./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/ldv-linux-3.16-rc1/43_2a_consumption_linux-3.16-rc1.tar.xz-43_2a-sound--drivers--snd-aloop.ko-entry_point.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e19ca921 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/ldv-linux-3.16-rc1/43_2a_consumption_linux-3.16-rc1.tar.xz-43_2a-sound--drivers--snd-aloop.ko-entry_point.cil.out.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 Automizer --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 0b0b41862c2f2ed85815e97691c99c06d3eb1c9f09c717c7d2a79de23098870a --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 14:46:56,947 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 14:46:56,950 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 14:46:56,991 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 14:46:56,992 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 14:46:56,995 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 14:46:56,996 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 14:46:56,999 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 14:46:57,001 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 14:46:57,003 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 14:46:57,003 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 14:46:57,005 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 14:46:57,005 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 14:46:57,009 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 14:46:57,011 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 14:46:57,013 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 14:46:57,014 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 14:46:57,015 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 14:46:57,017 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 14:46:57,022 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 14:46:57,023 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 14:46:57,024 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 14:46:57,026 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 14:46:57,027 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 14:46:57,033 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 14:46:57,033 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 14:46:57,033 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 14:46:57,035 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 14:46:57,035 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 14:46:57,036 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 14:46:57,036 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 14:46:57,037 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 14:46:57,038 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 14:46:57,039 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 14:46:57,040 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 14:46:57,040 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 14:46:57,041 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 14:46:57,041 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 14:46:57,041 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 14:46:57,042 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 14:46:57,042 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 14:46:57,043 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-12-22 14:46:57,075 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 14:46:57,075 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 14:46:57,076 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 14:46:57,076 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 14:46:57,077 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 14:46:57,077 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 14:46:57,077 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 14:46:57,078 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 14:46:57,078 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 14:46:57,078 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 14:46:57,079 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 14:46:57,079 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 14:46:57,079 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-22 14:46:57,079 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 14:46:57,079 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-22 14:46:57,080 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-22 14:46:57,080 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 14:46:57,080 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-22 14:46:57,080 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 14:46:57,080 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 14:46:57,081 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 14:46:57,081 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 14:46:57,081 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 14:46:57,081 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 14:46:57,081 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-22 14:46:57,082 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 14:46:57,082 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 14:46:57,082 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-22 14:46:57,082 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-22 14:46:57,082 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-22 14:46:57,082 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 14:46:57,083 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:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b0b41862c2f2ed85815e97691c99c06d3eb1c9f09c717c7d2a79de23098870a [2021-12-22 14:46:57,301 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 14:46:57,322 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 14:46:57,325 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 14:46:57,326 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 14:46:57,326 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 14:46:57,328 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/ldv-linux-3.16-rc1/43_2a_consumption_linux-3.16-rc1.tar.xz-43_2a-sound--drivers--snd-aloop.ko-entry_point.cil.out.i [2021-12-22 14:46:57,389 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2988a8975/153a4592f90b4887a267632abbc44243/FLAG35a1d57e3 [2021-12-22 14:46:57,978 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 14:46:57,979 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/ldv-linux-3.16-rc1/43_2a_consumption_linux-3.16-rc1.tar.xz-43_2a-sound--drivers--snd-aloop.ko-entry_point.cil.out.i [2021-12-22 14:46:58,013 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2988a8975/153a4592f90b4887a267632abbc44243/FLAG35a1d57e3 [2021-12-22 14:46:58,167 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2988a8975/153a4592f90b4887a267632abbc44243 [2021-12-22 14:46:58,169 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 14:46:58,172 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 14:46:58,174 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 14:46:58,174 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 14:46:58,177 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 14:46:58,177 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 02:46:58" (1/1) ... [2021-12-22 14:46:58,178 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@795d68d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:58, skipping insertion in model container [2021-12-22 14:46:58,178 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 02:46:58" (1/1) ... [2021-12-22 14:46:58,184 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 14:46:58,276 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 14:46:58,605 WARN L1240 CHandler]: Detected problem Invalid redeclaration of the name show at C: (*show)(struct kobject___0 * , struct attribute___0 * , char * ) [3724] [2021-12-22 14:46:58,606 WARN L1240 CHandler]: Detected problem Invalid redeclaration of the name store at C: (*store)(struct kobject___0 * , struct attribute___0 * , char const * , size_t ) [3725-3726] [2021-12-22 14:46:58,800 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/ldv-linux-3.16-rc1/43_2a_consumption_linux-3.16-rc1.tar.xz-43_2a-sound--drivers--snd-aloop.ko-entry_point.cil.out.i[111472,111485] [2021-12-22 14:46:59,451 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 14:46:59,477 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 14:46:59,581 WARN L1240 CHandler]: Detected problem Invalid redeclaration of the name show at C: (*show)(struct kobject___0 * , struct attribute___0 * , char * ) [3724] [2021-12-22 14:46:59,582 WARN L1240 CHandler]: Detected problem Invalid redeclaration of the name store at C: (*store)(struct kobject___0 * , struct attribute___0 * , char const * , size_t ) [3725-3726] [2021-12-22 14:46:59,592 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/ldv-linux-3.16-rc1/43_2a_consumption_linux-3.16-rc1.tar.xz-43_2a-sound--drivers--snd-aloop.ko-entry_point.cil.out.i[111472,111485] [2021-12-22 14:46:59,763 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 14:46:59,863 INFO L208 MainTranslator]: Completed translation [2021-12-22 14:46:59,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59 WrapperNode [2021-12-22 14:46:59,864 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 14:46:59,865 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 14:46:59,865 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 14:46:59,865 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 14:46:59,871 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (1/1) ... [2021-12-22 14:46:59,949 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (1/1) ... [2021-12-22 14:47:00,109 INFO L137 Inliner]: procedures = 205, calls = 1641, calls flagged for inlining = 86, calls inlined = 81, statements flattened = 3565 [2021-12-22 14:47:00,110 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 14:47:00,111 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 14:47:00,111 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 14:47:00,111 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 14:47:00,118 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (1/1) ... [2021-12-22 14:47:00,119 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (1/1) ... [2021-12-22 14:47:00,150 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (1/1) ... [2021-12-22 14:47:00,150 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (1/1) ... [2021-12-22 14:47:00,247 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (1/1) ... [2021-12-22 14:47:00,269 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (1/1) ... [2021-12-22 14:47:00,293 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (1/1) ... [2021-12-22 14:47:00,364 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 14:47:00,365 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 14:47:00,365 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 14:47:00,365 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 14:47:00,366 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (1/1) ... [2021-12-22 14:47:00,380 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 14:47:00,390 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 14:47:00,405 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-22 14:47:00,431 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-22 14:47:00,460 INFO L130 BoogieDeclarations]: Found specification of procedure get_setup [2021-12-22 14:47:00,461 INFO L138 BoogieDeclarations]: Found implementation of procedure get_setup [2021-12-22 14:47:00,461 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_strcpy [2021-12-22 14:47:00,461 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_strcpy [2021-12-22 14:47:00,461 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2021-12-22 14:47:00,461 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2021-12-22 14:47:00,462 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2021-12-22 14:47:00,462 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2021-12-22 14:47:00,462 INFO L130 BoogieDeclarations]: Found specification of procedure snd_pcm_format_set_silence [2021-12-22 14:47:00,462 INFO L138 BoogieDeclarations]: Found implementation of procedure snd_pcm_format_set_silence [2021-12-22 14:47:00,462 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_spin_lock [2021-12-22 14:47:00,462 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_spin_lock [2021-12-22 14:47:00,462 INFO L130 BoogieDeclarations]: Found specification of procedure byte_pos [2021-12-22 14:47:00,463 INFO L138 BoogieDeclarations]: Found implementation of procedure byte_pos [2021-12-22 14:47:00,463 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-12-22 14:47:00,463 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-12-22 14:47:00,463 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_trigger [2021-12-22 14:47:00,463 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_trigger [2021-12-22 14:47:00,463 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_pcm_new [2021-12-22 14:47:00,464 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_pcm_new [2021-12-22 14:47:00,464 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_unlock [2021-12-22 14:47:00,464 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_unlock [2021-12-22 14:47:00,464 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-12-22 14:47:00,464 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-12-22 14:47:00,464 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_open [2021-12-22 14:47:00,465 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_open [2021-12-22 14:47:00,465 INFO L130 BoogieDeclarations]: Found specification of procedure params_change [2021-12-22 14:47:00,465 INFO L138 BoogieDeclarations]: Found implementation of procedure params_change [2021-12-22 14:47:00,465 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-12-22 14:47:00,465 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-12-22 14:47:00,466 INFO L130 BoogieDeclarations]: Found specification of procedure snd_pcm_set_ops [2021-12-22 14:47:00,466 INFO L138 BoogieDeclarations]: Found implementation of procedure snd_pcm_set_ops [2021-12-22 14:47:00,466 INFO L130 BoogieDeclarations]: Found specification of procedure div_u64 [2021-12-22 14:47:00,466 INFO L138 BoogieDeclarations]: Found implementation of procedure div_u64 [2021-12-22 14:47:00,467 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_timer_1 [2021-12-22 14:47:00,467 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_timer_1 [2021-12-22 14:47:00,467 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_timer_stop [2021-12-22 14:47:00,467 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_timer_stop [2021-12-22 14:47:00,467 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-22 14:47:00,467 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_hw_free [2021-12-22 14:47:00,467 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_hw_free [2021-12-22 14:47:00,468 INFO L130 BoogieDeclarations]: Found specification of procedure get_cable_index [2021-12-22 14:47:00,468 INFO L138 BoogieDeclarations]: Found implementation of procedure get_cable_index [2021-12-22 14:47:00,468 INFO L130 BoogieDeclarations]: Found specification of procedure snd_pcm_suspend_all [2021-12-22 14:47:00,468 INFO L138 BoogieDeclarations]: Found implementation of procedure snd_pcm_suspend_all [2021-12-22 14:47:00,468 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-22 14:47:00,469 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_spin_unlock [2021-12-22 14:47:00,469 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_spin_unlock [2021-12-22 14:47:00,469 INFO L130 BoogieDeclarations]: Found specification of procedure platform_device_unregister [2021-12-22 14:47:00,469 INFO L138 BoogieDeclarations]: Found implementation of procedure platform_device_unregister [2021-12-22 14:47:00,470 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock_irqrestore [2021-12-22 14:47:00,470 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock_irqrestore [2021-12-22 14:47:00,471 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-22 14:47:00,471 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-22 14:47:00,472 INFO L130 BoogieDeclarations]: Found specification of procedure snd_pcm_lib_get_vmalloc_page [2021-12-22 14:47:00,472 INFO L138 BoogieDeclarations]: Found implementation of procedure snd_pcm_lib_get_vmalloc_page [2021-12-22 14:47:00,473 INFO L130 BoogieDeclarations]: Found specification of procedure kzalloc [2021-12-22 14:47:00,473 INFO L138 BoogieDeclarations]: Found implementation of procedure kzalloc [2021-12-22 14:47:00,473 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_close [2021-12-22 14:47:00,473 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_close [2021-12-22 14:47:00,473 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock_nested [2021-12-22 14:47:00,473 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock_nested [2021-12-22 14:47:00,474 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock [2021-12-22 14:47:00,474 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock [2021-12-22 14:47:00,474 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_active_notify [2021-12-22 14:47:00,474 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_active_notify [2021-12-22 14:47:00,474 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~int [2021-12-22 14:47:00,474 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_zalloc [2021-12-22 14:47:00,475 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_zalloc [2021-12-22 14:47:00,475 INFO L130 BoogieDeclarations]: Found specification of procedure dev_get_drvdata [2021-12-22 14:47:00,475 INFO L138 BoogieDeclarations]: Found implementation of procedure dev_get_drvdata [2021-12-22 14:47:00,475 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_pointer [2021-12-22 14:47:00,476 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_pointer [2021-12-22 14:47:00,476 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-12-22 14:47:00,476 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_hw_params [2021-12-22 14:47:00,476 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_hw_params [2021-12-22 14:47:00,476 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-22 14:47:00,477 INFO L130 BoogieDeclarations]: Found specification of procedure bytepos_finish [2021-12-22 14:47:00,477 INFO L138 BoogieDeclarations]: Found implementation of procedure bytepos_finish [2021-12-22 14:47:00,477 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_timer_start [2021-12-22 14:47:00,477 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_timer_start [2021-12-22 14:47:00,477 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_prepare [2021-12-22 14:47:00,477 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_prepare [2021-12-22 14:47:00,477 INFO L130 BoogieDeclarations]: Found specification of procedure activate_suitable_timer_1 [2021-12-22 14:47:00,478 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_suitable_timer_1 [2021-12-22 14:47:00,478 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_proc_new [2021-12-22 14:47:00,478 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_proc_new [2021-12-22 14:47:00,479 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2021-12-22 14:47:00,479 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2021-12-22 14:47:00,479 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-22 14:47:00,479 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 14:47:00,480 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 14:47:00,480 INFO L130 BoogieDeclarations]: Found specification of procedure bytepos_delta [2021-12-22 14:47:00,480 INFO L138 BoogieDeclarations]: Found implementation of procedure bytepos_delta [2021-12-22 14:47:00,480 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_suspend [2021-12-22 14:47:00,481 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_suspend [2021-12-22 14:47:00,481 INFO L130 BoogieDeclarations]: Found specification of procedure frames_to_bytes [2021-12-22 14:47:00,481 INFO L138 BoogieDeclarations]: Found implementation of procedure frames_to_bytes [2021-12-22 14:47:00,482 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-22 14:47:00,482 INFO L130 BoogieDeclarations]: Found specification of procedure snd_ctl_notify [2021-12-22 14:47:00,482 INFO L138 BoogieDeclarations]: Found implementation of procedure snd_ctl_notify [2021-12-22 14:47:00,482 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_resume [2021-12-22 14:47:00,482 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_resume [2021-12-22 14:47:00,483 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_pos_update [2021-12-22 14:47:00,483 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_pos_update [2021-12-22 14:47:00,483 INFO L130 BoogieDeclarations]: Found specification of procedure snd_pcm_lib_ioctl [2021-12-22 14:47:00,483 INFO L138 BoogieDeclarations]: Found implementation of procedure snd_pcm_lib_ioctl [2021-12-22 14:47:00,483 INFO L130 BoogieDeclarations]: Found specification of procedure snd_power_change_state [2021-12-22 14:47:00,484 INFO L138 BoogieDeclarations]: Found implementation of procedure snd_power_change_state [2021-12-22 14:47:00,484 INFO L130 BoogieDeclarations]: Found specification of procedure snd_card_free [2021-12-22 14:47:00,484 INFO L138 BoogieDeclarations]: Found implementation of procedure snd_card_free [2021-12-22 14:47:00,484 INFO L130 BoogieDeclarations]: Found specification of procedure platform_get_drvdata [2021-12-22 14:47:00,484 INFO L138 BoogieDeclarations]: Found implementation of procedure platform_get_drvdata [2021-12-22 14:47:00,485 INFO L130 BoogieDeclarations]: Found specification of procedure bytes_to_frames [2021-12-22 14:47:00,486 INFO L138 BoogieDeclarations]: Found implementation of procedure bytes_to_frames [2021-12-22 14:47:00,488 INFO L130 BoogieDeclarations]: Found specification of procedure loopback_unregister_all [2021-12-22 14:47:00,488 INFO L138 BoogieDeclarations]: Found implementation of procedure loopback_unregister_all [2021-12-22 14:47:00,488 INFO L130 BoogieDeclarations]: Found specification of procedure spin_lock [2021-12-22 14:47:00,488 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_lock [2021-12-22 14:47:00,489 INFO L130 BoogieDeclarations]: Found specification of procedure clear_capture_buf [2021-12-22 14:47:00,490 INFO L138 BoogieDeclarations]: Found implementation of procedure clear_capture_buf [2021-12-22 14:47:00,490 INFO L130 BoogieDeclarations]: Found specification of procedure params_change_substream [2021-12-22 14:47:00,490 INFO L138 BoogieDeclarations]: Found implementation of procedure params_change_substream [2021-12-22 14:47:00,491 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-22 14:47:00,495 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 14:47:00,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 14:47:00,495 INFO L130 BoogieDeclarations]: Found specification of procedure IS_ERR [2021-12-22 14:47:00,496 INFO L138 BoogieDeclarations]: Found implementation of procedure IS_ERR [2021-12-22 14:47:00,951 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 14:47:00,953 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 14:47:01,197 INFO L766 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2021-12-22 14:47:20,040 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 14:47:20,060 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 14:47:20,061 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-22 14:47:20,064 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 02:47:20 BoogieIcfgContainer [2021-12-22 14:47:20,064 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 14:47:20,066 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 14:47:20,066 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 14:47:20,069 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 14:47:20,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 02:46:58" (1/3) ... [2021-12-22 14:47:20,069 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16673ccc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 02:47:20, skipping insertion in model container [2021-12-22 14:47:20,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 02:46:59" (2/3) ... [2021-12-22 14:47:20,070 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16673ccc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 02:47:20, skipping insertion in model container [2021-12-22 14:47:20,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 02:47:20" (3/3) ... [2021-12-22 14:47:20,073 INFO L111 eAbstractionObserver]: Analyzing ICFG 43_2a_consumption_linux-3.16-rc1.tar.xz-43_2a-sound--drivers--snd-aloop.ko-entry_point.cil.out.i [2021-12-22 14:47:20,077 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 14:47:20,078 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-22 14:47:20,134 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 14:47:20,141 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-22 14:47:20,142 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-22 14:47:20,184 INFO L276 IsEmpty]: Start isEmpty. Operand has 860 states, 636 states have (on average 1.4119496855345912) internal successors, (898), 659 states have internal predecessors, (898), 167 states have call successors, (167), 56 states have call predecessors, (167), 55 states have return successors, (160), 153 states have call predecessors, (160), 160 states have call successors, (160) [2021-12-22 14:47:20,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-12-22 14:47:20,204 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 14:47:20,204 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 14:47:20,205 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 14:47:20,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 14:47:20,209 INFO L85 PathProgramCache]: Analyzing trace with hash -1959108130, now seen corresponding path program 1 times [2021-12-22 14:47:20,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 14:47:20,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587419272] [2021-12-22 14:47:20,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 14:47:20,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 14:47:20,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:20,724 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 14:47:20,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:20,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-22 14:47:20,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:20,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-12-22 14:47:20,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:20,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-22 14:47:20,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:20,767 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-12-22 14:47:20,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:20,776 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-12-22 14:47:20,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:20,789 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-22 14:47:20,790 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 14:47:20,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587419272] [2021-12-22 14:47:20,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587419272] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 14:47:20,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 14:47:20,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 14:47:20,793 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543358386] [2021-12-22 14:47:20,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 14:47:20,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 14:47:20,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 14:47:20,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 14:47:20,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 14:47:20,825 INFO L87 Difference]: Start difference. First operand has 860 states, 636 states have (on average 1.4119496855345912) internal successors, (898), 659 states have internal predecessors, (898), 167 states have call successors, (167), 56 states have call predecessors, (167), 55 states have return successors, (160), 153 states have call predecessors, (160), 160 states have call successors, (160) Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 3 states have internal predecessors, (39), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-22 14:47:23,592 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.45s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:28,055 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:30,092 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:32,141 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:34,187 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:35,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 14:47:35,327 INFO L93 Difference]: Finished difference Result 2630 states and 3810 transitions. [2021-12-22 14:47:35,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 14:47:35,329 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 3 states have internal predecessors, (39), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 63 [2021-12-22 14:47:35,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 14:47:35,359 INFO L225 Difference]: With dead ends: 2630 [2021-12-22 14:47:35,364 INFO L226 Difference]: Without dead ends: 1744 [2021-12-22 14:47:35,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-22 14:47:35,375 INFO L933 BasicCegarLoop]: 1293 mSDtfsCounter, 1454 mSDsluCounter, 1629 mSDsCounter, 0 mSdLazyCounter, 761 mSolverCounterSat, 440 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1550 SdHoareTripleChecker+Valid, 2922 SdHoareTripleChecker+Invalid, 1205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 440 IncrementalHoareTripleChecker+Valid, 761 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.2s IncrementalHoareTripleChecker+Time [2021-12-22 14:47:35,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1550 Valid, 2922 Invalid, 1205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [440 Valid, 761 Invalid, 4 Unknown, 0 Unchecked, 14.2s Time] [2021-12-22 14:47:35,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1744 states. [2021-12-22 14:47:35,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1744 to 1601. [2021-12-22 14:47:35,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1601 states, 1198 states have (on average 1.3939899833055092) internal successors, (1670), 1226 states have internal predecessors, (1670), 294 states have call successors, (294), 109 states have call predecessors, (294), 108 states have return successors, (293), 279 states have call predecessors, (293), 293 states have call successors, (293) [2021-12-22 14:47:35,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1601 states to 1601 states and 2257 transitions. [2021-12-22 14:47:35,567 INFO L78 Accepts]: Start accepts. Automaton has 1601 states and 2257 transitions. Word has length 63 [2021-12-22 14:47:35,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 14:47:35,569 INFO L470 AbstractCegarLoop]: Abstraction has 1601 states and 2257 transitions. [2021-12-22 14:47:35,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 3 states have internal predecessors, (39), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-22 14:47:35,569 INFO L276 IsEmpty]: Start isEmpty. Operand 1601 states and 2257 transitions. [2021-12-22 14:47:35,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-12-22 14:47:35,578 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 14:47:35,578 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 14:47:35,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-22 14:47:35,581 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 14:47:35,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 14:47:35,582 INFO L85 PathProgramCache]: Analyzing trace with hash 1653997606, now seen corresponding path program 1 times [2021-12-22 14:47:35,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 14:47:35,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463812916] [2021-12-22 14:47:35,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 14:47:35,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 14:47:35,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:35,721 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 14:47:35,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:35,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-22 14:47:35,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:35,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-12-22 14:47:35,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:35,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-22 14:47:35,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:35,752 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-12-22 14:47:35,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:35,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-12-22 14:47:35,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:35,765 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-22 14:47:35,765 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 14:47:35,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463812916] [2021-12-22 14:47:35,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [463812916] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 14:47:35,766 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 14:47:35,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 14:47:35,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058083537] [2021-12-22 14:47:35,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 14:47:35,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 14:47:35,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 14:47:35,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 14:47:35,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 14:47:35,769 INFO L87 Difference]: Start difference. First operand 1601 states and 2257 transitions. Second operand has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-22 14:47:39,926 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:43,580 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:45,600 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:47,650 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:49,675 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:52,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 14:47:52,404 INFO L93 Difference]: Finished difference Result 4665 states and 6606 transitions. [2021-12-22 14:47:52,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 14:47:52,405 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 58 [2021-12-22 14:47:52,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 14:47:52,426 INFO L225 Difference]: With dead ends: 4665 [2021-12-22 14:47:52,426 INFO L226 Difference]: Without dead ends: 3076 [2021-12-22 14:47:52,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-22 14:47:52,437 INFO L933 BasicCegarLoop]: 1575 mSDtfsCounter, 1320 mSDsluCounter, 1682 mSDsCounter, 0 mSdLazyCounter, 862 mSolverCounterSat, 357 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1419 SdHoareTripleChecker+Valid, 3257 SdHoareTripleChecker+Invalid, 1223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 357 IncrementalHoareTripleChecker+Valid, 862 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.4s IncrementalHoareTripleChecker+Time [2021-12-22 14:47:52,438 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1419 Valid, 3257 Invalid, 1223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [357 Valid, 862 Invalid, 4 Unknown, 0 Unchecked, 16.4s Time] [2021-12-22 14:47:52,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3076 states. [2021-12-22 14:47:52,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3076 to 2821. [2021-12-22 14:47:52,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2821 states, 2129 states have (on average 1.3954908407703146) internal successors, (2971), 2178 states have internal predecessors, (2971), 498 states have call successors, (498), 194 states have call predecessors, (498), 193 states have return successors, (497), 472 states have call predecessors, (497), 497 states have call successors, (497) [2021-12-22 14:47:52,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2821 states to 2821 states and 3966 transitions. [2021-12-22 14:47:52,550 INFO L78 Accepts]: Start accepts. Automaton has 2821 states and 3966 transitions. Word has length 58 [2021-12-22 14:47:52,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 14:47:52,550 INFO L470 AbstractCegarLoop]: Abstraction has 2821 states and 3966 transitions. [2021-12-22 14:47:52,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-22 14:47:52,550 INFO L276 IsEmpty]: Start isEmpty. Operand 2821 states and 3966 transitions. [2021-12-22 14:47:52,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-12-22 14:47:52,558 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 14:47:52,559 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 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] [2021-12-22 14:47:52,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-22 14:47:52,559 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 14:47:52,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 14:47:52,560 INFO L85 PathProgramCache]: Analyzing trace with hash 1343217034, now seen corresponding path program 1 times [2021-12-22 14:47:52,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 14:47:52,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204548261] [2021-12-22 14:47:52,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 14:47:52,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 14:47:52,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,807 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 14:47:52,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-22 14:47:52,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,831 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-12-22 14:47:52,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-22 14:47:52,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,854 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-12-22 14:47:52,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,863 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-12-22 14:47:52,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-12-22 14:47:52,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,887 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-12-22 14:47:52,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-12-22 14:47:52,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,916 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 96 [2021-12-22 14:47:52,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 14:47:52,925 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2021-12-22 14:47:52,925 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 14:47:52,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204548261] [2021-12-22 14:47:52,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204548261] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 14:47:52,926 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 14:47:52,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 14:47:52,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600947495] [2021-12-22 14:47:52,926 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 14:47:52,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 14:47:52,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 14:47:52,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 14:47:52,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 14:47:52,928 INFO L87 Difference]: Start difference. First operand 2821 states and 3966 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 3 states have internal predecessors, (58), 2 states have call successors, (13), 4 states have call predecessors, (13), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2021-12-22 14:47:56,839 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:47:58,878 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-22 14:48:00,908 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers []