [2022-11-19 06:33:27,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103562 to 97674. [2022-11-19 06:33:27,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97674 states, 84867 states have (on average 1.5293930503022377) internal successors, (129795), 85125 states have internal predecessors, (129795), 9478 states have call successors, (9478), 3329 states have call predecessors, (9478), 3328 states have return successors, (9476), 9220 states have call predecessors, (9476), 9476 states have call successors, (9476) [2022-11-19 06:33:27,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97674 states to 97674 states and 148749 transitions. [2022-11-19 06:33:27,886 INFO L78 Accepts]: Start accepts. Automaton has 97674 states and 148749 transitions. Word has length 158 [2022-11-19 06:33:27,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:33:27,887 INFO L495 AbstractCegarLoop]: Abstraction has 97674 states and 148749 transitions. [2022-11-19 06:33:27,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-19 06:33:27,887 INFO L276 IsEmpty]: Start isEmpty. Operand 97674 states and 148749 transitions. [2022-11-19 06:33:28,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2022-11-19 06:33:28,161 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:33:28,161 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:33:28,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 06:33:28,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 06:33:28,381 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:33:28,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:33:28,382 INFO L85 PathProgramCache]: Analyzing trace with hash 1122018212, now seen corresponding path program 1 times [2022-11-19 06:33:28,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:33:28,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890964490] [2022-11-19 06:33:28,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:33:28,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:33:28,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:33:28,903 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2022-11-19 06:33:28,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:33:28,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890964490] [2022-11-19 06:33:28,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [890964490] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:33:28,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505262630] [2022-11-19 06:33:28,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:33:28,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:33:28,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:33:28,906 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:33:28,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91792a20-3f9b-43b8-a9c3-7e760b5c1a11/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 06:33:29,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:33:29,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 1262 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:33:29,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:33:29,577 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-19 06:33:29,578 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:33:29,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505262630] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:33:29,578 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:33:29,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2022-11-19 06:33:29,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618064391] [2022-11-19 06:33:29,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:33:29,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:33:29,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:33:29,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:33:29,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 06:33:29,582 INFO L87 Difference]: Start difference. First operand 97674 states and 148749 transitions. Second operand has 3 states, 3 states have (on average 44.333333333333336) internal successors, (133), 2 states have internal predecessors, (133), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10)