./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_unsafes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--ppp--ppp_synctty.ko-entry_point.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_unsafes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--ppp--ppp_synctty.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta --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 389f662f7096bd36438270dc54f296be4073de8eeb864b893c17044d6fb4cc06 --- 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-dbf71c6-m [2022-10-17 17:39:52,130 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:39:52,133 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:39:52,169 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:39:52,169 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:39:52,171 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:39:52,173 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:39:52,175 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:39:52,180 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:39:52,185 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:39:52,186 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:39:52,189 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:39:52,191 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:39:52,194 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:39:52,196 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:39:52,198 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:39:52,200 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:39:52,206 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:39:52,208 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:39:52,211 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:39:52,217 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:39:52,221 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:39:52,223 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:39:52,227 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:39:52,234 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:39:52,240 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:39:52,241 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:39:52,242 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:39:52,244 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:39:52,245 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:39:52,245 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:39:52,246 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:39:52,247 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:39:52,248 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:39:52,249 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:39:52,249 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:39:52,250 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:39:52,250 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:39:52,250 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:39:52,251 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:39:52,251 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:39:52,253 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/config/svcomp-Reach-64bit-Taipan_Default.epf [2022-10-17 17:39:52,305 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:39:52,306 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:39:52,307 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:39:52,307 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:39:52,308 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:39:52,308 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:39:52,308 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:39:52,309 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:39:52,309 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:39:52,309 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:39:52,310 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:39:52,311 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:39:52,311 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:39:52,311 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:39:52,311 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:39:52,312 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:39:52,312 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:39:52,312 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:39:52,313 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:39:52,314 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:39:52,315 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:39:52,315 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-17 17:39:52,315 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:39:52,316 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-17 17:39:52,316 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-17 17:39:52,316 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:39:52,316 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-17 17:39:52,317 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:39:52,317 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:39:52,317 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:39:52,317 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:39:52,318 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:39:52,318 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:39:52,318 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-17 17:39:52,318 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:39:52,319 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:39:52,319 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-17 17:39:52,319 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:39:52,319 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_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 389f662f7096bd36438270dc54f296be4073de8eeb864b893c17044d6fb4cc06 [2022-10-17 17:39:52,616 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:39:52,640 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:39:52,642 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:39:52,644 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:39:52,645 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:39:52,646 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_unsafes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--ppp--ppp_synctty.ko-entry_point.cil.out.i [2022-10-17 17:39:52,720 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/data/d57a76a29/26a1a38c18aa4b908e9d9f5c915819bd/FLAGe6417a2d3 [2022-10-17 17:39:53,572 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:39:53,572 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_unsafes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--ppp--ppp_synctty.ko-entry_point.cil.out.i [2022-10-17 17:39:53,610 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/data/d57a76a29/26a1a38c18aa4b908e9d9f5c915819bd/FLAGe6417a2d3 [2022-10-17 17:39:54,112 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/data/d57a76a29/26a1a38c18aa4b908e9d9f5c915819bd [2022-10-17 17:39:54,114 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:39:54,116 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:39:54,117 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:39:54,118 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:39:54,121 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:39:54,122 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:39:54" (1/1) ... [2022-10-17 17:39:54,123 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76d07a4a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:54, skipping insertion in model container [2022-10-17 17:39:54,124 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:39:54" (1/1) ... [2022-10-17 17:39:54,131 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:39:54,247 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:39:55,466 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_unsafes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--ppp--ppp_synctty.ko-entry_point.cil.out.i[163507,163520] [2022-10-17 17:39:55,868 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:39:55,887 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:39:56,038 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_unsafes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--ppp--ppp_synctty.ko-entry_point.cil.out.i[163507,163520] [2022-10-17 17:39:56,202 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:39:56,354 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:39:56,355 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56 WrapperNode [2022-10-17 17:39:56,355 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:39:56,356 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:39:56,356 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:39:56,357 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:39:56,366 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,411 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,501 INFO L138 Inliner]: procedures = 176, calls = 448, calls flagged for inlining = 92, calls inlined = 85, statements flattened = 1769 [2022-10-17 17:39:56,501 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:39:56,502 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:39:56,502 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:39:56,502 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:39:56,513 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,576 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,577 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,677 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,706 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,727 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,756 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:39:56,757 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:39:56,757 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:39:56,757 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:39:56,758 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (1/1) ... [2022-10-17 17:39:56,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:39:56,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:39:56,789 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:39:56,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:39:56,842 INFO L130 BoogieDeclarations]: Found specification of procedure __raw_spin_lock_init [2022-10-17 17:39:56,843 INFO L138 BoogieDeclarations]: Found implementation of procedure __raw_spin_lock_init [2022-10-17 17:39:56,843 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_dev_alloc_skb_15 [2022-10-17 17:39:56,843 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_dev_alloc_skb_15 [2022-10-17 17:39:56,843 INFO L130 BoogieDeclarations]: Found specification of procedure ppp_sync_poll [2022-10-17 17:39:56,843 INFO L138 BoogieDeclarations]: Found implementation of procedure ppp_sync_poll [2022-10-17 17:39:56,843 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2022-10-17 17:39:56,843 INFO L130 BoogieDeclarations]: Found specification of procedure skb_reserve [2022-10-17 17:39:56,844 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_reserve [2022-10-17 17:39:56,844 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2022-10-17 17:39:56,844 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2022-10-17 17:39:56,844 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2022-10-17 17:39:56,844 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2022-10-17 17:39:56,844 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-10-17 17:39:56,844 INFO L130 BoogieDeclarations]: Found specification of procedure skb_push [2022-10-17 17:39:56,844 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_push [2022-10-17 17:39:56,845 INFO L130 BoogieDeclarations]: Found specification of procedure ppp_output_wakeup [2022-10-17 17:39:56,845 INFO L138 BoogieDeclarations]: Found implementation of procedure ppp_output_wakeup [2022-10-17 17:39:56,845 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memcpy [2022-10-17 17:39:56,845 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memcpy [2022-10-17 17:39:56,845 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_skb_free [2022-10-17 17:39:56,845 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_skb_free [2022-10-17 17:39:56,845 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2022-10-17 17:39:56,846 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2022-10-17 17:39:56,846 INFO L130 BoogieDeclarations]: Found specification of procedure spin_trylock_bh [2022-10-17 17:39:56,846 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_trylock_bh [2022-10-17 17:39:56,846 INFO L130 BoogieDeclarations]: Found specification of procedure constant_test_bit [2022-10-17 17:39:56,846 INFO L138 BoogieDeclarations]: Found implementation of procedure constant_test_bit [2022-10-17 17:39:56,846 INFO L130 BoogieDeclarations]: Found specification of procedure skb_trim [2022-10-17 17:39:56,846 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_trim [2022-10-17 17:39:56,847 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_skb_alloc [2022-10-17 17:39:56,847 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_skb_alloc [2022-10-17 17:39:56,847 INFO L130 BoogieDeclarations]: Found specification of procedure ppp_synctty_ioctl [2022-10-17 17:39:56,847 INFO L138 BoogieDeclarations]: Found implementation of procedure ppp_synctty_ioctl [2022-10-17 17:39:56,847 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2022-10-17 17:39:56,847 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2022-10-17 17:39:56,847 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-10-17 17:39:56,847 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2022-10-17 17:39:56,848 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2022-10-17 17:39:56,848 INFO L130 BoogieDeclarations]: Found specification of procedure skb_pull [2022-10-17 17:39:56,848 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_pull [2022-10-17 17:39:56,848 INFO L130 BoogieDeclarations]: Found specification of procedure ppp_sync_close [2022-10-17 17:39:56,848 INFO L138 BoogieDeclarations]: Found implementation of procedure ppp_sync_close [2022-10-17 17:39:56,848 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2022-10-17 17:39:56,848 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2022-10-17 17:39:56,849 INFO L130 BoogieDeclarations]: Found specification of procedure clear_bit [2022-10-17 17:39:56,849 INFO L138 BoogieDeclarations]: Found implementation of procedure clear_bit [2022-10-17 17:39:56,849 INFO L130 BoogieDeclarations]: Found specification of procedure ppp_print_buffer [2022-10-17 17:39:56,849 INFO L138 BoogieDeclarations]: Found implementation of procedure ppp_print_buffer [2022-10-17 17:39:56,849 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-10-17 17:39:56,849 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-10-17 17:39:56,849 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-10-17 17:39:56,849 INFO L130 BoogieDeclarations]: Found specification of procedure test_and_set_bit [2022-10-17 17:39:56,850 INFO L138 BoogieDeclarations]: Found implementation of procedure test_and_set_bit [2022-10-17 17:39:56,850 INFO L130 BoogieDeclarations]: Found specification of procedure spinlock_check [2022-10-17 17:39:56,850 INFO L138 BoogieDeclarations]: Found implementation of procedure spinlock_check [2022-10-17 17:39:56,850 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:39:56,850 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-10-17 17:39:56,850 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-10-17 17:39:56,850 INFO L130 BoogieDeclarations]: Found specification of procedure _copy_to_user [2022-10-17 17:39:56,850 INFO L138 BoogieDeclarations]: Found implementation of procedure _copy_to_user [2022-10-17 17:39:56,851 INFO L130 BoogieDeclarations]: Found specification of procedure tasklet_schedule [2022-10-17 17:39:56,851 INFO L138 BoogieDeclarations]: Found implementation of procedure tasklet_schedule [2022-10-17 17:39:56,851 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-10-17 17:39:56,851 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_set_remove [2022-10-17 17:39:56,851 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_set_remove [2022-10-17 17:39:56,851 INFO L130 BoogieDeclarations]: Found specification of procedure atomic_dec_and_test [2022-10-17 17:39:56,851 INFO L138 BoogieDeclarations]: Found implementation of procedure atomic_dec_and_test [2022-10-17 17:39:56,851 INFO L130 BoogieDeclarations]: Found specification of procedure sp_put [2022-10-17 17:39:56,852 INFO L138 BoogieDeclarations]: Found implementation of procedure sp_put [2022-10-17 17:39:56,852 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-10-17 17:39:56,852 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-10-17 17:39:56,852 INFO L130 BoogieDeclarations]: Found specification of procedure skb_queue_tail [2022-10-17 17:39:56,852 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_queue_tail [2022-10-17 17:39:56,852 INFO L130 BoogieDeclarations]: Found specification of procedure ppp_sync_hangup [2022-10-17 17:39:56,852 INFO L138 BoogieDeclarations]: Found implementation of procedure ppp_sync_hangup [2022-10-17 17:39:56,852 INFO L130 BoogieDeclarations]: Found specification of procedure might_fault [2022-10-17 17:39:56,853 INFO L138 BoogieDeclarations]: Found implementation of procedure might_fault [2022-10-17 17:39:56,853 INFO L130 BoogieDeclarations]: Found specification of procedure skb_put [2022-10-17 17:39:56,853 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_put [2022-10-17 17:39:56,853 INFO L130 BoogieDeclarations]: Found specification of procedure sp_get [2022-10-17 17:39:56,853 INFO L138 BoogieDeclarations]: Found implementation of procedure sp_get [2022-10-17 17:39:56,853 INFO L130 BoogieDeclarations]: Found specification of procedure set_bit [2022-10-17 17:39:56,853 INFO L138 BoogieDeclarations]: Found implementation of procedure set_bit [2022-10-17 17:39:56,853 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:39:56,854 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock_bh [2022-10-17 17:39:56,854 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock_bh [2022-10-17 17:39:56,854 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~int [2022-10-17 17:39:56,854 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_zalloc [2022-10-17 17:39:56,854 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_zalloc [2022-10-17 17:39:56,854 INFO L130 BoogieDeclarations]: Found specification of procedure _copy_from_user [2022-10-17 17:39:56,854 INFO L138 BoogieDeclarations]: Found implementation of procedure _copy_from_user [2022-10-17 17:39:56,854 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:39:56,854 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:39:56,855 INFO L130 BoogieDeclarations]: Found specification of procedure ppp_sync_push [2022-10-17 17:39:56,855 INFO L138 BoogieDeclarations]: Found implementation of procedure ppp_sync_push [2022-10-17 17:39:57,335 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:39:57,338 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:39:57,423 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2022-10-17 17:39:59,008 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:39:59,616 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:39:59,617 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-10-17 17:39:59,622 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:39:59 BoogieIcfgContainer [2022-10-17 17:39:59,623 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:39:59,626 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:39:59,626 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:39:59,630 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:39:59,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:39:54" (1/3) ... [2022-10-17 17:39:59,631 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1798169c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:39:59, skipping insertion in model container [2022-10-17 17:39:59,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:39:56" (2/3) ... [2022-10-17 17:39:59,633 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1798169c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:39:59, skipping insertion in model container [2022-10-17 17:39:59,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:39:59" (3/3) ... [2022-10-17 17:39:59,639 INFO L112 eAbstractionObserver]: Analyzing ICFG 205_9a_array_unsafes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--ppp--ppp_synctty.ko-entry_point.cil.out.i [2022-10-17 17:39:59,660 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:39:59,660 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-10-17 17:39:59,756 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:39:59,764 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;@70cb1912, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:39:59,764 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-10-17 17:39:59,773 INFO L276 IsEmpty]: Start isEmpty. Operand has 446 states, 285 states have (on average 1.3929824561403508) internal successors, (397), 301 states have internal predecessors, (397), 120 states have call successors, (120), 40 states have call predecessors, (120), 39 states have return successors, (116), 114 states have call predecessors, (116), 116 states have call successors, (116) [2022-10-17 17:39:59,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-10-17 17:39:59,799 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:39:59,799 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:39:59,800 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:39:59,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:39:59,808 INFO L85 PathProgramCache]: Analyzing trace with hash -1989573905, now seen corresponding path program 1 times [2022-10-17 17:39:59,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:39:59,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713203686] [2022-10-17 17:39:59,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:39:59,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:00,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:00,518 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-10-17 17:40:00,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:00,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713203686] [2022-10-17 17:40:00,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713203686] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:00,520 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:00,520 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:00,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885183956] [2022-10-17 17:40:00,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:00,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:00,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:00,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:00,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:00,574 INFO L87 Difference]: Start difference. First operand has 446 states, 285 states have (on average 1.3929824561403508) internal successors, (397), 301 states have internal predecessors, (397), 120 states have call successors, (120), 40 states have call predecessors, (120), 39 states have return successors, (116), 114 states have call predecessors, (116), 116 states have call successors, (116) 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, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2022-10-17 17:40:01,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:01,815 INFO L93 Difference]: Finished difference Result 1282 states and 1859 transitions. [2022-10-17 17:40:01,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:01,818 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, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) Word has length 71 [2022-10-17 17:40:01,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:01,840 INFO L225 Difference]: With dead ends: 1282 [2022-10-17 17:40:01,841 INFO L226 Difference]: Without dead ends: 845 [2022-10-17 17:40:01,850 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 [2022-10-17 17:40:01,854 INFO L413 NwaCegarLoop]: 650 mSDtfsCounter, 575 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 575 SdHoareTripleChecker+Valid, 1187 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:01,855 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [575 Valid, 1187 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-10-17 17:40:01,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 845 states. [2022-10-17 17:40:01,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 845 to 845. [2022-10-17 17:40:01,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 845 states, 549 states have (on average 1.3679417122040072) internal successors, (751), 569 states have internal predecessors, (751), 219 states have call successors, (219), 77 states have call predecessors, (219), 76 states have return successors, (218), 214 states have call predecessors, (218), 218 states have call successors, (218) [2022-10-17 17:40:02,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 845 states to 845 states and 1188 transitions. [2022-10-17 17:40:02,005 INFO L78 Accepts]: Start accepts. Automaton has 845 states and 1188 transitions. Word has length 71 [2022-10-17 17:40:02,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:02,006 INFO L495 AbstractCegarLoop]: Abstraction has 845 states and 1188 transitions. [2022-10-17 17:40:02,006 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, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2022-10-17 17:40:02,007 INFO L276 IsEmpty]: Start isEmpty. Operand 845 states and 1188 transitions. [2022-10-17 17:40:02,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-10-17 17:40:02,018 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:02,018 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:02,018 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:40:02,019 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:02,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:02,020 INFO L85 PathProgramCache]: Analyzing trace with hash -1681378147, now seen corresponding path program 1 times [2022-10-17 17:40:02,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:02,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717546528] [2022-10-17 17:40:02,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:02,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:02,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:02,403 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-10-17 17:40:02,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:02,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717546528] [2022-10-17 17:40:02,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717546528] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:02,404 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:02,404 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 17:40:02,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046464511] [2022-10-17 17:40:02,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:02,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-10-17 17:40:02,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:02,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-10-17 17:40:02,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-10-17 17:40:02,408 INFO L87 Difference]: Start difference. First operand 845 states and 1188 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2022-10-17 17:40:03,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:03,843 INFO L93 Difference]: Finished difference Result 1669 states and 2383 transitions. [2022-10-17 17:40:03,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-10-17 17:40:03,844 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) Word has length 74 [2022-10-17 17:40:03,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:03,857 INFO L225 Difference]: With dead ends: 1669 [2022-10-17 17:40:03,857 INFO L226 Difference]: Without dead ends: 1664 [2022-10-17 17:40:03,858 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:40:03,859 INFO L413 NwaCegarLoop]: 654 mSDtfsCounter, 601 mSDsluCounter, 1330 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 601 SdHoareTripleChecker+Valid, 1827 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:03,865 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [601 Valid, 1827 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-10-17 17:40:03,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1664 states. [2022-10-17 17:40:03,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1664 to 1656. [2022-10-17 17:40:03,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1656 states, 1076 states have (on average 1.370817843866171) internal successors, (1475), 1116 states have internal predecessors, (1475), 427 states have call successors, (427), 153 states have call predecessors, (427), 152 states have return successors, (464), 418 states have call predecessors, (464), 426 states have call successors, (464) [2022-10-17 17:40:04,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1656 states to 1656 states and 2366 transitions. [2022-10-17 17:40:04,002 INFO L78 Accepts]: Start accepts. Automaton has 1656 states and 2366 transitions. Word has length 74 [2022-10-17 17:40:04,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:04,004 INFO L495 AbstractCegarLoop]: Abstraction has 1656 states and 2366 transitions. [2022-10-17 17:40:04,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2022-10-17 17:40:04,005 INFO L276 IsEmpty]: Start isEmpty. Operand 1656 states and 2366 transitions. [2022-10-17 17:40:04,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-10-17 17:40:04,012 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:04,012 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 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] [2022-10-17 17:40:04,013 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-10-17 17:40:04,013 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:04,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:04,013 INFO L85 PathProgramCache]: Analyzing trace with hash 462867534, now seen corresponding path program 1 times [2022-10-17 17:40:04,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:04,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110934195] [2022-10-17 17:40:04,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:04,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:04,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:04,165 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-10-17 17:40:04,166 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:04,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110934195] [2022-10-17 17:40:04,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110934195] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:04,166 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:04,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:04,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815740270] [2022-10-17 17:40:04,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:04,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:04,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:04,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:04,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:04,169 INFO L87 Difference]: Start difference. First operand 1656 states and 2366 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2022-10-17 17:40:05,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:05,512 INFO L93 Difference]: Finished difference Result 4216 states and 5967 transitions. [2022-10-17 17:40:05,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:05,513 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), 2 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) Word has length 111 [2022-10-17 17:40:05,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:05,532 INFO L225 Difference]: With dead ends: 4216 [2022-10-17 17:40:05,532 INFO L226 Difference]: Without dead ends: 2581 [2022-10-17 17:40:05,539 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 [2022-10-17 17:40:05,540 INFO L413 NwaCegarLoop]: 587 mSDtfsCounter, 348 mSDsluCounter, 551 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 348 SdHoareTripleChecker+Valid, 1061 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:05,541 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [348 Valid, 1061 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-10-17 17:40:05,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2581 states. [2022-10-17 17:40:05,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2581 to 2574. [2022-10-17 17:40:05,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2574 states, 1692 states have (on average 1.3599290780141844) internal successors, (2301), 1738 states have internal predecessors, (2301), 633 states have call successors, (633), 249 states have call predecessors, (633), 248 states have return successors, (688), 622 states have call predecessors, (688), 632 states have call successors, (688) [2022-10-17 17:40:05,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2574 states to 2574 states and 3622 transitions. [2022-10-17 17:40:05,720 INFO L78 Accepts]: Start accepts. Automaton has 2574 states and 3622 transitions. Word has length 111 [2022-10-17 17:40:05,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:05,721 INFO L495 AbstractCegarLoop]: Abstraction has 2574 states and 3622 transitions. [2022-10-17 17:40:05,721 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), 2 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2022-10-17 17:40:05,722 INFO L276 IsEmpty]: Start isEmpty. Operand 2574 states and 3622 transitions. [2022-10-17 17:40:05,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-10-17 17:40:05,729 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:05,730 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 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] [2022-10-17 17:40:05,730 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-10-17 17:40:05,730 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:05,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:05,731 INFO L85 PathProgramCache]: Analyzing trace with hash -581744897, now seen corresponding path program 1 times [2022-10-17 17:40:05,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:05,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695076563] [2022-10-17 17:40:05,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:05,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:05,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:05,882 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-10-17 17:40:05,882 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:05,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695076563] [2022-10-17 17:40:05,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695076563] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:05,883 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:05,883 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:05,883 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240228782] [2022-10-17 17:40:05,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:05,884 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:05,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:05,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:05,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:05,885 INFO L87 Difference]: Start difference. First operand 2574 states and 3622 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 2 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2022-10-17 17:40:07,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:07,500 INFO L93 Difference]: Finished difference Result 6264 states and 8775 transitions. [2022-10-17 17:40:07,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:07,501 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 2 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) Word has length 128 [2022-10-17 17:40:07,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:07,532 INFO L225 Difference]: With dead ends: 6264 [2022-10-17 17:40:07,532 INFO L226 Difference]: Without dead ends: 3711 [2022-10-17 17:40:07,542 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 [2022-10-17 17:40:07,544 INFO L413 NwaCegarLoop]: 772 mSDtfsCounter, 391 mSDsluCounter, 577 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 1269 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:07,544 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [391 Valid, 1269 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-10-17 17:40:07,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3711 states. [2022-10-17 17:40:07,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3711 to 3706. [2022-10-17 17:40:07,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3706 states, 2449 states have (on average 1.3658636178031849) internal successors, (3345), 2531 states have internal predecessors, (3345), 874 states have call successors, (874), 383 states have call predecessors, (874), 382 states have return successors, (953), 855 states have call predecessors, (953), 873 states have call successors, (953) [2022-10-17 17:40:07,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3706 states to 3706 states and 5172 transitions. [2022-10-17 17:40:07,845 INFO L78 Accepts]: Start accepts. Automaton has 3706 states and 5172 transitions. Word has length 128 [2022-10-17 17:40:07,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:07,846 INFO L495 AbstractCegarLoop]: Abstraction has 3706 states and 5172 transitions. [2022-10-17 17:40:07,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 2 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2022-10-17 17:40:07,847 INFO L276 IsEmpty]: Start isEmpty. Operand 3706 states and 5172 transitions. [2022-10-17 17:40:07,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2022-10-17 17:40:07,857 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:07,858 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 3, 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] [2022-10-17 17:40:07,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-10-17 17:40:07,858 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:07,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:07,859 INFO L85 PathProgramCache]: Analyzing trace with hash 321831774, now seen corresponding path program 1 times [2022-10-17 17:40:07,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:07,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589659405] [2022-10-17 17:40:07,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:07,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:07,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:08,044 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2022-10-17 17:40:08,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:08,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589659405] [2022-10-17 17:40:08,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589659405] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:08,045 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:08,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:08,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032345716] [2022-10-17 17:40:08,046 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:08,046 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:08,046 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:08,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:08,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:08,047 INFO L87 Difference]: Start difference. First operand 3706 states and 5172 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2022-10-17 17:40:08,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:08,952 INFO L93 Difference]: Finished difference Result 9110 states and 12673 transitions. [2022-10-17 17:40:08,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:08,961 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 129 [2022-10-17 17:40:08,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:09,001 INFO L225 Difference]: With dead ends: 9110 [2022-10-17 17:40:09,001 INFO L226 Difference]: Without dead ends: 5433 [2022-10-17 17:40:09,014 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 [2022-10-17 17:40:09,017 INFO L413 NwaCegarLoop]: 627 mSDtfsCounter, 448 mSDsluCounter, 541 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 448 SdHoareTripleChecker+Valid, 1095 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:09,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [448 Valid, 1095 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-10-17 17:40:09,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5433 states. [2022-10-17 17:40:09,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5433 to 5426. [2022-10-17 17:40:09,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5426 states, 3639 states have (on average 1.3561417971970322) internal successors, (4935), 3743 states have internal predecessors, (4935), 1200 states have call successors, (1200), 587 states have call predecessors, (1200), 586 states have return successors, (1311), 1179 states have call predecessors, (1311), 1199 states have call successors, (1311) [2022-10-17 17:40:09,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5426 states to 5426 states and 7446 transitions. [2022-10-17 17:40:09,351 INFO L78 Accepts]: Start accepts. Automaton has 5426 states and 7446 transitions. Word has length 129 [2022-10-17 17:40:09,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:09,352 INFO L495 AbstractCegarLoop]: Abstraction has 5426 states and 7446 transitions. [2022-10-17 17:40:09,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2022-10-17 17:40:09,352 INFO L276 IsEmpty]: Start isEmpty. Operand 5426 states and 7446 transitions. [2022-10-17 17:40:09,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2022-10-17 17:40:09,365 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:09,366 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 3, 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] [2022-10-17 17:40:09,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-10-17 17:40:09,366 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:09,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:09,367 INFO L85 PathProgramCache]: Analyzing trace with hash 402002428, now seen corresponding path program 1 times [2022-10-17 17:40:09,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:09,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944308443] [2022-10-17 17:40:09,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:09,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:09,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:09,604 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-10-17 17:40:09,605 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:09,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944308443] [2022-10-17 17:40:09,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944308443] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:09,605 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:09,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:09,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703608738] [2022-10-17 17:40:09,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:09,609 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:09,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:09,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:09,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:09,610 INFO L87 Difference]: Start difference. First operand 5426 states and 7446 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2022-10-17 17:40:11,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:11,403 INFO L93 Difference]: Finished difference Result 8186 states and 11366 transitions. [2022-10-17 17:40:11,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:11,413 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) Word has length 133 [2022-10-17 17:40:11,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:11,455 INFO L225 Difference]: With dead ends: 8186 [2022-10-17 17:40:11,456 INFO L226 Difference]: Without dead ends: 5466 [2022-10-17 17:40:11,470 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 [2022-10-17 17:40:11,471 INFO L413 NwaCegarLoop]: 533 mSDtfsCounter, 4 mSDsluCounter, 609 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 1060 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:11,472 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 1060 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-10-17 17:40:11,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5466 states. [2022-10-17 17:40:11,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5466 to 5466. [2022-10-17 17:40:11,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5466 states, 3669 states have (on average 1.3532297628781684) internal successors, (4965), 3783 states have internal predecessors, (4965), 1200 states have call successors, (1200), 587 states have call predecessors, (1200), 596 states have return successors, (1321), 1179 states have call predecessors, (1321), 1199 states have call successors, (1321) [2022-10-17 17:40:11,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5466 states to 5466 states and 7486 transitions. [2022-10-17 17:40:11,854 INFO L78 Accepts]: Start accepts. Automaton has 5466 states and 7486 transitions. Word has length 133 [2022-10-17 17:40:11,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:11,855 INFO L495 AbstractCegarLoop]: Abstraction has 5466 states and 7486 transitions. [2022-10-17 17:40:11,856 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2022-10-17 17:40:11,856 INFO L276 IsEmpty]: Start isEmpty. Operand 5466 states and 7486 transitions. [2022-10-17 17:40:11,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-10-17 17:40:11,867 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:11,868 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 3, 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] [2022-10-17 17:40:11,868 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-10-17 17:40:11,868 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:11,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:11,869 INFO L85 PathProgramCache]: Analyzing trace with hash -851000526, now seen corresponding path program 1 times [2022-10-17 17:40:11,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:11,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138364713] [2022-10-17 17:40:11,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:11,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:11,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:12,539 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-10-17 17:40:12,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:12,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138364713] [2022-10-17 17:40:12,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138364713] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:12,540 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:12,540 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-10-17 17:40:12,541 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311661111] [2022-10-17 17:40:12,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:12,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:40:12,542 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:12,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:40:12,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-10-17 17:40:12,543 INFO L87 Difference]: Start difference. First operand 5466 states and 7486 transitions. Second operand has 8 states, 8 states have (on average 7.875) internal successors, (63), 7 states have internal predecessors, (63), 5 states have call successors, (19), 4 states have call predecessors, (19), 2 states have return successors, (18), 5 states have call predecessors, (18), 4 states have call successors, (18) [2022-10-17 17:40:17,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:17,641 INFO L93 Difference]: Finished difference Result 11807 states and 16265 transitions. [2022-10-17 17:40:17,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-10-17 17:40:17,643 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 7.875) internal successors, (63), 7 states have internal predecessors, (63), 5 states have call successors, (19), 4 states have call predecessors, (19), 2 states have return successors, (18), 5 states have call predecessors, (18), 4 states have call successors, (18) Word has length 134 [2022-10-17 17:40:17,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:17,693 INFO L225 Difference]: With dead ends: 11807 [2022-10-17 17:40:17,693 INFO L226 Difference]: Without dead ends: 6370 [2022-10-17 17:40:17,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2022-10-17 17:40:17,713 INFO L413 NwaCegarLoop]: 581 mSDtfsCounter, 1090 mSDsluCounter, 1543 mSDsCounter, 0 mSdLazyCounter, 1826 mSolverCounterSat, 517 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1213 SdHoareTripleChecker+Valid, 1906 SdHoareTripleChecker+Invalid, 2343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 517 IncrementalHoareTripleChecker+Valid, 1826 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:17,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1213 Valid, 1906 Invalid, 2343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [517 Valid, 1826 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-10-17 17:40:17,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6370 states. [2022-10-17 17:40:18,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6370 to 6058. [2022-10-17 17:40:18,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6058 states, 4011 states have (on average 1.3380703066566941) internal successors, (5367), 4153 states have internal predecessors, (5367), 1346 states have call successors, (1346), 665 states have call predecessors, (1346), 700 states have return successors, (1519), 1331 states have call predecessors, (1519), 1345 states have call successors, (1519) [2022-10-17 17:40:18,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6058 states to 6058 states and 8232 transitions. [2022-10-17 17:40:18,134 INFO L78 Accepts]: Start accepts. Automaton has 6058 states and 8232 transitions. Word has length 134 [2022-10-17 17:40:18,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:18,135 INFO L495 AbstractCegarLoop]: Abstraction has 6058 states and 8232 transitions. [2022-10-17 17:40:18,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 7.875) internal successors, (63), 7 states have internal predecessors, (63), 5 states have call successors, (19), 4 states have call predecessors, (19), 2 states have return successors, (18), 5 states have call predecessors, (18), 4 states have call successors, (18) [2022-10-17 17:40:18,136 INFO L276 IsEmpty]: Start isEmpty. Operand 6058 states and 8232 transitions. [2022-10-17 17:40:18,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2022-10-17 17:40:18,152 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:18,153 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 3, 3, 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] [2022-10-17 17:40:18,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-10-17 17:40:18,153 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:18,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:18,154 INFO L85 PathProgramCache]: Analyzing trace with hash 992567424, now seen corresponding path program 1 times [2022-10-17 17:40:18,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:18,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157444451] [2022-10-17 17:40:18,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:18,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:18,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:18,682 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2022-10-17 17:40:18,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:18,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157444451] [2022-10-17 17:40:18,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157444451] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:18,683 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:18,683 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 17:40:18,683 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430948107] [2022-10-17 17:40:18,683 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:18,684 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:40:18,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:18,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:40:18,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:40:18,685 INFO L87 Difference]: Start difference. First operand 6058 states and 8232 transitions. Second operand has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 3 states have call predecessors, (21), 2 states have call successors, (21) [2022-10-17 17:40:20,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:20,842 INFO L93 Difference]: Finished difference Result 12185 states and 16644 transitions. [2022-10-17 17:40:20,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:40:20,851 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 3 states have call predecessors, (21), 2 states have call successors, (21) Word has length 164 [2022-10-17 17:40:20,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:20,893 INFO L225 Difference]: With dead ends: 12185 [2022-10-17 17:40:20,894 INFO L226 Difference]: Without dead ends: 6156 [2022-10-17 17:40:20,916 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:40:20,917 INFO L413 NwaCegarLoop]: 532 mSDtfsCounter, 2 mSDsluCounter, 1827 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2110 SdHoareTripleChecker+Invalid, 357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:20,917 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 2110 Invalid, 357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-10-17 17:40:20,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6156 states. [2022-10-17 17:40:21,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6156 to 6122. [2022-10-17 17:40:21,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6122 states, 4059 states have (on average 1.3340724316334072) internal successors, (5415), 4201 states have internal predecessors, (5415), 1346 states have call successors, (1346), 665 states have call predecessors, (1346), 716 states have return successors, (1543), 1347 states have call predecessors, (1543), 1345 states have call successors, (1543) [2022-10-17 17:40:21,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6122 states to 6122 states and 8304 transitions. [2022-10-17 17:40:21,354 INFO L78 Accepts]: Start accepts. Automaton has 6122 states and 8304 transitions. Word has length 164 [2022-10-17 17:40:21,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:21,355 INFO L495 AbstractCegarLoop]: Abstraction has 6122 states and 8304 transitions. [2022-10-17 17:40:21,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 3 states have call predecessors, (21), 2 states have call successors, (21) [2022-10-17 17:40:21,355 INFO L276 IsEmpty]: Start isEmpty. Operand 6122 states and 8304 transitions. [2022-10-17 17:40:21,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2022-10-17 17:40:21,376 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:21,377 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:21,377 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-10-17 17:40:21,377 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:21,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:21,378 INFO L85 PathProgramCache]: Analyzing trace with hash 1336445128, now seen corresponding path program 1 times [2022-10-17 17:40:21,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:21,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325140140] [2022-10-17 17:40:21,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:21,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:21,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:21,988 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 374 trivial. 0 not checked. [2022-10-17 17:40:21,989 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:21,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325140140] [2022-10-17 17:40:21,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325140140] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:40:21,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41878501] [2022-10-17 17:40:21,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:21,990 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:21,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:40:21,993 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:40:21,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_71b87ec9-4bdf-4ef3-9742-83b89066dc7b/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:40:22,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:22,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 1417 conjuncts, 7 conjunts are in the unsatisfiable core [2022-10-17 17:40:22,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:40:22,663 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 153 proven. 0 refuted. 0 times theorem prover too weak. 243 trivial. 0 not checked. [2022-10-17 17:40:22,663 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:40:22,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41878501] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:22,663 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-10-17 17:40:22,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2022-10-17 17:40:22,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388742690] [2022-10-17 17:40:22,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:22,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-10-17 17:40:22,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:22,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-10-17 17:40:22,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-10-17 17:40:22,667 INFO L87 Difference]: Start difference. First operand 6122 states and 8304 transitions. Second operand has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21)