./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-linux-3.12-rc1/linux-3.12-rc1.tar.xz-144_2a-drivers--net--can--usb--usb_8dev.ko-entry_point.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-linux-3.12-rc1/linux-3.12-rc1.tar.xz-144_2a-drivers--net--can--usb--usb_8dev.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW --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 64bit --witnessprinter.graph.data.programhash 83293f5c81ac30df7449dd9c03263a4edbba62be916a9a4fda92d2518792b8d4 --- 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-4e7fbc6 [2022-11-23 15:46:59,124 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 15:46:59,127 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 15:46:59,163 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 15:46:59,163 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 15:46:59,164 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 15:46:59,166 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 15:46:59,174 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 15:46:59,176 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 15:46:59,177 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 15:46:59,178 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 15:46:59,179 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 15:46:59,179 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 15:46:59,180 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 15:46:59,181 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 15:46:59,183 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 15:46:59,183 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 15:46:59,184 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 15:46:59,186 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 15:46:59,188 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 15:46:59,189 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 15:46:59,191 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 15:46:59,192 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 15:46:59,193 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 15:46:59,197 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 15:46:59,197 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 15:46:59,198 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 15:46:59,199 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 15:46:59,199 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 15:46:59,200 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 15:46:59,200 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 15:46:59,201 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 15:46:59,202 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 15:46:59,203 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 15:46:59,204 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 15:46:59,204 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 15:46:59,205 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 15:46:59,206 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 15:46:59,206 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 15:46:59,207 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 15:46:59,208 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 15:46:59,209 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-64bit-Taipan_Default.epf [2022-11-23 15:46:59,234 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 15:46:59,235 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 15:46:59,235 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 15:46:59,235 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 15:46:59,236 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 15:46:59,236 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 15:46:59,237 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 15:46:59,237 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 15:46:59,237 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 15:46:59,237 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 15:46:59,238 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 15:46:59,238 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 15:46:59,238 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 15:46:59,238 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 15:46:59,239 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 15:46:59,239 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 15:46:59,239 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 15:46:59,239 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 15:46:59,240 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 15:46:59,240 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 15:46:59,240 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 15:46:59,241 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 15:46:59,241 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 15:46:59,241 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 15:46:59,241 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 15:46:59,242 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 15:46:59,242 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 15:46:59,242 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 15:46:59,242 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 15:46:59,242 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 15:46:59,243 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 15:46:59,243 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 15:46:59,243 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 15:46:59,243 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 15:46:59,244 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 15:46:59,244 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 15:46:59,244 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 15:46:59,244 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 15:46:59,244 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_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 83293f5c81ac30df7449dd9c03263a4edbba62be916a9a4fda92d2518792b8d4 [2022-11-23 15:46:59,515 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 15:46:59,547 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 15:46:59,549 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 15:46:59,551 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 15:46:59,551 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 15:46:59,552 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/ldv-linux-3.12-rc1/linux-3.12-rc1.tar.xz-144_2a-drivers--net--can--usb--usb_8dev.ko-entry_point.cil.out.i [2022-11-23 15:47:02,617 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 15:47:03,134 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 15:47:03,135 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/sv-benchmarks/c/ldv-linux-3.12-rc1/linux-3.12-rc1.tar.xz-144_2a-drivers--net--can--usb--usb_8dev.ko-entry_point.cil.out.i [2022-11-23 15:47:03,164 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/data/1d0417b77/d82106f6099748689cab1263201412e8/FLAGcdc7cfc0d [2022-11-23 15:47:03,181 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/data/1d0417b77/d82106f6099748689cab1263201412e8 [2022-11-23 15:47:03,187 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 15:47:03,189 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 15:47:03,193 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 15:47:03,193 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 15:47:03,197 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 15:47:03,198 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:47:03" (1/1) ... [2022-11-23 15:47:03,199 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40dae88e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:03, skipping insertion in model container [2022-11-23 15:47:03,199 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:47:03" (1/1) ... [2022-11-23 15:47:03,207 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 15:47:03,392 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 15:47:04,257 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/sv-benchmarks/c/ldv-linux-3.12-rc1/linux-3.12-rc1.tar.xz-144_2a-drivers--net--can--usb--usb_8dev.ko-entry_point.cil.out.i[163669,163682] [2022-11-23 15:47:04,652 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 15:47:04,678 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 15:47:04,859 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/sv-benchmarks/c/ldv-linux-3.12-rc1/linux-3.12-rc1.tar.xz-144_2a-drivers--net--can--usb--usb_8dev.ko-entry_point.cil.out.i[163669,163682] [2022-11-23 15:47:05,023 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 15:47:05,099 INFO L208 MainTranslator]: Completed translation [2022-11-23 15:47:05,099 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05 WrapperNode [2022-11-23 15:47:05,100 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 15:47:05,101 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 15:47:05,101 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 15:47:05,101 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 15:47:05,109 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,181 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,260 INFO L138 Inliner]: procedures = 175, calls = 797, calls flagged for inlining = 84, calls inlined = 84, statements flattened = 2193 [2022-11-23 15:47:05,261 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 15:47:05,262 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 15:47:05,262 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 15:47:05,262 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 15:47:05,271 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,272 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,351 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,351 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,428 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,446 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,472 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,481 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,516 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 15:47:05,517 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 15:47:05,517 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 15:47:05,517 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 15:47:05,518 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (1/1) ... [2022-11-23 15:47:05,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 15:47:05,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:47:05,553 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 15:47:05,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 15:47:05,602 INFO L130 BoogieDeclarations]: Found specification of procedure atomic_set [2022-11-23 15:47:05,602 INFO L138 BoogieDeclarations]: Found implementation of procedure atomic_set [2022-11-23 15:47:05,602 INFO L130 BoogieDeclarations]: Found specification of procedure __fswab32 [2022-11-23 15:47:05,602 INFO L138 BoogieDeclarations]: Found implementation of procedure __fswab32 [2022-11-23 15:47:05,603 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_usb_fill_bulk_urb_2 [2022-11-23 15:47:05,603 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_usb_fill_bulk_urb_2 [2022-11-23 15:47:05,603 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_usb_set_intfdata_15 [2022-11-23 15:47:05,603 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_usb_set_intfdata_15 [2022-11-23 15:47:05,603 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2022-11-23 15:47:05,603 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_usb_submit_urb_3 [2022-11-23 15:47:05,603 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_usb_submit_urb_3 [2022-11-23 15:47:05,604 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2022-11-23 15:47:05,604 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2022-11-23 15:47:05,604 INFO L130 BoogieDeclarations]: Found specification of procedure usb_bulk_msg [2022-11-23 15:47:05,604 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_bulk_msg [2022-11-23 15:47:05,604 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2022-11-23 15:47:05,604 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2022-11-23 15:47:05,605 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-23 15:47:05,605 INFO L130 BoogieDeclarations]: Found specification of procedure netif_tx_start_queue [2022-11-23 15:47:05,605 INFO L138 BoogieDeclarations]: Found implementation of procedure netif_tx_start_queue [2022-11-23 15:47:05,605 INFO L130 BoogieDeclarations]: Found specification of procedure netif_device_present [2022-11-23 15:47:05,605 INFO L138 BoogieDeclarations]: Found implementation of procedure netif_device_present [2022-11-23 15:47:05,605 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_submit_urb [2022-11-23 15:47:05,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_submit_urb [2022-11-23 15:47:05,606 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memcpy [2022-11-23 15:47:05,607 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memcpy [2022-11-23 15:47:05,607 INFO L130 BoogieDeclarations]: Found specification of procedure __create_pipe [2022-11-23 15:47:05,608 INFO L138 BoogieDeclarations]: Found implementation of procedure __create_pipe [2022-11-23 15:47:05,608 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2022-11-23 15:47:05,608 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2022-11-23 15:47:05,609 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_alloc_urb [2022-11-23 15:47:05,609 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_alloc_urb [2022-11-23 15:47:05,609 INFO L130 BoogieDeclarations]: Found specification of procedure usb_8dev_read_bulk_callback [2022-11-23 15:47:05,609 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_8dev_read_bulk_callback [2022-11-23 15:47:05,609 INFO L130 BoogieDeclarations]: Found specification of procedure usb_kill_anchored_urbs [2022-11-23 15:47:05,609 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_kill_anchored_urbs [2022-11-23 15:47:05,610 INFO L130 BoogieDeclarations]: Found specification of procedure init_usb_anchor [2022-11-23 15:47:05,610 INFO L138 BoogieDeclarations]: Found implementation of procedure init_usb_anchor [2022-11-23 15:47:05,610 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-23 15:47:05,610 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2022-11-23 15:47:05,610 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2022-11-23 15:47:05,611 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2022-11-23 15:47:05,611 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2022-11-23 15:47:05,611 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2022-11-23 15:47:05,611 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2022-11-23 15:47:05,611 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-23 15:47:05,611 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-23 15:47:05,612 INFO L130 BoogieDeclarations]: Found specification of procedure netif_stop_queue [2022-11-23 15:47:05,612 INFO L138 BoogieDeclarations]: Found implementation of procedure netif_stop_queue [2022-11-23 15:47:05,612 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-23 15:47:05,613 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop___0 [2022-11-23 15:47:05,613 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop___0 [2022-11-23 15:47:05,614 INFO L130 BoogieDeclarations]: Found specification of procedure unlink_all_urbs [2022-11-23 15:47:05,614 INFO L138 BoogieDeclarations]: Found implementation of procedure unlink_all_urbs [2022-11-23 15:47:05,614 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 15:47:05,614 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_undef_int [2022-11-23 15:47:05,615 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_undef_int [2022-11-23 15:47:05,615 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-23 15:47:05,615 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-23 15:47:05,615 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~TO~VOID [2022-11-23 15:47:05,616 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~TO~VOID [2022-11-23 15:47:05,616 INFO L130 BoogieDeclarations]: Found specification of procedure usb_free_coherent [2022-11-23 15:47:05,616 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_free_coherent [2022-11-23 15:47:05,616 INFO L130 BoogieDeclarations]: Found specification of procedure usb_alloc_coherent [2022-11-23 15:47:05,616 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_alloc_coherent [2022-11-23 15:47:05,616 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-23 15:47:05,616 INFO L130 BoogieDeclarations]: Found specification of procedure atomic_dec [2022-11-23 15:47:05,617 INFO L138 BoogieDeclarations]: Found implementation of procedure atomic_dec [2022-11-23 15:47:05,617 INFO L130 BoogieDeclarations]: Found specification of procedure netif_rx [2022-11-23 15:47:05,617 INFO L138 BoogieDeclarations]: Found implementation of procedure netif_rx [2022-11-23 15:47:05,617 INFO L130 BoogieDeclarations]: Found specification of procedure usb_anchor_urb [2022-11-23 15:47:05,617 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_anchor_urb [2022-11-23 15:47:05,618 INFO L130 BoogieDeclarations]: Found specification of procedure can_led_event [2022-11-23 15:47:05,618 INFO L138 BoogieDeclarations]: Found implementation of procedure can_led_event [2022-11-23 15:47:05,618 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-23 15:47:05,619 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-11-23 15:47:05,619 INFO L130 BoogieDeclarations]: Found specification of procedure usb_8dev_disconnect [2022-11-23 15:47:05,620 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_8dev_disconnect [2022-11-23 15:47:05,620 INFO L130 BoogieDeclarations]: Found specification of procedure netif_device_detach [2022-11-23 15:47:05,620 INFO L138 BoogieDeclarations]: Found implementation of procedure netif_device_detach [2022-11-23 15:47:05,620 INFO L130 BoogieDeclarations]: Found specification of procedure netdev_priv [2022-11-23 15:47:05,620 INFO L138 BoogieDeclarations]: Found implementation of procedure netdev_priv [2022-11-23 15:47:05,621 INFO L130 BoogieDeclarations]: Found specification of procedure usb_unanchor_urb [2022-11-23 15:47:05,621 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_unanchor_urb [2022-11-23 15:47:05,621 INFO L130 BoogieDeclarations]: Found specification of procedure netdev_get_tx_queue [2022-11-23 15:47:05,622 INFO L138 BoogieDeclarations]: Found implementation of procedure netdev_get_tx_queue [2022-11-23 15:47:05,622 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_free_urb [2022-11-23 15:47:05,622 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_free_urb [2022-11-23 15:47:05,622 INFO L130 BoogieDeclarations]: Found specification of procedure close_candev [2022-11-23 15:47:05,622 INFO L138 BoogieDeclarations]: Found implementation of procedure close_candev [2022-11-23 15:47:05,622 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 15:47:05,623 INFO L130 BoogieDeclarations]: Found specification of procedure free_candev [2022-11-23 15:47:05,623 INFO L138 BoogieDeclarations]: Found implementation of procedure free_candev [2022-11-23 15:47:05,623 INFO L130 BoogieDeclarations]: Found specification of procedure unregister_netdev [2022-11-23 15:47:05,623 INFO L138 BoogieDeclarations]: Found implementation of procedure unregister_netdev [2022-11-23 15:47:05,624 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~int [2022-11-23 15:47:05,624 INFO L130 BoogieDeclarations]: Found specification of procedure usb_8dev_send_cmd [2022-11-23 15:47:05,624 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_8dev_send_cmd [2022-11-23 15:47:05,624 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_zalloc [2022-11-23 15:47:05,624 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_zalloc [2022-11-23 15:47:05,625 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 15:47:05,625 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 15:47:05,625 INFO L130 BoogieDeclarations]: Found specification of procedure usb_8dev_cmd_open [2022-11-23 15:47:05,625 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_8dev_cmd_open [2022-11-23 15:47:06,198 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 15:47:06,202 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 15:47:06,379 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2022-11-23 15:47:07,224 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stop___0FINAL: assume true; [2022-11-23 15:47:11,550 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 15:47:12,302 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 15:47:12,303 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-23 15:47:12,311 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:47:12 BoogieIcfgContainer [2022-11-23 15:47:12,311 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 15:47:12,314 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 15:47:12,314 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 15:47:12,317 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 15:47:12,318 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:47:03" (1/3) ... [2022-11-23 15:47:12,320 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@274fd14a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:47:12, skipping insertion in model container [2022-11-23 15:47:12,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:47:05" (2/3) ... [2022-11-23 15:47:12,323 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@274fd14a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:47:12, skipping insertion in model container [2022-11-23 15:47:12,328 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:47:12" (3/3) ... [2022-11-23 15:47:12,331 INFO L112 eAbstractionObserver]: Analyzing ICFG linux-3.12-rc1.tar.xz-144_2a-drivers--net--can--usb--usb_8dev.ko-entry_point.cil.out.i [2022-11-23 15:47:12,381 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 15:47:12,381 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 15:47:12,468 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 15:47:12,476 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;@4277a18f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 15:47:12,476 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 15:47:12,486 INFO L276 IsEmpty]: Start isEmpty. Operand has 468 states, 292 states have (on average 1.3527397260273972) internal successors, (395), 311 states have internal predecessors, (395), 132 states have call successors, (132), 44 states have call predecessors, (132), 42 states have return successors, (126), 125 states have call predecessors, (126), 126 states have call successors, (126) [2022-11-23 15:47:12,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-23 15:47:12,513 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:12,514 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:47:12,514 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:12,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:12,522 INFO L85 PathProgramCache]: Analyzing trace with hash 2139448133, now seen corresponding path program 1 times [2022-11-23 15:47:12,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:12,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646820572] [2022-11-23 15:47:12,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:12,534 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:12,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:13,228 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 15:47:13,229 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:13,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646820572] [2022-11-23 15:47:13,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646820572] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:47:13,230 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:47:13,230 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 15:47:13,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312314496] [2022-11-23 15:47:13,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:47:13,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:47:13,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:47:13,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:47:13,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:13,287 INFO L87 Difference]: Start difference. First operand has 468 states, 292 states have (on average 1.3527397260273972) internal successors, (395), 311 states have internal predecessors, (395), 132 states have call successors, (132), 44 states have call predecessors, (132), 42 states have return successors, (126), 125 states have call predecessors, (126), 126 states have call successors, (126) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 15:47:16,833 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:47:17,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:47:17,008 INFO L93 Difference]: Finished difference Result 1370 states and 1911 transitions. [2022-11-23 15:47:17,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:47:17,011 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 23 [2022-11-23 15:47:17,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:47:17,031 INFO L225 Difference]: With dead ends: 1370 [2022-11-23 15:47:17,031 INFO L226 Difference]: Without dead ends: 887 [2022-11-23 15:47:17,038 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:17,041 INFO L413 NwaCegarLoop]: 669 mSDtfsCounter, 605 mSDsluCounter, 541 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 606 SdHoareTripleChecker+Valid, 1210 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-23 15:47:17,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [606 Valid, 1210 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 200 Invalid, 1 Unknown, 0 Unchecked, 3.6s Time] [2022-11-23 15:47:17,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 887 states. [2022-11-23 15:47:17,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 887 to 887. [2022-11-23 15:47:17,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 887 states, 562 states have (on average 1.3202846975088969) internal successors, (742), 580 states have internal predecessors, (742), 242 states have call successors, (242), 83 states have call predecessors, (242), 82 states have return successors, (238), 235 states have call predecessors, (238), 237 states have call successors, (238) [2022-11-23 15:47:17,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 887 states to 887 states and 1222 transitions. [2022-11-23 15:47:17,271 INFO L78 Accepts]: Start accepts. Automaton has 887 states and 1222 transitions. Word has length 23 [2022-11-23 15:47:17,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:47:17,272 INFO L495 AbstractCegarLoop]: Abstraction has 887 states and 1222 transitions. [2022-11-23 15:47:17,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 15:47:17,277 INFO L276 IsEmpty]: Start isEmpty. Operand 887 states and 1222 transitions. [2022-11-23 15:47:17,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-23 15:47:17,280 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:17,280 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:47:17,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 15:47:17,281 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:17,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:17,282 INFO L85 PathProgramCache]: Analyzing trace with hash 1403421984, now seen corresponding path program 1 times [2022-11-23 15:47:17,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:17,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008493067] [2022-11-23 15:47:17,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:17,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:17,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:17,854 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:47:17,854 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:17,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008493067] [2022-11-23 15:47:17,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008493067] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:47:17,855 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:47:17,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 15:47:17,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365997345] [2022-11-23 15:47:17,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:47:17,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:47:17,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:47:17,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:47:17,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:17,859 INFO L87 Difference]: Start difference. First operand 887 states and 1222 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 15:47:20,926 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:47:21,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:47:21,097 INFO L93 Difference]: Finished difference Result 1423 states and 1948 transitions. [2022-11-23 15:47:21,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:47:21,097 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 32 [2022-11-23 15:47:21,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:47:21,109 INFO L225 Difference]: With dead ends: 1423 [2022-11-23 15:47:21,109 INFO L226 Difference]: Without dead ends: 1420 [2022-11-23 15:47:21,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:21,112 INFO L413 NwaCegarLoop]: 597 mSDtfsCounter, 361 mSDsluCounter, 526 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 1123 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:47:21,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [361 Valid, 1123 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 193 Invalid, 1 Unknown, 0 Unchecked, 3.1s Time] [2022-11-23 15:47:21,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1420 states. [2022-11-23 15:47:21,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1420 to 1408. [2022-11-23 15:47:21,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1408 states, 901 states have (on average 1.3263041065482797) internal successors, (1195), 925 states have internal predecessors, (1195), 370 states have call successors, (370), 139 states have call predecessors, (370), 136 states have return successors, (366), 357 states have call predecessors, (366), 365 states have call successors, (366) [2022-11-23 15:47:21,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1408 states to 1408 states and 1931 transitions. [2022-11-23 15:47:21,225 INFO L78 Accepts]: Start accepts. Automaton has 1408 states and 1931 transitions. Word has length 32 [2022-11-23 15:47:21,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:47:21,225 INFO L495 AbstractCegarLoop]: Abstraction has 1408 states and 1931 transitions. [2022-11-23 15:47:21,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 15:47:21,226 INFO L276 IsEmpty]: Start isEmpty. Operand 1408 states and 1931 transitions. [2022-11-23 15:47:21,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-23 15:47:21,228 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:21,228 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:47:21,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 15:47:21,229 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:21,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:21,229 INFO L85 PathProgramCache]: Analyzing trace with hash 556072814, now seen corresponding path program 1 times [2022-11-23 15:47:21,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:21,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833718169] [2022-11-23 15:47:21,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:21,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:21,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:21,756 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:47:21,756 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:21,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833718169] [2022-11-23 15:47:21,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833718169] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:47:21,757 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:47:21,757 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 15:47:21,757 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620569914] [2022-11-23 15:47:21,757 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:47:21,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:47:21,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:47:21,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:47:21,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:21,767 INFO L87 Difference]: Start difference. First operand 1408 states and 1931 transitions. Second operand has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 15:47:24,553 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:47:24,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:47:24,816 INFO L93 Difference]: Finished difference Result 1558 states and 2111 transitions. [2022-11-23 15:47:24,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:47:24,817 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 33 [2022-11-23 15:47:24,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:47:24,828 INFO L225 Difference]: With dead ends: 1558 [2022-11-23 15:47:24,828 INFO L226 Difference]: Without dead ends: 1555 [2022-11-23 15:47:24,829 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:24,830 INFO L413 NwaCegarLoop]: 574 mSDtfsCounter, 605 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 606 SdHoareTripleChecker+Valid, 715 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-11-23 15:47:24,831 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [606 Valid, 715 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 141 Invalid, 1 Unknown, 0 Unchecked, 2.9s Time] [2022-11-23 15:47:24,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1555 states. [2022-11-23 15:47:24,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1555 to 1555. [2022-11-23 15:47:24,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1555 states, 990 states have (on average 1.3212121212121213) internal successors, (1308), 1018 states have internal predecessors, (1308), 401 states have call successors, (401), 166 states have call predecessors, (401), 163 states have return successors, (399), 388 states have call predecessors, (399), 397 states have call successors, (399) [2022-11-23 15:47:24,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1555 states to 1555 states and 2108 transitions. [2022-11-23 15:47:24,950 INFO L78 Accepts]: Start accepts. Automaton has 1555 states and 2108 transitions. Word has length 33 [2022-11-23 15:47:24,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:47:24,951 INFO L495 AbstractCegarLoop]: Abstraction has 1555 states and 2108 transitions. [2022-11-23 15:47:24,951 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 15:47:24,951 INFO L276 IsEmpty]: Start isEmpty. Operand 1555 states and 2108 transitions. [2022-11-23 15:47:24,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-23 15:47:24,957 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:24,958 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 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] [2022-11-23 15:47:24,958 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-23 15:47:24,959 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:24,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:24,960 INFO L85 PathProgramCache]: Analyzing trace with hash 58057187, now seen corresponding path program 1 times [2022-11-23 15:47:24,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:24,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522369871] [2022-11-23 15:47:24,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:24,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:25,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:25,159 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:47:25,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:25,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522369871] [2022-11-23 15:47:25,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522369871] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:47:25,160 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:47:25,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 15:47:25,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112539854] [2022-11-23 15:47:25,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:47:25,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:47:25,161 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:47:25,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:47:25,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:25,165 INFO L87 Difference]: Start difference. First operand 1555 states and 2108 transitions. Second operand has 3 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 15:47:28,103 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:47:28,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:47:28,363 INFO L93 Difference]: Finished difference Result 1557 states and 2109 transitions. [2022-11-23 15:47:28,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:47:28,363 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 34 [2022-11-23 15:47:28,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:47:28,373 INFO L225 Difference]: With dead ends: 1557 [2022-11-23 15:47:28,374 INFO L226 Difference]: Without dead ends: 1554 [2022-11-23 15:47:28,375 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:28,376 INFO L413 NwaCegarLoop]: 572 mSDtfsCounter, 602 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 603 SdHoareTripleChecker+Valid, 713 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:47:28,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [603 Valid, 713 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 141 Invalid, 1 Unknown, 0 Unchecked, 3.1s Time] [2022-11-23 15:47:28,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1554 states. [2022-11-23 15:47:28,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1554 to 1554. [2022-11-23 15:47:28,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1554 states, 990 states have (on average 1.3202020202020202) internal successors, (1307), 1017 states have internal predecessors, (1307), 400 states have call successors, (400), 166 states have call predecessors, (400), 163 states have return successors, (399), 388 states have call predecessors, (399), 397 states have call successors, (399) [2022-11-23 15:47:28,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1554 states to 1554 states and 2106 transitions. [2022-11-23 15:47:28,495 INFO L78 Accepts]: Start accepts. Automaton has 1554 states and 2106 transitions. Word has length 34 [2022-11-23 15:47:28,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:47:28,495 INFO L495 AbstractCegarLoop]: Abstraction has 1554 states and 2106 transitions. [2022-11-23 15:47:28,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 15:47:28,496 INFO L276 IsEmpty]: Start isEmpty. Operand 1554 states and 2106 transitions. [2022-11-23 15:47:28,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 15:47:28,499 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:28,499 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 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] [2022-11-23 15:47:28,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-23 15:47:28,500 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:28,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:28,500 INFO L85 PathProgramCache]: Analyzing trace with hash 1799446801, now seen corresponding path program 1 times [2022-11-23 15:47:28,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:28,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213664665] [2022-11-23 15:47:28,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:28,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:28,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:28,655 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:47:28,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:28,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213664665] [2022-11-23 15:47:28,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213664665] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:47:28,656 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:47:28,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 15:47:28,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463378756] [2022-11-23 15:47:28,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:47:28,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:47:28,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:47:28,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:47:28,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:28,659 INFO L87 Difference]: Start difference. First operand 1554 states and 2106 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 15:47:31,508 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:47:31,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:47:31,751 INFO L93 Difference]: Finished difference Result 1556 states and 2107 transitions. [2022-11-23 15:47:31,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:47:31,752 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 35 [2022-11-23 15:47:31,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:47:31,764 INFO L225 Difference]: With dead ends: 1556 [2022-11-23 15:47:31,764 INFO L226 Difference]: Without dead ends: 1553 [2022-11-23 15:47:31,765 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:31,766 INFO L413 NwaCegarLoop]: 570 mSDtfsCounter, 599 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 600 SdHoareTripleChecker+Valid, 711 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:47:31,766 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [600 Valid, 711 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 141 Invalid, 1 Unknown, 0 Unchecked, 3.0s Time] [2022-11-23 15:47:31,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1553 states. [2022-11-23 15:47:31,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1553 to 1553. [2022-11-23 15:47:31,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1553 states, 990 states have (on average 1.3191919191919192) internal successors, (1306), 1016 states have internal predecessors, (1306), 399 states have call successors, (399), 166 states have call predecessors, (399), 163 states have return successors, (399), 388 states have call predecessors, (399), 397 states have call successors, (399) [2022-11-23 15:47:31,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1553 states to 1553 states and 2104 transitions. [2022-11-23 15:47:31,885 INFO L78 Accepts]: Start accepts. Automaton has 1553 states and 2104 transitions. Word has length 35 [2022-11-23 15:47:31,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:47:31,886 INFO L495 AbstractCegarLoop]: Abstraction has 1553 states and 2104 transitions. [2022-11-23 15:47:31,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 15:47:31,886 INFO L276 IsEmpty]: Start isEmpty. Operand 1553 states and 2104 transitions. [2022-11-23 15:47:31,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-23 15:47:31,887 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:31,887 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 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] [2022-11-23 15:47:31,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-23 15:47:31,888 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:31,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:31,888 INFO L85 PathProgramCache]: Analyzing trace with hash -52045146, now seen corresponding path program 1 times [2022-11-23 15:47:31,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:31,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479855116] [2022-11-23 15:47:31,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:31,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:31,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:32,025 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:47:32,026 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:32,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479855116] [2022-11-23 15:47:32,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479855116] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:47:32,026 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:47:32,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 15:47:32,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267614316] [2022-11-23 15:47:32,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:47:32,027 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:47:32,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:47:32,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:47:32,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:32,028 INFO L87 Difference]: Start difference. First operand 1553 states and 2104 transitions. Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 15:47:34,960 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:47:35,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:47:35,227 INFO L93 Difference]: Finished difference Result 1555 states and 2105 transitions. [2022-11-23 15:47:35,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:47:35,228 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2022-11-23 15:47:35,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:47:35,236 INFO L225 Difference]: With dead ends: 1555 [2022-11-23 15:47:35,236 INFO L226 Difference]: Without dead ends: 1546 [2022-11-23 15:47:35,237 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:35,239 INFO L413 NwaCegarLoop]: 569 mSDtfsCounter, 596 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 597 SdHoareTripleChecker+Valid, 710 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:47:35,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [597 Valid, 710 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 140 Invalid, 1 Unknown, 0 Unchecked, 3.0s Time] [2022-11-23 15:47:35,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2022-11-23 15:47:35,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1546. [2022-11-23 15:47:35,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1546 states, 984 states have (on average 1.3170731707317074) internal successors, (1296), 1009 states have internal predecessors, (1296), 398 states have call successors, (398), 166 states have call predecessors, (398), 163 states have return successors, (399), 388 states have call predecessors, (399), 397 states have call successors, (399) [2022-11-23 15:47:35,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1546 states to 1546 states and 2093 transitions. [2022-11-23 15:47:35,356 INFO L78 Accepts]: Start accepts. Automaton has 1546 states and 2093 transitions. Word has length 36 [2022-11-23 15:47:35,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:47:35,356 INFO L495 AbstractCegarLoop]: Abstraction has 1546 states and 2093 transitions. [2022-11-23 15:47:35,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 15:47:35,357 INFO L276 IsEmpty]: Start isEmpty. Operand 1546 states and 2093 transitions. [2022-11-23 15:47:35,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-23 15:47:35,361 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:35,361 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:47:35,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-23 15:47:35,362 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:35,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:35,362 INFO L85 PathProgramCache]: Analyzing trace with hash 1147701699, now seen corresponding path program 1 times [2022-11-23 15:47:35,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:35,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144219036] [2022-11-23 15:47:35,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:35,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:35,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:35,523 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:47:35,524 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:35,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144219036] [2022-11-23 15:47:35,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144219036] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:47:35,524 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:47:35,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 15:47:35,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711572803] [2022-11-23 15:47:35,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:47:35,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:47:35,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:47:35,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:47:35,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:35,528 INFO L87 Difference]: Start difference. First operand 1546 states and 2093 transitions. Second operand has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:47:38,714 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:47:38,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:47:38,940 INFO L93 Difference]: Finished difference Result 3650 states and 4918 transitions. [2022-11-23 15:47:38,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:47:38,941 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 67 [2022-11-23 15:47:38,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:47:38,953 INFO L225 Difference]: With dead ends: 3650 [2022-11-23 15:47:38,953 INFO L226 Difference]: Without dead ends: 2109 [2022-11-23 15:47:38,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:38,964 INFO L413 NwaCegarLoop]: 585 mSDtfsCounter, 194 mSDsluCounter, 506 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 1091 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:47:38,965 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [194 Valid, 1091 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 209 Invalid, 1 Unknown, 0 Unchecked, 3.2s Time] [2022-11-23 15:47:38,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2109 states. [2022-11-23 15:47:39,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2109 to 2104. [2022-11-23 15:47:39,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2104 states, 1354 states have (on average 1.3183161004431314) internal successors, (1785), 1383 states have internal predecessors, (1785), 519 states have call successors, (519), 233 states have call predecessors, (519), 230 states have return successors, (520), 509 states have call predecessors, (520), 518 states have call successors, (520) [2022-11-23 15:47:39,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2104 states to 2104 states and 2824 transitions. [2022-11-23 15:47:39,140 INFO L78 Accepts]: Start accepts. Automaton has 2104 states and 2824 transitions. Word has length 67 [2022-11-23 15:47:39,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:47:39,141 INFO L495 AbstractCegarLoop]: Abstraction has 2104 states and 2824 transitions. [2022-11-23 15:47:39,141 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:47:39,141 INFO L276 IsEmpty]: Start isEmpty. Operand 2104 states and 2824 transitions. [2022-11-23 15:47:39,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-23 15:47:39,147 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:39,147 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:47:39,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-23 15:47:39,147 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:39,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:39,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1067073844, now seen corresponding path program 1 times [2022-11-23 15:47:39,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:39,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237612715] [2022-11-23 15:47:39,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:39,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:39,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:39,451 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-23 15:47:39,451 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:39,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237612715] [2022-11-23 15:47:39,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1237612715] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:47:39,452 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:47:39,452 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 15:47:39,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389907542] [2022-11-23 15:47:39,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:47:39,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:47:39,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:47:39,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:47:39,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:39,454 INFO L87 Difference]: Start difference. First operand 2104 states and 2824 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-23 15:47:42,944 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:47:43,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:47:43,196 INFO L93 Difference]: Finished difference Result 4794 states and 6438 transitions. [2022-11-23 15:47:43,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:47:43,197 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 79 [2022-11-23 15:47:43,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:47:43,215 INFO L225 Difference]: With dead ends: 4794 [2022-11-23 15:47:43,215 INFO L226 Difference]: Without dead ends: 2701 [2022-11-23 15:47:43,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:47:43,224 INFO L413 NwaCegarLoop]: 674 mSDtfsCounter, 198 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 1183 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-23 15:47:43,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 1183 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 236 Invalid, 1 Unknown, 0 Unchecked, 3.5s Time] [2022-11-23 15:47:43,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2701 states. [2022-11-23 15:47:43,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2701 to 2696. [2022-11-23 15:47:43,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2696 states, 1760 states have (on average 1.3232954545454545) internal successors, (2329), 1793 states have internal predecessors, (2329), 639 states have call successors, (639), 299 states have call predecessors, (639), 296 states have return successors, (640), 629 states have call predecessors, (640), 638 states have call successors, (640) [2022-11-23 15:47:43,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2696 states to 2696 states and 3608 transitions. [2022-11-23 15:47:43,483 INFO L78 Accepts]: Start accepts. Automaton has 2696 states and 3608 transitions. Word has length 79 [2022-11-23 15:47:43,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:47:43,484 INFO L495 AbstractCegarLoop]: Abstraction has 2696 states and 3608 transitions. [2022-11-23 15:47:43,484 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-23 15:47:43,484 INFO L276 IsEmpty]: Start isEmpty. Operand 2696 states and 3608 transitions. [2022-11-23 15:47:43,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-11-23 15:47:43,488 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:43,488 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:47:43,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-23 15:47:43,489 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:43,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:43,489 INFO L85 PathProgramCache]: Analyzing trace with hash -1345299885, now seen corresponding path program 1 times [2022-11-23 15:47:43,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:43,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2017529068] [2022-11-23 15:47:43,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:43,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:43,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:44,246 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 17 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-23 15:47:44,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:44,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2017529068] [2022-11-23 15:47:44,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2017529068] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:47:44,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103273582] [2022-11-23 15:47:44,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:44,247 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:47:44,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:47:44,255 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:47:44,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 15:47:44,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:44,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-23 15:47:44,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:47:45,107 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-11-23 15:47:45,108 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:47:45,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103273582] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:47:45,109 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 15:47:45,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 9 [2022-11-23 15:47:45,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854472491] [2022-11-23 15:47:45,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:47:45,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 15:47:45,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:47:45,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 15:47:45,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-11-23 15:47:45,112 INFO L87 Difference]: Start difference. First operand 2696 states and 3608 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-23 15:47:48,974 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:47:49,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:47:49,458 INFO L93 Difference]: Finished difference Result 5357 states and 7400 transitions. [2022-11-23 15:47:49,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 15:47:49,459 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 2 states have call successors, (9), 2 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 88 [2022-11-23 15:47:49,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:47:49,481 INFO L225 Difference]: With dead ends: 5357 [2022-11-23 15:47:49,481 INFO L226 Difference]: Without dead ends: 3733 [2022-11-23 15:47:49,489 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-11-23 15:47:49,491 INFO L413 NwaCegarLoop]: 711 mSDtfsCounter, 284 mSDsluCounter, 1119 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 80 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 1830 SdHoareTripleChecker+Invalid, 400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:47:49,492 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [285 Valid, 1830 Invalid, 400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 319 Invalid, 1 Unknown, 0 Unchecked, 4.0s Time] [2022-11-23 15:47:49,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3733 states. [2022-11-23 15:47:49,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3733 to 2704. [2022-11-23 15:47:49,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2704 states, 1768 states have (on average 1.3218325791855203) internal successors, (2337), 1801 states have internal predecessors, (2337), 639 states have call successors, (639), 299 states have call predecessors, (639), 296 states have return successors, (640), 629 states have call predecessors, (640), 638 states have call successors, (640) [2022-11-23 15:47:49,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2704 states to 2704 states and 3616 transitions. [2022-11-23 15:47:49,797 INFO L78 Accepts]: Start accepts. Automaton has 2704 states and 3616 transitions. Word has length 88 [2022-11-23 15:47:49,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:47:49,798 INFO L495 AbstractCegarLoop]: Abstraction has 2704 states and 3616 transitions. [2022-11-23 15:47:49,798 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-23 15:47:49,798 INFO L276 IsEmpty]: Start isEmpty. Operand 2704 states and 3616 transitions. [2022-11-23 15:47:49,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-11-23 15:47:49,808 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:49,808 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:47:49,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 15:47:50,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:47:50,017 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:50,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:50,018 INFO L85 PathProgramCache]: Analyzing trace with hash -110739469, now seen corresponding path program 1 times [2022-11-23 15:47:50,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:50,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762813982] [2022-11-23 15:47:50,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:50,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:50,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:50,847 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 17 proven. 8 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 15:47:50,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:50,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762813982] [2022-11-23 15:47:50,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762813982] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:47:50,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728253989] [2022-11-23 15:47:50,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:50,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:47:50,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:47:50,863 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:47:50,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 15:47:51,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:51,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 1398 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 15:47:51,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:47:51,917 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 29 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-23 15:47:51,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:47:52,145 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-23 15:47:52,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [728253989] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 15:47:52,145 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:47:52,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7, 6] total 11 [2022-11-23 15:47:52,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705879425] [2022-11-23 15:47:52,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:47:52,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 15:47:52,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:47:52,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 15:47:52,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2022-11-23 15:47:52,147 INFO L87 Difference]: Start difference. First operand 2704 states and 3616 transitions. Second operand has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-23 15:47:55,809 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:47:56,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:47:56,734 INFO L93 Difference]: Finished difference Result 6517 states and 8733 transitions. [2022-11-23 15:47:56,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 15:47:56,735 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 97 [2022-11-23 15:47:56,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:47:56,755 INFO L225 Difference]: With dead ends: 6517 [2022-11-23 15:47:56,756 INFO L226 Difference]: Without dead ends: 3824 [2022-11-23 15:47:56,764 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=78, Unknown=0, NotChecked=0, Total=132 [2022-11-23 15:47:56,765 INFO L413 NwaCegarLoop]: 625 mSDtfsCounter, 1196 mSDsluCounter, 680 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 390 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1241 SdHoareTripleChecker+Valid, 1305 SdHoareTripleChecker+Invalid, 831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 390 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:47:56,765 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1241 Valid, 1305 Invalid, 831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [390 Valid, 440 Invalid, 1 Unknown, 0 Unchecked, 4.1s Time] [2022-11-23 15:47:56,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3824 states. [2022-11-23 15:47:57,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3824 to 3572. [2022-11-23 15:47:57,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3572 states, 2340 states have (on average 1.3235042735042735) internal successors, (3097), 2385 states have internal predecessors, (3097), 817 states have call successors, (817), 419 states have call predecessors, (817), 414 states have return successors, (820), 803 states have call predecessors, (820), 816 states have call successors, (820) [2022-11-23 15:47:57,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3572 states to 3572 states and 4734 transitions. [2022-11-23 15:47:57,171 INFO L78 Accepts]: Start accepts. Automaton has 3572 states and 4734 transitions. Word has length 97 [2022-11-23 15:47:57,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:47:57,173 INFO L495 AbstractCegarLoop]: Abstraction has 3572 states and 4734 transitions. [2022-11-23 15:47:57,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-23 15:47:57,174 INFO L276 IsEmpty]: Start isEmpty. Operand 3572 states and 4734 transitions. [2022-11-23 15:47:57,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-23 15:47:57,179 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:47:57,179 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:47:57,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 15:47:57,400 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 15:47:57,400 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:47:57,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:47:57,401 INFO L85 PathProgramCache]: Analyzing trace with hash -1052655286, now seen corresponding path program 1 times [2022-11-23 15:47:57,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:47:57,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169665834] [2022-11-23 15:47:57,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:57,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:47:57,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:58,128 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-23 15:47:58,128 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:47:58,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169665834] [2022-11-23 15:47:58,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169665834] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:47:58,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732006851] [2022-11-23 15:47:58,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:47:58,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:47:58,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:47:58,132 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:47:58,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 15:47:58,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:47:58,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 1353 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 15:47:58,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:47:59,578 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 31 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 15:47:59,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:48:00,232 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 11 proven. 13 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-23 15:48:00,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732006851] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:48:00,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1727530346] [2022-11-23 15:48:00,260 INFO L159 IcfgInterpreter]: Started Sifa with 70 locations of interest [2022-11-23 15:48:00,261 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:48:00,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:48:00,271 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:48:00,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:48:02,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:02,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:02,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:02,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:02,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:02,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:02,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:02,512 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 28 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 62 [2022-11-23 15:48:02,710 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 28 [2022-11-23 15:48:02,765 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 15:48:02,949 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 85 [2022-11-23 15:48:03,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:03,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:03,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:03,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:03,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:03,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:04,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:04,007 INFO L217 Elim1Store]: Index analysis took 118 ms [2022-11-23 15:48:04,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 28 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 62 [2022-11-23 15:48:04,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 15:48:04,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 19 [2022-11-23 15:48:05,925 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 397 treesize of output 321 [2022-11-23 15:48:05,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:05,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:05,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:05,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:06,049 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 24 select indices, 24 select index equivalence classes, 276 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 0 case distinctions, treesize of input 167 treesize of output 73 [2022-11-23 15:48:06,115 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 11 select indices, 11 select index equivalence classes, 55 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 78 treesize of output 34 [2022-11-23 15:48:07,100 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 397 treesize of output 321 [2022-11-23 15:48:07,155 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 11 select indices, 11 select index equivalence classes, 55 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 78 treesize of output 34 [2022-11-23 15:48:07,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:48:07,266 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 24 select indices, 24 select index equivalence classes, 276 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 0 case distinctions, treesize of input 167 treesize of output 73 [2022-11-23 15:50:40,560 INFO L197 IcfgInterpreter]: Interpreting procedure can_led_event with input of size 126 for LOIs [2022-11-23 15:50:40,572 INFO L197 IcfgInterpreter]: Interpreting procedure close_candev with input of size 219 for LOIs [2022-11-23 15:50:40,644 INFO L197 IcfgInterpreter]: Interpreting procedure ldv_zalloc with input of size 224 for LOIs [2022-11-23 15:50:40,884 INFO L197 IcfgInterpreter]: Interpreting procedure ldv_alloc_urb with input of size 222 for LOIs [2022-11-23 15:50:43,538 INFO L197 IcfgInterpreter]: Interpreting procedure ldv_undef_int with input of size 213 for LOIs [2022-11-23 15:50:43,604 INFO L197 IcfgInterpreter]: Interpreting procedure ldv_error with input of size 122 for LOIs [2022-11-23 15:50:43,615 INFO L197 IcfgInterpreter]: Interpreting procedure ldv_malloc with input of size 221 for LOIs [2022-11-23 15:50:43,812 INFO L197 IcfgInterpreter]: Interpreting procedure netdev_priv with input of size 120 for LOIs [2022-11-23 15:50:43,822 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:50:53,985 WARN L233 SmtUtils]: Spent 9.09s on a formula simplification that was a NOOP. DAG size: 995 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:51:15,074 WARN L233 SmtUtils]: Spent 7.70s on a formula simplification. DAG size of input: 654 DAG size of output: 651 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:52:23,245 WARN L233 SmtUtils]: Spent 9.75s on a formula simplification. DAG size of input: 453 DAG size of output: 327 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:52:29,789 WARN L233 SmtUtils]: Spent 5.82s on a formula simplification. DAG size of input: 445 DAG size of output: 317 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:53:04,623 WARN L233 SmtUtils]: Spent 10.99s on a formula simplification. DAG size of input: 456 DAG size of output: 339 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:53:12,395 WARN L233 SmtUtils]: Spent 6.86s on a formula simplification. DAG size of input: 456 DAG size of output: 320 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:53:20,372 WARN L233 SmtUtils]: Spent 7.03s on a formula simplification. DAG size of input: 463 DAG size of output: 327 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:53:28,165 WARN L233 SmtUtils]: Spent 6.81s on a formula simplification. DAG size of input: 463 DAG size of output: 323 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:53:35,219 WARN L233 SmtUtils]: Spent 6.18s on a formula simplification. DAG size of input: 464 DAG size of output: 317 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:53:53,137 WARN L233 SmtUtils]: Spent 9.00s on a formula simplification. DAG size of input: 473 DAG size of output: 383 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:53:55,894 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '75329#(and (<= 0 ~ldv_state_variable_2~0) (= ~__mod_usb_device_table~0.bInterfaceClass 0) (= ~__mod_usb_device_table~0.bcdDevice_hi 0) (= ~INTERF_STATE~0 0) (= |~#usb_8dev_table~0.offset| 0) (= ~LDV_IN_INTERRUPT~0 1) (<= ~usb_8dev_driver_group1~0.offset 0) (<= ~usb_8dev_netdev_ops_group1~0.offset 0) (= ~ldv_retval_1~0 0) (= ~__mod_usb_device_table~0.idVendor 0) (= ~usb_intfdata~0.base 0) (= ~completeFnBulk~0.base 0) (= ~completeFnBulkCounter~0 0) (<= 0 ~usb_8dev_driver_group1~0.offset) (= ~__mod_usb_device_table~0.bcdDevice_lo 0) (= ~__mod_usb_device_table~0.bDeviceProtocol 0) (= |~#usb_8dev_bittiming_const~0.base| 39) (= |~#usb_8dev_table~0.base| 37) (= ~__mod_usb_device_table~0.idProduct 0) (<= ~ldv_retval_3~0 0) (= ~__mod_usb_device_table~0.match_flags 0) (= ~__mod_usb_device_table~0.driver_info 0) (= ~ldv_state_variable_1~0 0) (= ~usb_dev~0.base 0) (= |~#usb_8dev_bittiming_const~0.offset| 0) (<= ~usb_8dev_driver_group1~0.base 0) (= ~ldv_state_variable_0~0 2) (= ~usb_dev~0.offset 0) (= ~dev_counter~0 0) (= ~__mod_usb_device_table~0.bDeviceClass 0) (<= 0 (+ ~ldv_retval_3~0 12)) (not (= (mod (+ ~usb_urb~0.base ~usb_urb~0.offset) 18446744073709551616) 0)) (= ~__mod_usb_device_table~0.bInterfaceSubClass 0) (= |~#usb_8dev_driver~0.offset| 0) (= ~ref_cnt~0 0) (= ~completeFnInt~0.base 0) (<= 0 ~usb_8dev_netdev_ops_group1~0.offset) (= ~__mod_usb_device_table~0.bInterfaceNumber 0) (= ~completeFnInt~0.offset 0) (= ~usb_intfdata~0.offset 0) (= |~#usb_8dev_netdev_ops~0.offset| 0) (= ~completeFnBulk~0.offset 0) (= ~__mod_usb_device_table~0.bDeviceSubClass 0) (= |#NULL.offset| 0) (<= ~usb_8dev_netdev_ops_group1~0.base 0) (= ~ldv_retval_0~0 0) (<= 0 ~usb_counter~0) (= 38 |~#usb_8dev_netdev_ops~0.base|) (= ~__mod_usb_device_table~0.bInterfaceProtocol 0) (= ~SERIAL_STATE~0 0) (= ~completeFnIntCounter~0 0) (<= 0 |#StackHeapBarrier|) (<= 0 ~usb_8dev_netdev_ops_group1~0.base) (= 40 |~#usb_8dev_driver~0.base|) (= |#NULL.base| 0) (<= 0 ~usb_8dev_driver_group1~0.base))' at error location [2022-11-23 15:53:55,894 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:53:55,894 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:53:55,894 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8] total 16 [2022-11-23 15:53:55,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334863624] [2022-11-23 15:53:55,895 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:53:55,895 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 15:53:55,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:53:55,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 15:53:55,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=542, Invalid=5008, Unknown=0, NotChecked=0, Total=5550 [2022-11-23 15:53:55,899 INFO L87 Difference]: Start difference. First operand 3572 states and 4734 transitions. Second operand has 16 states, 16 states have (on average 9.375) internal successors, (150), 16 states have internal predecessors, (150), 9 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-23 15:54:12,906 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:54:21,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:54:21,750 INFO L93 Difference]: Finished difference Result 25105 states and 33331 transitions. [2022-11-23 15:54:21,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-23 15:54:21,751 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.375) internal successors, (150), 16 states have internal predecessors, (150), 9 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 96 [2022-11-23 15:54:21,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:54:21,859 INFO L225 Difference]: With dead ends: 25105 [2022-11-23 15:54:21,859 INFO L226 Difference]: Without dead ends: 21536 [2022-11-23 15:54:21,881 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 221 SyntacticMatches, 7 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3734 ImplicationChecksByTransitivity, 194.2s TimeCoverageRelationStatistics Valid=929, Invalid=7627, Unknown=0, NotChecked=0, Total=8556 [2022-11-23 15:54:21,882 INFO L413 NwaCegarLoop]: 1710 mSDtfsCounter, 5974 mSDsluCounter, 6046 mSDsCounter, 0 mSdLazyCounter, 8474 mSolverCounterSat, 3309 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6010 SdHoareTripleChecker+Valid, 7756 SdHoareTripleChecker+Invalid, 11784 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3309 IncrementalHoareTripleChecker+Valid, 8474 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:54:21,882 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6010 Valid, 7756 Invalid, 11784 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3309 Valid, 8474 Invalid, 1 Unknown, 0 Unchecked, 21.3s Time] [2022-11-23 15:54:21,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21536 states. [2022-11-23 15:54:23,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21536 to 17752. [2022-11-23 15:54:23,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17752 states, 11856 states have (on average 1.3411774628879891) internal successors, (15901), 12091 states have internal predecessors, (15901), 3881 states have call successors, (3881), 2027 states have call predecessors, (3881), 2014 states have return successors, (3892), 3783 states have call predecessors, (3892), 3880 states have call successors, (3892) [2022-11-23 15:54:24,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17752 states to 17752 states and 23674 transitions. [2022-11-23 15:54:24,047 INFO L78 Accepts]: Start accepts. Automaton has 17752 states and 23674 transitions. Word has length 96 [2022-11-23 15:54:24,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:54:24,048 INFO L495 AbstractCegarLoop]: Abstraction has 17752 states and 23674 transitions. [2022-11-23 15:54:24,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.375) internal successors, (150), 16 states have internal predecessors, (150), 9 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-23 15:54:24,048 INFO L276 IsEmpty]: Start isEmpty. Operand 17752 states and 23674 transitions. [2022-11-23 15:54:24,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-11-23 15:54:24,067 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:54:24,067 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:54:24,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 15:54:24,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-23 15:54:24,277 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:54:24,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:54:24,277 INFO L85 PathProgramCache]: Analyzing trace with hash 40049851, now seen corresponding path program 1 times [2022-11-23 15:54:24,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:54:24,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258240244] [2022-11-23 15:54:24,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:54:24,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:54:24,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:54:24,863 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 17 proven. 10 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-23 15:54:24,863 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:54:24,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258240244] [2022-11-23 15:54:24,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1258240244] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:54:24,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497745562] [2022-11-23 15:54:24,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:54:24,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:54:24,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:54:24,866 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:54:24,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 15:54:25,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:54:25,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 1441 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 15:54:25,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:54:25,912 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-23 15:54:25,913 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:54:25,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497745562] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:54:25,913 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 15:54:25,913 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2022-11-23 15:54:25,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844726687] [2022-11-23 15:54:25,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:54:25,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:54:25,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:54:25,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:54:25,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2022-11-23 15:54:25,915 INFO L87 Difference]: Start difference. First operand 17752 states and 23674 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-23 15:54:29,472 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:54:30,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:54:30,173 INFO L93 Difference]: Finished difference Result 25766 states and 34400 transitions. [2022-11-23 15:54:30,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:54:30,174 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 105 [2022-11-23 15:54:30,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:54:30,207 INFO L225 Difference]: With dead ends: 25766 [2022-11-23 15:54:30,207 INFO L226 Difference]: Without dead ends: 7629 [2022-11-23 15:54:30,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2022-11-23 15:54:30,249 INFO L413 NwaCegarLoop]: 674 mSDtfsCounter, 536 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 537 SdHoareTripleChecker+Valid, 942 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:54:30,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [537 Valid, 942 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 190 Invalid, 1 Unknown, 0 Unchecked, 3.4s Time] [2022-11-23 15:54:30,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7629 states. [2022-11-23 15:54:31,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7629 to 7212. [2022-11-23 15:54:31,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7212 states, 4799 states have (on average 1.3302771410710565) internal successors, (6384), 4900 states have internal predecessors, (6384), 1591 states have call successors, (1591), 828 states have call predecessors, (1591), 821 states have return successors, (1596), 1549 states have call predecessors, (1596), 1590 states have call successors, (1596) [2022-11-23 15:54:31,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7212 states to 7212 states and 9571 transitions. [2022-11-23 15:54:31,227 INFO L78 Accepts]: Start accepts. Automaton has 7212 states and 9571 transitions. Word has length 105 [2022-11-23 15:54:31,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:54:31,228 INFO L495 AbstractCegarLoop]: Abstraction has 7212 states and 9571 transitions. [2022-11-23 15:54:31,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-23 15:54:31,229 INFO L276 IsEmpty]: Start isEmpty. Operand 7212 states and 9571 transitions. [2022-11-23 15:54:31,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-23 15:54:31,243 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:54:31,243 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:54:31,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 15:54:31,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:54:31,455 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:54:31,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:54:31,456 INFO L85 PathProgramCache]: Analyzing trace with hash -975667106, now seen corresponding path program 1 times [2022-11-23 15:54:31,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:54:31,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945401074] [2022-11-23 15:54:31,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:54:31,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:54:31,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:54:33,094 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-23 15:54:33,094 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:54:33,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945401074] [2022-11-23 15:54:33,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [945401074] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:54:33,094 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:54:33,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-23 15:54:33,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865690468] [2022-11-23 15:54:33,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:54:33,095 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 15:54:33,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:54:33,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 15:54:33,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2022-11-23 15:54:33,096 INFO L87 Difference]: Start difference. First operand 7212 states and 9571 transitions. Second operand has 8 states, 7 states have (on average 8.0) internal successors, (56), 7 states have internal predecessors, (56), 4 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-23 15:54:40,433 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:54:42,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:54:42,832 INFO L93 Difference]: Finished difference Result 11202 states and 15046 transitions. [2022-11-23 15:54:42,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 15:54:42,833 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 8.0) internal successors, (56), 7 states have internal predecessors, (56), 4 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 106 [2022-11-23 15:54:42,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:54:42,885 INFO L225 Difference]: With dead ends: 11202 [2022-11-23 15:54:42,885 INFO L226 Difference]: Without dead ends: 10907 [2022-11-23 15:54:42,893 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2022-11-23 15:54:42,894 INFO L413 NwaCegarLoop]: 298 mSDtfsCounter, 965 mSDsluCounter, 632 mSDsCounter, 0 mSdLazyCounter, 2331 mSolverCounterSat, 444 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1077 SdHoareTripleChecker+Valid, 930 SdHoareTripleChecker+Invalid, 2776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 444 IncrementalHoareTripleChecker+Valid, 2331 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:54:42,895 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1077 Valid, 930 Invalid, 2776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [444 Valid, 2331 Invalid, 1 Unknown, 0 Unchecked, 8.3s Time] [2022-11-23 15:54:42,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10907 states. [2022-11-23 15:54:44,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10907 to 10657. [2022-11-23 15:54:44,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10657 states, 7050 states have (on average 1.3256737588652483) internal successors, (9346), 7223 states have internal predecessors, (9346), 2383 states have call successors, (2383), 1206 states have call predecessors, (2383), 1223 states have return successors, (2520), 2332 states have call predecessors, (2520), 2382 states have call successors, (2520) [2022-11-23 15:54:44,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10657 states to 10657 states and 14249 transitions. [2022-11-23 15:54:44,249 INFO L78 Accepts]: Start accepts. Automaton has 10657 states and 14249 transitions. Word has length 106 [2022-11-23 15:54:44,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:54:44,249 INFO L495 AbstractCegarLoop]: Abstraction has 10657 states and 14249 transitions. [2022-11-23 15:54:44,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 8.0) internal successors, (56), 7 states have internal predecessors, (56), 4 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-23 15:54:44,250 INFO L276 IsEmpty]: Start isEmpty. Operand 10657 states and 14249 transitions. [2022-11-23 15:54:44,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-23 15:54:44,267 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:54:44,267 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 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, 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] [2022-11-23 15:54:44,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-23 15:54:44,268 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:54:44,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:54:44,268 INFO L85 PathProgramCache]: Analyzing trace with hash 1096872017, now seen corresponding path program 1 times [2022-11-23 15:54:44,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:54:44,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490480572] [2022-11-23 15:54:44,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:54:44,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:54:44,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:54:45,178 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-23 15:54:45,178 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:54:45,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490480572] [2022-11-23 15:54:45,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490480572] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:54:45,179 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:54:45,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 15:54:45,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196802780] [2022-11-23 15:54:45,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:54:45,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 15:54:45,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:54:45,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 15:54:45,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:54:45,180 INFO L87 Difference]: Start difference. First operand 10657 states and 14249 transitions. Second operand has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 2 states have call successors, (11) [2022-11-23 15:54:52,631 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:54:54,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:54:54,647 INFO L93 Difference]: Finished difference Result 18816 states and 25786 transitions. [2022-11-23 15:54:54,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 15:54:54,648 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 2 states have call successors, (11) Word has length 110 [2022-11-23 15:54:54,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:54:54,727 INFO L225 Difference]: With dead ends: 18816 [2022-11-23 15:54:54,727 INFO L226 Difference]: Without dead ends: 18385 [2022-11-23 15:54:54,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-23 15:54:54,738 INFO L413 NwaCegarLoop]: 722 mSDtfsCounter, 517 mSDsluCounter, 1945 mSDsCounter, 0 mSdLazyCounter, 1239 mSolverCounterSat, 33 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 524 SdHoareTripleChecker+Valid, 2667 SdHoareTripleChecker+Invalid, 1273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1239 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:54:54,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [524 Valid, 2667 Invalid, 1273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1239 Invalid, 1 Unknown, 0 Unchecked, 7.0s Time] [2022-11-23 15:54:54,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18385 states. [2022-11-23 15:54:56,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18385 to 13178. [2022-11-23 15:54:56,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13178 states, 8737 states have (on average 1.3263133798786768) internal successors, (11588), 8946 states have internal predecessors, (11588), 2929 states have call successors, (2929), 1494 states have call predecessors, (2929), 1511 states have return successors, (3096), 2857 states have call predecessors, (3096), 2928 states have call successors, (3096) [2022-11-23 15:54:56,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13178 states to 13178 states and 17613 transitions. [2022-11-23 15:54:56,436 INFO L78 Accepts]: Start accepts. Automaton has 13178 states and 17613 transitions. Word has length 110 [2022-11-23 15:54:56,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:54:56,436 INFO L495 AbstractCegarLoop]: Abstraction has 13178 states and 17613 transitions. [2022-11-23 15:54:56,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 2 states have call successors, (11) [2022-11-23 15:54:56,436 INFO L276 IsEmpty]: Start isEmpty. Operand 13178 states and 17613 transitions. [2022-11-23 15:54:56,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-23 15:54:56,460 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:54:56,460 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 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, 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] [2022-11-23 15:54:56,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-23 15:54:56,460 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:54:56,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:54:56,461 INFO L85 PathProgramCache]: Analyzing trace with hash -1651578763, now seen corresponding path program 1 times [2022-11-23 15:54:56,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:54:56,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688001861] [2022-11-23 15:54:56,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:54:56,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:54:56,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:55:00,515 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-23 15:55:00,516 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:55:00,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688001861] [2022-11-23 15:55:00,516 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1688001861] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:55:00,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [682512196] [2022-11-23 15:55:00,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:55:00,517 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:55:00,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:55:00,519 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:55:00,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 15:55:01,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:55:01,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 1501 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-23 15:55:01,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:55:03,431 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-23 15:55:03,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:55:06,057 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-23 15:55:06,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [682512196] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 15:55:06,058 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:55:06,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [15, 14] total 32 [2022-11-23 15:55:06,059 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642273628] [2022-11-23 15:55:06,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:55:06,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 15:55:06,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:55:06,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 15:55:06,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=876, Unknown=0, NotChecked=0, Total=992 [2022-11-23 15:55:06,061 INFO L87 Difference]: Start difference. First operand 13178 states and 17613 transitions. Second operand has 9 states, 6 states have (on average 12.5) internal successors, (75), 7 states have internal predecessors, (75), 5 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2022-11-23 15:55:14,711 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:55:18,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:55:18,394 INFO L93 Difference]: Finished difference Result 18699 states and 24995 transitions. [2022-11-23 15:55:18,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 15:55:18,395 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 12.5) internal successors, (75), 7 states have internal predecessors, (75), 5 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 125 [2022-11-23 15:55:18,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:55:18,470 INFO L225 Difference]: With dead ends: 18699 [2022-11-23 15:55:18,471 INFO L226 Difference]: Without dead ends: 18408 [2022-11-23 15:55:18,481 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 234 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=123, Invalid=933, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 15:55:18,481 INFO L413 NwaCegarLoop]: 422 mSDtfsCounter, 1484 mSDsluCounter, 971 mSDsCounter, 0 mSdLazyCounter, 2203 mSolverCounterSat, 664 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1543 SdHoareTripleChecker+Valid, 1393 SdHoareTripleChecker+Invalid, 2868 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 664 IncrementalHoareTripleChecker+Valid, 2203 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:55:18,482 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1543 Valid, 1393 Invalid, 2868 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [664 Valid, 2203 Invalid, 1 Unknown, 0 Unchecked, 9.2s Time] [2022-11-23 15:55:18,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18408 states. [2022-11-23 15:55:21,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18408 to 13178. [2022-11-23 15:55:21,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13178 states, 8737 states have (on average 1.3263133798786768) internal successors, (11588), 8946 states have internal predecessors, (11588), 2929 states have call successors, (2929), 1494 states have call predecessors, (2929), 1511 states have return successors, (3096), 2857 states have call predecessors, (3096), 2928 states have call successors, (3096) [2022-11-23 15:55:21,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13178 states to 13178 states and 17613 transitions. [2022-11-23 15:55:21,047 INFO L78 Accepts]: Start accepts. Automaton has 13178 states and 17613 transitions. Word has length 125 [2022-11-23 15:55:21,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:55:21,047 INFO L495 AbstractCegarLoop]: Abstraction has 13178 states and 17613 transitions. [2022-11-23 15:55:21,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 12.5) internal successors, (75), 7 states have internal predecessors, (75), 5 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2022-11-23 15:55:21,047 INFO L276 IsEmpty]: Start isEmpty. Operand 13178 states and 17613 transitions. [2022-11-23 15:55:21,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-23 15:55:21,067 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:55:21,068 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 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, 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] [2022-11-23 15:55:21,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 15:55:21,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-23 15:55:21,279 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:55:21,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:55:21,279 INFO L85 PathProgramCache]: Analyzing trace with hash 510732614, now seen corresponding path program 1 times [2022-11-23 15:55:21,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:55:21,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487480005] [2022-11-23 15:55:21,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:55:21,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:55:21,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:55:22,758 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 15 proven. 57 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-23 15:55:22,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:55:22,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487480005] [2022-11-23 15:55:22,759 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487480005] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:55:22,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828496631] [2022-11-23 15:55:22,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:55:22,759 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:55:22,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:55:22,761 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:55:22,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 15:55:23,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:55:23,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 1526 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 15:55:23,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:55:23,872 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 52 proven. 13 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-11-23 15:55:23,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:55:24,104 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-23 15:55:24,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828496631] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 15:55:24,104 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:55:24,104 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10, 7] total 18 [2022-11-23 15:55:24,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436978857] [2022-11-23 15:55:24,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:55:24,105 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 15:55:24,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:55:24,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 15:55:24,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2022-11-23 15:55:24,106 INFO L87 Difference]: Start difference. First operand 13178 states and 17613 transitions. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 states have internal predecessors, (74), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-23 15:55:29,307 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:55:31,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:55:31,669 INFO L93 Difference]: Finished difference Result 29982 states and 40445 transitions. [2022-11-23 15:55:31,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 15:55:31,670 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 states have internal predecessors, (74), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 125 [2022-11-23 15:55:31,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:55:31,755 INFO L225 Difference]: With dead ends: 29982 [2022-11-23 15:55:31,755 INFO L226 Difference]: Without dead ends: 17547 [2022-11-23 15:55:31,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 246 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2022-11-23 15:55:31,799 INFO L413 NwaCegarLoop]: 681 mSDtfsCounter, 552 mSDsluCounter, 1206 mSDsCounter, 0 mSdLazyCounter, 628 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 1887 SdHoareTripleChecker+Invalid, 644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 628 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:55:31,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [566 Valid, 1887 Invalid, 644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 628 Invalid, 1 Unknown, 0 Unchecked, 4.4s Time] [2022-11-23 15:55:31,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17547 states. [2022-11-23 15:55:34,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17547 to 15998. [2022-11-23 15:55:34,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15998 states, 10657 states have (on average 1.33029933377123) internal successors, (14177), 10898 states have internal predecessors, (14177), 3509 states have call successors, (3509), 1814 states have call predecessors, (3509), 1831 states have return successors, (3676), 3425 states have call predecessors, (3676), 3508 states have call successors, (3676) [2022-11-23 15:55:35,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15998 states to 15998 states and 21362 transitions. [2022-11-23 15:55:35,036 INFO L78 Accepts]: Start accepts. Automaton has 15998 states and 21362 transitions. Word has length 125 [2022-11-23 15:55:35,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:55:35,037 INFO L495 AbstractCegarLoop]: Abstraction has 15998 states and 21362 transitions. [2022-11-23 15:55:35,037 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 states have internal predecessors, (74), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-23 15:55:35,037 INFO L276 IsEmpty]: Start isEmpty. Operand 15998 states and 21362 transitions. [2022-11-23 15:55:35,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2022-11-23 15:55:35,066 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:55:35,066 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 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, 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] [2022-11-23 15:55:35,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 15:55:35,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 15:55:35,278 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:55:35,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:55:35,279 INFO L85 PathProgramCache]: Analyzing trace with hash 269932968, now seen corresponding path program 1 times [2022-11-23 15:55:35,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:55:35,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95283765] [2022-11-23 15:55:35,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:55:35,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:55:35,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:55:35,517 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-23 15:55:35,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:55:35,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95283765] [2022-11-23 15:55:35,517 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95283765] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:55:35,518 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:55:35,518 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 15:55:35,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931294610] [2022-11-23 15:55:35,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:55:35,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:55:35,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:55:35,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:55:35,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:55:35,522 INFO L87 Difference]: Start difference. First operand 15998 states and 21362 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2022-11-23 15:55:40,220 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:55:42,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:55:42,870 INFO L93 Difference]: Finished difference Result 37976 states and 52315 transitions. [2022-11-23 15:55:42,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:55:42,871 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 139 [2022-11-23 15:55:42,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:55:42,961 INFO L225 Difference]: With dead ends: 37976 [2022-11-23 15:55:42,961 INFO L226 Difference]: Without dead ends: 22721 [2022-11-23 15:55:43,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 15:55:43,005 INFO L413 NwaCegarLoop]: 664 mSDtfsCounter, 179 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 1194 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:55:43,006 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 1194 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 208 Invalid, 1 Unknown, 0 Unchecked, 3.7s Time] [2022-11-23 15:55:43,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22721 states. [2022-11-23 15:55:46,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22721 to 16154. [2022-11-23 15:55:46,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16154 states, 10753 states have (on average 1.3284664744722403) internal successors, (14285), 10994 states have internal predecessors, (14285), 3569 states have call successors, (3569), 1814 states have call predecessors, (3569), 1831 states have return successors, (3742), 3485 states have call predecessors, (3742), 3568 states have call successors, (3742) [2022-11-23 15:55:46,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16154 states to 16154 states and 21596 transitions. [2022-11-23 15:55:46,605 INFO L78 Accepts]: Start accepts. Automaton has 16154 states and 21596 transitions. Word has length 139 [2022-11-23 15:55:46,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:55:46,606 INFO L495 AbstractCegarLoop]: Abstraction has 16154 states and 21596 transitions. [2022-11-23 15:55:46,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2022-11-23 15:55:46,607 INFO L276 IsEmpty]: Start isEmpty. Operand 16154 states and 21596 transitions. [2022-11-23 15:55:46,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2022-11-23 15:55:46,627 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:55:46,627 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 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, 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] [2022-11-23 15:55:46,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-11-23 15:55:46,628 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:55:46,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:55:46,628 INFO L85 PathProgramCache]: Analyzing trace with hash 1549066949, now seen corresponding path program 1 times [2022-11-23 15:55:46,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:55:46,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237010608] [2022-11-23 15:55:46,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:55:46,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:55:46,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:55:46,938 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 1 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-23 15:55:46,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:55:46,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237010608] [2022-11-23 15:55:46,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1237010608] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:55:46,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645572683] [2022-11-23 15:55:46,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:55:46,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:55:46,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:55:46,943 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:55:46,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 15:55:47,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:55:47,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 1727 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 15:55:47,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:55:47,866 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2022-11-23 15:55:47,866 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:55:47,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645572683] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:55:47,867 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 15:55:47,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2022-11-23 15:55:47,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426695398] [2022-11-23 15:55:47,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:55:47,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:55:47,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:55:47,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:55:47,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 15:55:47,872 INFO L87 Difference]: Start difference. First operand 16154 states and 21596 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 2 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2022-11-23 15:55:52,278 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:55:55,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:55:55,015 INFO L93 Difference]: Finished difference Result 35144 states and 47853 transitions. [2022-11-23 15:55:55,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:55:55,016 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 2 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 150 [2022-11-23 15:55:55,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:55:55,092 INFO L225 Difference]: With dead ends: 35144 [2022-11-23 15:55:55,092 INFO L226 Difference]: Without dead ends: 19733 [2022-11-23 15:55:55,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 15:55:55,133 INFO L413 NwaCegarLoop]: 756 mSDtfsCounter, 169 mSDsluCounter, 565 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 1321 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-23 15:55:55,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 1321 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 220 Invalid, 1 Unknown, 0 Unchecked, 3.5s Time] [2022-11-23 15:55:55,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19733 states. [2022-11-23 15:55:58,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19733 to 16160. [2022-11-23 15:55:58,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16160 states, 10759 states have (on average 1.3282832977042476) internal successors, (14291), 11000 states have internal predecessors, (14291), 3569 states have call successors, (3569), 1814 states have call predecessors, (3569), 1831 states have return successors, (3742), 3485 states have call predecessors, (3742), 3568 states have call successors, (3742) [2022-11-23 15:55:58,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16160 states to 16160 states and 21602 transitions. [2022-11-23 15:55:58,588 INFO L78 Accepts]: Start accepts. Automaton has 16160 states and 21602 transitions. Word has length 150 [2022-11-23 15:55:58,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:55:58,588 INFO L495 AbstractCegarLoop]: Abstraction has 16160 states and 21602 transitions. [2022-11-23 15:55:58,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 2 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2022-11-23 15:55:58,589 INFO L276 IsEmpty]: Start isEmpty. Operand 16160 states and 21602 transitions. [2022-11-23 15:55:58,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-11-23 15:55:58,617 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:55:58,618 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 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, 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] [2022-11-23 15:55:58,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 15:55:58,825 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-23 15:55:58,825 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:55:58,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:55:58,826 INFO L85 PathProgramCache]: Analyzing trace with hash 944503728, now seen corresponding path program 1 times [2022-11-23 15:55:58,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:55:58,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971801157] [2022-11-23 15:55:58,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:55:58,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:55:58,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:00,366 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 57 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-23 15:56:00,367 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:00,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971801157] [2022-11-23 15:56:00,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971801157] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:00,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843678542] [2022-11-23 15:56:00,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:00,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:00,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:00,383 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:00,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 15:56:01,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:01,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 1675 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 15:56:01,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:01,737 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 64 proven. 13 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-11-23 15:56:01,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:02,095 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-11-23 15:56:02,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843678542] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:02,096 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:56:02,096 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10, 10] total 23 [2022-11-23 15:56:02,097 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685126725] [2022-11-23 15:56:02,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:56:02,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 15:56:02,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:02,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 15:56:02,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2022-11-23 15:56:02,099 INFO L87 Difference]: Start difference. First operand 16160 states and 21602 transitions. Second operand has 7 states, 7 states have (on average 12.428571428571429) internal successors, (87), 7 states have internal predecessors, (87), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 4 states have call predecessors, (15), 4 states have call successors, (15) [2022-11-23 15:56:09,481 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:56:13,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:13,959 INFO L93 Difference]: Finished difference Result 39070 states and 53292 transitions. [2022-11-23 15:56:13,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 15:56:13,959 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 12.428571428571429) internal successors, (87), 7 states have internal predecessors, (87), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 4 states have call predecessors, (15), 4 states have call successors, (15) Word has length 154 [2022-11-23 15:56:13,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:14,045 INFO L225 Difference]: With dead ends: 39070 [2022-11-23 15:56:14,045 INFO L226 Difference]: Without dead ends: 23653 [2022-11-23 15:56:14,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=132, Invalid=570, Unknown=0, NotChecked=0, Total=702 [2022-11-23 15:56:14,084 INFO L413 NwaCegarLoop]: 683 mSDtfsCounter, 970 mSDsluCounter, 1769 mSDsCounter, 0 mSdLazyCounter, 1576 mSolverCounterSat, 124 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 974 SdHoareTripleChecker+Valid, 2452 SdHoareTripleChecker+Invalid, 1701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 1576 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:14,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [974 Valid, 2452 Invalid, 1701 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 1576 Invalid, 1 Unknown, 0 Unchecked, 6.7s Time] [2022-11-23 15:56:14,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23653 states. [2022-11-23 15:56:17,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23653 to 16244. [2022-11-23 15:56:17,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16244 states, 10831 states have (on average 1.3272089373095743) internal successors, (14375), 11072 states have internal predecessors, (14375), 3581 states have call successors, (3581), 1814 states have call predecessors, (3581), 1831 states have return successors, (3754), 3497 states have call predecessors, (3754), 3580 states have call successors, (3754) [2022-11-23 15:56:17,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16244 states to 16244 states and 21710 transitions. [2022-11-23 15:56:17,853 INFO L78 Accepts]: Start accepts. Automaton has 16244 states and 21710 transitions. Word has length 154 [2022-11-23 15:56:17,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:17,853 INFO L495 AbstractCegarLoop]: Abstraction has 16244 states and 21710 transitions. [2022-11-23 15:56:17,854 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 12.428571428571429) internal successors, (87), 7 states have internal predecessors, (87), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 4 states have call predecessors, (15), 4 states have call successors, (15) [2022-11-23 15:56:17,854 INFO L276 IsEmpty]: Start isEmpty. Operand 16244 states and 21710 transitions. [2022-11-23 15:56:17,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-11-23 15:56:17,867 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:17,867 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 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, 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] [2022-11-23 15:56:17,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:18,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:18,068 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:18,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:18,069 INFO L85 PathProgramCache]: Analyzing trace with hash -970725581, now seen corresponding path program 1 times [2022-11-23 15:56:18,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:18,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003218503] [2022-11-23 15:56:18,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:18,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:18,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:18,886 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-23 15:56:18,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:18,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003218503] [2022-11-23 15:56:18,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003218503] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:56:18,887 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:56:18,887 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-23 15:56:18,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996602060] [2022-11-23 15:56:18,888 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:56:18,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 15:56:18,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:18,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 15:56:18,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-23 15:56:18,889 INFO L87 Difference]: Start difference. First operand 16244 states and 21710 transitions. Second operand has 7 states, 6 states have (on average 15.5) internal successors, (93), 5 states have internal predecessors, (93), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 4 states have call predecessors, (21), 2 states have call successors, (21) [2022-11-23 15:56:25,079 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:56:28,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:28,959 INFO L93 Difference]: Finished difference Result 38520 states and 53303 transitions. [2022-11-23 15:56:28,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 15:56:28,960 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 15.5) internal successors, (93), 5 states have internal predecessors, (93), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 4 states have call predecessors, (21), 2 states have call successors, (21) Word has length 157 [2022-11-23 15:56:28,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:29,013 INFO L225 Difference]: With dead ends: 38520 [2022-11-23 15:56:29,014 INFO L226 Difference]: Without dead ends: 23019 [2022-11-23 15:56:29,045 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-23 15:56:29,046 INFO L413 NwaCegarLoop]: 765 mSDtfsCounter, 172 mSDsluCounter, 3608 mSDsCounter, 0 mSdLazyCounter, 738 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 4373 SdHoareTripleChecker+Invalid, 739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 738 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:29,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 4373 Invalid, 739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 738 Invalid, 1 Unknown, 0 Unchecked, 5.6s Time] [2022-11-23 15:56:29,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23019 states. [2022-11-23 15:56:32,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23019 to 16280. [2022-11-23 15:56:32,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16280 states, 10861 states have (on average 1.3263051284412117) internal successors, (14405), 11090 states have internal predecessors, (14405), 3581 states have call successors, (3581), 1814 states have call predecessors, (3581), 1837 states have return successors, (3766), 3515 states have call predecessors, (3766), 3580 states have call successors, (3766) [2022-11-23 15:56:32,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16280 states to 16280 states and 21752 transitions. [2022-11-23 15:56:32,450 INFO L78 Accepts]: Start accepts. Automaton has 16280 states and 21752 transitions. Word has length 157 [2022-11-23 15:56:32,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:32,451 INFO L495 AbstractCegarLoop]: Abstraction has 16280 states and 21752 transitions. [2022-11-23 15:56:32,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 15.5) internal successors, (93), 5 states have internal predecessors, (93), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 4 states have call predecessors, (21), 2 states have call successors, (21) [2022-11-23 15:56:32,451 INFO L276 IsEmpty]: Start isEmpty. Operand 16280 states and 21752 transitions. [2022-11-23 15:56:32,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-11-23 15:56:32,464 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:32,464 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 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, 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] [2022-11-23 15:56:32,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-11-23 15:56:32,464 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:32,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:32,465 INFO L85 PathProgramCache]: Analyzing trace with hash 371279014, now seen corresponding path program 1 times [2022-11-23 15:56:32,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:32,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237911846] [2022-11-23 15:56:32,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:32,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:32,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:35,052 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-23 15:56:35,052 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:35,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237911846] [2022-11-23 15:56:35,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1237911846] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:56:35,053 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:56:35,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-11-23 15:56:35,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091018284] [2022-11-23 15:56:35,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:56:35,054 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-23 15:56:35,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:35,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-23 15:56:35,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2022-11-23 15:56:35,055 INFO L87 Difference]: Start difference. First operand 16280 states and 21752 transitions. Second operand has 10 states, 7 states have (on average 13.0) internal successors, (91), 8 states have internal predecessors, (91), 5 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2022-11-23 15:56:47,403 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:56:56,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:56,395 INFO L93 Difference]: Finished difference Result 28154 states and 38262 transitions. [2022-11-23 15:56:56,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 15:56:56,395 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 7 states have (on average 13.0) internal successors, (91), 8 states have internal predecessors, (91), 5 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 161 [2022-11-23 15:56:56,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:56,472 INFO L225 Difference]: With dead ends: 28154 [2022-11-23 15:56:56,473 INFO L226 Difference]: Without dead ends: 27863 [2022-11-23 15:56:56,481 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2022-11-23 15:56:56,482 INFO L413 NwaCegarLoop]: 436 mSDtfsCounter, 893 mSDsluCounter, 1846 mSDsCounter, 0 mSdLazyCounter, 4174 mSolverCounterSat, 371 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1013 SdHoareTripleChecker+Valid, 2282 SdHoareTripleChecker+Invalid, 4546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 371 IncrementalHoareTripleChecker+Valid, 4174 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.8s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:56,482 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1013 Valid, 2282 Invalid, 4546 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [371 Valid, 4174 Invalid, 1 Unknown, 0 Unchecked, 14.8s Time] [2022-11-23 15:56:56,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27863 states. [2022-11-23 15:57:02,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27863 to 24555. [2022-11-23 15:57:02,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24555 states, 16432 states have (on average 1.3272273612463485) internal successors, (21809), 16774 states have internal predecessors, (21809), 5330 states have call successors, (5330), 2751 states have call predecessors, (5330), 2792 states have return successors, (5587), 5221 states have call predecessors, (5587), 5329 states have call successors, (5587) [2022-11-23 15:57:02,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24555 states to 24555 states and 32726 transitions. [2022-11-23 15:57:02,089 INFO L78 Accepts]: Start accepts. Automaton has 24555 states and 32726 transitions. Word has length 161 [2022-11-23 15:57:02,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:57:02,090 INFO L495 AbstractCegarLoop]: Abstraction has 24555 states and 32726 transitions. [2022-11-23 15:57:02,090 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 7 states have (on average 13.0) internal successors, (91), 8 states have internal predecessors, (91), 5 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2022-11-23 15:57:02,090 INFO L276 IsEmpty]: Start isEmpty. Operand 24555 states and 32726 transitions. [2022-11-23 15:57:02,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2022-11-23 15:57:02,120 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:57:02,120 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:57:02,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-11-23 15:57:02,121 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:57:02,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:57:02,121 INFO L85 PathProgramCache]: Analyzing trace with hash 78922955, now seen corresponding path program 1 times [2022-11-23 15:57:02,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:57:02,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125573531] [2022-11-23 15:57:02,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:57:02,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:57:02,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:57:03,779 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 15 proven. 57 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-23 15:57:03,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:57:03,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125573531] [2022-11-23 15:57:03,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125573531] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:57:03,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786671781] [2022-11-23 15:57:03,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:57:03,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:57:03,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:57:03,782 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:57:03,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0691fc0c-bc60-444e-9954-16274f4d113d/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 15:57:04,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:57:04,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 2064 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-23 15:57:04,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:57:05,430 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 74 proven. 13 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-23 15:57:05,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:57:06,161 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2022-11-23 15:57:06,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786671781] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 15:57:06,162 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:57:06,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [10, 13] total 29 [2022-11-23 15:57:06,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818868725] [2022-11-23 15:57:06,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:57:06,163 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-23 15:57:06,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:57:06,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-23 15:57:06,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=685, Unknown=0, NotChecked=0, Total=812 [2022-11-23 15:57:06,165 INFO L87 Difference]: Start difference. First operand 24555 states and 32726 transitions. Second operand has 10 states, 9 states have (on average 12.222222222222221) internal successors, (110), 9 states have internal predecessors, (110), 5 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (25), 6 states have call predecessors, (25), 5 states have call successors, (25) [2022-11-23 15:57:15,464 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-23 15:57:33,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:57:33,236 INFO L93 Difference]: Finished difference Result 87930 states and 125884 transitions. [2022-11-23 15:57:33,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-23 15:57:33,240 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 12.222222222222221) internal successors, (110), 9 states have internal predecessors, (110), 5 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (25), 6 states have call predecessors, (25), 5 states have call successors, (25) Word has length 205 [2022-11-23 15:57:33,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:57:33,578 INFO L225 Difference]: With dead ends: 87930 [2022-11-23 15:57:33,578 INFO L226 Difference]: Without dead ends: 65869 [2022-11-23 15:57:33,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 404 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 689 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=337, Invalid=1919, Unknown=0, NotChecked=0, Total=2256 [2022-11-23 15:57:33,627 INFO L413 NwaCegarLoop]: 1117 mSDtfsCounter, 1444 mSDsluCounter, 3658 mSDsCounter, 0 mSdLazyCounter, 4654 mSolverCounterSat, 570 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1471 SdHoareTripleChecker+Valid, 4775 SdHoareTripleChecker+Invalid, 5225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 570 IncrementalHoareTripleChecker+Valid, 4654 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:57:33,628 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1471 Valid, 4775 Invalid, 5225 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [570 Valid, 4654 Invalid, 1 Unknown, 0 Unchecked, 12.3s Time] [2022-11-23 15:57:33,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65869 states.