./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--md--dm-raid.ko-entry_point.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--md--dm-raid.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V --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 62515c851d4d8c80398352da8857a26e67ae776a292d33d62b0afdc92addb3ad --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:35:48,020 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:35:48,022 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:35:48,071 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:35:48,071 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:35:48,076 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:35:48,079 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:35:48,084 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:35:48,087 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:35:48,093 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:35:48,094 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:35:48,096 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:35:48,096 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:35:48,099 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:35:48,102 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:35:48,107 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:35:48,110 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:35:48,111 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:35:48,116 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:35:48,124 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:35:48,126 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:35:48,128 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:35:48,132 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:35:48,133 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:35:48,143 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:35:48,143 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:35:48,144 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:35:48,146 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:35:48,147 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:35:48,149 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:35:48,149 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:35:48,150 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:35:48,152 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:35:48,154 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:35:48,156 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:35:48,156 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:35:48,157 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:35:48,157 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:35:48,158 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:35:48,159 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:35:48,160 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:35:48,161 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-23 02:35:48,211 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:35:48,211 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:35:48,212 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:35:48,212 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:35:48,220 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:35:48,221 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:35:48,221 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:35:48,221 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:35:48,222 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:35:48,222 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:35:48,223 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:35:48,223 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:35:48,223 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:35:48,224 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:35:48,224 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:35:48,224 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:35:48,224 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:35:48,225 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:35:48,226 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:35:48,226 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:35:48,227 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:35:48,227 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:35:48,227 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:35:48,227 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:35:48,227 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:35:48,228 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:35:48,229 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:35:48,230 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:35:48,230 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:35:48,230 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:35:48,230 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:35:48,231 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:35:48,231 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:35:48,231 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:35:48,231 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:35:48,232 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:35:48,232 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:35:48,232 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:35:48,232 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 62515c851d4d8c80398352da8857a26e67ae776a292d33d62b0afdc92addb3ad [2021-11-23 02:35:48,538 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:35:48,577 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:35:48,580 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:35:48,581 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:35:48,582 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:35:48,584 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--md--dm-raid.ko-entry_point.cil.out.i [2021-11-23 02:35:48,682 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/data/0061d70dd/bf4c9f19eb924ff5b9d2f0811b5efecb/FLAG08f17f490 [2021-11-23 02:35:49,746 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:35:49,747 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--md--dm-raid.ko-entry_point.cil.out.i [2021-11-23 02:35:49,801 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/data/0061d70dd/bf4c9f19eb924ff5b9d2f0811b5efecb/FLAG08f17f490 [2021-11-23 02:35:49,819 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/data/0061d70dd/bf4c9f19eb924ff5b9d2f0811b5efecb [2021-11-23 02:35:49,822 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:35:49,823 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:35:49,824 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:35:49,825 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:35:49,832 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:35:49,834 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:35:49" (1/1) ... [2021-11-23 02:35:49,836 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34adb7f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:49, skipping insertion in model container [2021-11-23 02:35:49,836 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:35:49" (1/1) ... [2021-11-23 02:35:49,844 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:35:49,998 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:35:52,277 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_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--md--dm-raid.ko-entry_point.cil.out.i[217361,217374] [2021-11-23 02:35:52,510 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:35:52,544 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:35:52,981 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_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--md--dm-raid.ko-entry_point.cil.out.i[217361,217374] [2021-11-23 02:35:52,997 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:35:53,129 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:35:53,130 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53 WrapperNode [2021-11-23 02:35:53,130 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:35:53,131 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:35:53,131 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:35:53,131 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:35:53,139 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (1/1) ... [2021-11-23 02:35:53,257 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (1/1) ... [2021-11-23 02:35:53,441 INFO L137 Inliner]: procedures = 221, calls = 1591, calls flagged for inlining = 84, calls inlined = 76, statements flattened = 4430 [2021-11-23 02:35:53,442 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:35:53,443 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:35:53,443 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:35:53,443 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:35:53,453 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (1/1) ... [2021-11-23 02:35:53,453 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (1/1) ... [2021-11-23 02:35:53,521 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (1/1) ... [2021-11-23 02:35:53,522 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (1/1) ... [2021-11-23 02:35:53,631 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (1/1) ... [2021-11-23 02:35:53,654 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (1/1) ... [2021-11-23 02:35:53,671 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (1/1) ... [2021-11-23 02:35:53,698 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:35:53,699 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:35:53,700 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:35:53,700 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:35:53,701 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (1/1) ... [2021-11-23 02:35:53,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:35:53,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:53,806 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:35:53,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:35:53,873 INFO L130 BoogieDeclarations]: Found specification of procedure dm_table_get_mode [2021-11-23 02:35:53,874 INFO L138 BoogieDeclarations]: Found implementation of procedure dm_table_get_mode [2021-11-23 02:35:53,874 INFO L130 BoogieDeclarations]: Found specification of procedure bdev_get_queue [2021-11-23 02:35:53,874 INFO L138 BoogieDeclarations]: Found implementation of procedure bdev_get_queue [2021-11-23 02:35:53,874 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2021-11-23 02:35:53,874 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2021-11-23 02:35:53,875 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-11-23 02:35:53,875 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-11-23 02:35:53,875 INFO L130 BoogieDeclarations]: Found specification of procedure lowmem_page_address [2021-11-23 02:35:53,875 INFO L138 BoogieDeclarations]: Found implementation of procedure lowmem_page_address [2021-11-23 02:35:53,875 INFO L130 BoogieDeclarations]: Found specification of procedure raid10_md_layout_to_format [2021-11-23 02:35:53,876 INFO L138 BoogieDeclarations]: Found implementation of procedure raid10_md_layout_to_format [2021-11-23 02:35:53,876 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-23 02:35:53,876 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-23 02:35:53,876 INFO L130 BoogieDeclarations]: Found specification of procedure raid_io_hints [2021-11-23 02:35:53,876 INFO L138 BoogieDeclarations]: Found implementation of procedure raid_io_hints [2021-11-23 02:35:53,877 INFO L130 BoogieDeclarations]: Found specification of procedure raid_message [2021-11-23 02:35:53,877 INFO L138 BoogieDeclarations]: Found implementation of procedure raid_message [2021-11-23 02:35:53,877 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-11-23 02:35:53,877 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-11-23 02:35:53,877 INFO L130 BoogieDeclarations]: Found specification of procedure clear_bit [2021-11-23 02:35:53,878 INFO L138 BoogieDeclarations]: Found implementation of procedure clear_bit [2021-11-23 02:35:53,878 INFO L130 BoogieDeclarations]: Found specification of procedure raid10_md_layout_to_copies [2021-11-23 02:35:53,878 INFO L138 BoogieDeclarations]: Found implementation of procedure raid10_md_layout_to_copies [2021-11-23 02:35:53,878 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2021-11-23 02:35:53,878 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2021-11-23 02:35:53,879 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 02:35:53,879 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 02:35:53,879 INFO L130 BoogieDeclarations]: Found specification of procedure context_free [2021-11-23 02:35:53,879 INFO L138 BoogieDeclarations]: Found implementation of procedure context_free [2021-11-23 02:35:53,879 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock [2021-11-23 02:35:53,880 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock [2021-11-23 02:35:53,880 INFO L130 BoogieDeclarations]: Found specification of procedure ERR_PTR [2021-11-23 02:35:53,880 INFO L138 BoogieDeclarations]: Found implementation of procedure ERR_PTR [2021-11-23 02:35:53,881 INFO L130 BoogieDeclarations]: Found specification of procedure super_validate [2021-11-23 02:35:53,881 INFO L138 BoogieDeclarations]: Found implementation of procedure super_validate [2021-11-23 02:35:53,881 INFO L130 BoogieDeclarations]: Found specification of procedure do_table_event [2021-11-23 02:35:53,882 INFO L138 BoogieDeclarations]: Found implementation of procedure do_table_event [2021-11-23 02:35:53,882 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 02:35:53,882 INFO L130 BoogieDeclarations]: Found specification of procedure INIT_LIST_HEAD [2021-11-23 02:35:53,882 INFO L138 BoogieDeclarations]: Found implementation of procedure INIT_LIST_HEAD [2021-11-23 02:35:53,882 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 02:35:53,883 INFO L130 BoogieDeclarations]: Found specification of procedure sync_page_io [2021-11-23 02:35:53,883 INFO L138 BoogieDeclarations]: Found implementation of procedure sync_page_io [2021-11-23 02:35:53,883 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_is_err [2021-11-23 02:35:53,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_is_err [2021-11-23 02:35:53,884 INFO L130 BoogieDeclarations]: Found specification of procedure to_sector [2021-11-23 02:35:53,884 INFO L138 BoogieDeclarations]: Found implementation of procedure to_sector [2021-11-23 02:35:53,885 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 02:35:53,886 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-23 02:35:53,886 INFO L130 BoogieDeclarations]: Found specification of procedure raid_iterate_devices [2021-11-23 02:35:53,887 INFO L138 BoogieDeclarations]: Found implementation of procedure raid_iterate_devices [2021-11-23 02:35:53,887 INFO L130 BoogieDeclarations]: Found specification of procedure dm_put_device [2021-11-23 02:35:53,888 INFO L138 BoogieDeclarations]: Found implementation of procedure dm_put_device [2021-11-23 02:35:53,888 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_reconfig_mutex_of_mddev [2021-11-23 02:35:53,888 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_reconfig_mutex_of_mddev [2021-11-23 02:35:53,889 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:35:53,889 INFO L130 BoogieDeclarations]: Found specification of procedure mddev_suspend [2021-11-23 02:35:53,889 INFO L138 BoogieDeclarations]: Found implementation of procedure mddev_suspend [2021-11-23 02:35:53,890 INFO L130 BoogieDeclarations]: Found specification of procedure constant_test_bit [2021-11-23 02:35:53,890 INFO L138 BoogieDeclarations]: Found implementation of procedure constant_test_bit [2021-11-23 02:35:53,890 INFO L130 BoogieDeclarations]: Found specification of procedure super_sync [2021-11-23 02:35:53,891 INFO L138 BoogieDeclarations]: Found implementation of procedure super_sync [2021-11-23 02:35:53,891 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:35:53,891 INFO L130 BoogieDeclarations]: Found specification of procedure is_power_of_2 [2021-11-23 02:35:53,891 INFO L138 BoogieDeclarations]: Found implementation of procedure is_power_of_2 [2021-11-23 02:35:53,891 INFO L130 BoogieDeclarations]: Found specification of procedure md_wakeup_thread [2021-11-23 02:35:53,892 INFO L138 BoogieDeclarations]: Found implementation of procedure md_wakeup_thread [2021-11-23 02:35:53,892 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_init_zalloc [2021-11-23 02:35:53,892 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_init_zalloc [2021-11-23 02:35:53,893 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:35:53,894 INFO L130 BoogieDeclarations]: Found specification of procedure raid_merge [2021-11-23 02:35:53,894 INFO L138 BoogieDeclarations]: Found implementation of procedure raid_merge [2021-11-23 02:35:53,894 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_memset [2021-11-23 02:35:53,894 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_memset [2021-11-23 02:35:53,894 INFO L130 BoogieDeclarations]: Found specification of procedure raid_map [2021-11-23 02:35:53,895 INFO L138 BoogieDeclarations]: Found implementation of procedure raid_map [2021-11-23 02:35:53,895 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:35:53,895 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 02:35:53,895 INFO L130 BoogieDeclarations]: Found specification of procedure strcasecmp [2021-11-23 02:35:53,895 INFO L138 BoogieDeclarations]: Found implementation of procedure strcasecmp [2021-11-23 02:35:53,896 INFO L130 BoogieDeclarations]: Found specification of procedure md_stop [2021-11-23 02:35:53,897 INFO L138 BoogieDeclarations]: Found implementation of procedure md_stop [2021-11-23 02:35:53,897 INFO L130 BoogieDeclarations]: Found specification of procedure raid_status [2021-11-23 02:35:53,897 INFO L138 BoogieDeclarations]: Found implementation of procedure raid_status [2021-11-23 02:35:53,898 INFO L130 BoogieDeclarations]: Found specification of procedure kstrtoul [2021-11-23 02:35:53,898 INFO L138 BoogieDeclarations]: Found implementation of procedure kstrtoul [2021-11-23 02:35:53,899 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~X~$Pointer$~TO~int [2021-11-23 02:35:53,899 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~X~$Pointer$~TO~int [2021-11-23 02:35:53,899 INFO L130 BoogieDeclarations]: Found specification of procedure set_bit [2021-11-23 02:35:53,899 INFO L138 BoogieDeclarations]: Found implementation of procedure set_bit [2021-11-23 02:35:53,900 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:35:53,901 INFO L130 BoogieDeclarations]: Found specification of procedure raid_dtr [2021-11-23 02:35:53,901 INFO L138 BoogieDeclarations]: Found implementation of procedure raid_dtr [2021-11-23 02:35:53,901 INFO L130 BoogieDeclarations]: Found specification of procedure dm_get_device [2021-11-23 02:35:53,902 INFO L138 BoogieDeclarations]: Found implementation of procedure dm_get_device [2021-11-23 02:35:53,902 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:35:53,902 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:35:53,902 INFO L130 BoogieDeclarations]: Found specification of procedure IS_ERR [2021-11-23 02:35:53,902 INFO L138 BoogieDeclarations]: Found implementation of procedure IS_ERR [2021-11-23 02:35:54,719 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:35:54,722 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:35:55,184 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2021-11-23 02:35:59,330 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:36:00,356 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:36:00,357 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 02:36:00,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:36:00 BoogieIcfgContainer [2021-11-23 02:36:00,366 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:36:00,368 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:36:00,368 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:36:00,373 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:36:00,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:35:49" (1/3) ... [2021-11-23 02:36:00,378 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@622ad10d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:36:00, skipping insertion in model container [2021-11-23 02:36:00,378 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:35:53" (2/3) ... [2021-11-23 02:36:00,379 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@622ad10d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:36:00, skipping insertion in model container [2021-11-23 02:36:00,380 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:36:00" (3/3) ... [2021-11-23 02:36:00,382 INFO L111 eAbstractionObserver]: Analyzing ICFG linux-4.2-rc1.tar.xz-32_7a-drivers--md--dm-raid.ko-entry_point.cil.out.i [2021-11-23 02:36:00,389 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:36:00,389 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:36:00,467 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:36:00,476 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=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, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:36:00,483 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:36:00,540 INFO L276 IsEmpty]: Start isEmpty. Operand has 874 states, 613 states have (on average 1.468189233278956) internal successors, (900), 634 states have internal predecessors, (900), 216 states have call successors, (216), 44 states have call predecessors, (216), 43 states have return successors, (212), 208 states have call predecessors, (212), 212 states have call successors, (212) [2021-11-23 02:36:00,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-23 02:36:00,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:00,565 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:00,568 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:00,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:00,579 INFO L85 PathProgramCache]: Analyzing trace with hash -861204368, now seen corresponding path program 1 times [2021-11-23 02:36:00,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:00,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371186874] [2021-11-23 02:36:00,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:00,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:01,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:01,519 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2021-11-23 02:36:01,520 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:01,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371186874] [2021-11-23 02:36:01,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371186874] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:01,522 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:01,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:36:01,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485482007] [2021-11-23 02:36:01,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:01,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:36:01,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:01,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:36:01,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:36:01,619 INFO L87 Difference]: Start difference. First operand has 874 states, 613 states have (on average 1.468189233278956) internal successors, (900), 634 states have internal predecessors, (900), 216 states have call successors, (216), 44 states have call predecessors, (216), 43 states have return successors, (212), 208 states have call predecessors, (212), 212 states have call successors, (212) Second operand has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 1 states have call predecessors, (18), 1 states have call successors, (18) [2021-11-23 02:36:03,678 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 [] [2021-11-23 02:36:05,235 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:07,714 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:08,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:08,490 INFO L93 Difference]: Finished difference Result 2528 states and 3855 transitions. [2021-11-23 02:36:08,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:36:08,493 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 1 states have call predecessors, (18), 1 states have call successors, (18) Word has length 170 [2021-11-23 02:36:08,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:08,533 INFO L225 Difference]: With dead ends: 2528 [2021-11-23 02:36:08,534 INFO L226 Difference]: Without dead ends: 1675 [2021-11-23 02:36:08,544 INFO L932 BasicCegarLoop]: 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 [2021-11-23 02:36:08,548 INFO L933 BasicCegarLoop]: 1378 mSDtfsCounter, 1237 mSDsluCounter, 1311 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1237 SdHoareTripleChecker+Valid, 2560 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:08,549 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1237 Valid, 2560 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 272 Invalid, 1 Unknown, 0 Unchecked, 6.6s Time] [2021-11-23 02:36:08,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1675 states. [2021-11-23 02:36:08,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1675 to 1672. [2021-11-23 02:36:08,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1672 states, 1190 states have (on average 1.464705882352941) internal successors, (1743), 1216 states have internal predecessors, (1743), 400 states have call successors, (400), 82 states have call predecessors, (400), 81 states have return successors, (395), 387 states have call predecessors, (395), 395 states have call successors, (395) [2021-11-23 02:36:08,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1672 states to 1672 states and 2538 transitions. [2021-11-23 02:36:08,855 INFO L78 Accepts]: Start accepts. Automaton has 1672 states and 2538 transitions. Word has length 170 [2021-11-23 02:36:08,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:08,860 INFO L470 AbstractCegarLoop]: Abstraction has 1672 states and 2538 transitions. [2021-11-23 02:36:08,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 1 states have call predecessors, (18), 1 states have call successors, (18) [2021-11-23 02:36:08,863 INFO L276 IsEmpty]: Start isEmpty. Operand 1672 states and 2538 transitions. [2021-11-23 02:36:08,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-23 02:36:08,879 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:08,879 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:08,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:36:08,885 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:08,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:08,896 INFO L85 PathProgramCache]: Analyzing trace with hash 4786961, now seen corresponding path program 1 times [2021-11-23 02:36:08,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:08,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091186975] [2021-11-23 02:36:08,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:08,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:09,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:09,308 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2021-11-23 02:36:09,308 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:09,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091186975] [2021-11-23 02:36:09,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091186975] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:09,311 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:09,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:36:09,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220656478] [2021-11-23 02:36:09,312 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:09,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:36:09,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:09,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:36:09,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:36:09,318 INFO L87 Difference]: Start difference. First operand 1672 states and 2538 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 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) [2021-11-23 02:36:11,351 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 [] [2021-11-23 02:36:12,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:12,844 INFO L93 Difference]: Finished difference Result 1674 states and 2539 transitions. [2021-11-23 02:36:12,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:36:12,845 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 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 173 [2021-11-23 02:36:12,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:12,864 INFO L225 Difference]: With dead ends: 1674 [2021-11-23 02:36:12,865 INFO L226 Difference]: Without dead ends: 1671 [2021-11-23 02:36:12,866 INFO L932 BasicCegarLoop]: 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 [2021-11-23 02:36:12,868 INFO L933 BasicCegarLoop]: 1174 mSDtfsCounter, 1266 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1266 SdHoareTripleChecker+Valid, 1174 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:12,869 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1266 Valid, 1174 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 132 Invalid, 1 Unknown, 0 Unchecked, 3.4s Time] [2021-11-23 02:36:12,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1671 states. [2021-11-23 02:36:12,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1671 to 1671. [2021-11-23 02:36:12,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1671 states, 1190 states have (on average 1.4638655462184873) internal successors, (1742), 1215 states have internal predecessors, (1742), 399 states have call successors, (399), 82 states have call predecessors, (399), 81 states have return successors, (395), 387 states have call predecessors, (395), 395 states have call successors, (395) [2021-11-23 02:36:12,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1671 states to 1671 states and 2536 transitions. [2021-11-23 02:36:12,994 INFO L78 Accepts]: Start accepts. Automaton has 1671 states and 2536 transitions. Word has length 173 [2021-11-23 02:36:12,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:12,996 INFO L470 AbstractCegarLoop]: Abstraction has 1671 states and 2536 transitions. [2021-11-23 02:36:12,996 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 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) [2021-11-23 02:36:12,996 INFO L276 IsEmpty]: Start isEmpty. Operand 1671 states and 2536 transitions. [2021-11-23 02:36:13,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-23 02:36:13,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:13,001 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:13,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:36:13,001 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:13,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:13,002 INFO L85 PathProgramCache]: Analyzing trace with hash 148093262, now seen corresponding path program 1 times [2021-11-23 02:36:13,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:13,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214204956] [2021-11-23 02:36:13,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:13,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:13,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:13,238 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2021-11-23 02:36:13,238 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:13,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214204956] [2021-11-23 02:36:13,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214204956] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:13,239 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:13,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:36:13,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673132030] [2021-11-23 02:36:13,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:13,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:36:13,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:13,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:36:13,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:36:13,242 INFO L87 Difference]: Start difference. First operand 1671 states and 2536 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 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) [2021-11-23 02:36:15,278 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 [] [2021-11-23 02:36:19,165 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:36:20,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:20,866 INFO L93 Difference]: Finished difference Result 3291 states and 4996 transitions. [2021-11-23 02:36:20,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:36:20,867 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 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 174 [2021-11-23 02:36:20,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:20,898 INFO L225 Difference]: With dead ends: 3291 [2021-11-23 02:36:20,898 INFO L226 Difference]: Without dead ends: 3288 [2021-11-23 02:36:20,901 INFO L932 BasicCegarLoop]: 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 [2021-11-23 02:36:20,903 INFO L933 BasicCegarLoop]: 1365 mSDtfsCounter, 1251 mSDsluCounter, 1249 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1251 SdHoareTripleChecker+Valid, 2487 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:20,904 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1251 Valid, 2487 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 259 Invalid, 2 Unknown, 0 Unchecked, 7.4s Time] [2021-11-23 02:36:20,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3288 states. [2021-11-23 02:36:21,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3288 to 3285. [2021-11-23 02:36:21,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3285 states, 2347 states have (on average 1.4669791222837665) internal successors, (3443), 2394 states have internal predecessors, (3443), 776 states have call successors, (776), 162 states have call predecessors, (776), 161 states have return successors, (772), 756 states have call predecessors, (772), 772 states have call successors, (772) [2021-11-23 02:36:21,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3285 states to 3285 states and 4991 transitions. [2021-11-23 02:36:21,134 INFO L78 Accepts]: Start accepts. Automaton has 3285 states and 4991 transitions. Word has length 174 [2021-11-23 02:36:21,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:21,135 INFO L470 AbstractCegarLoop]: Abstraction has 3285 states and 4991 transitions. [2021-11-23 02:36:21,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 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) [2021-11-23 02:36:21,136 INFO L276 IsEmpty]: Start isEmpty. Operand 3285 states and 4991 transitions. [2021-11-23 02:36:21,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-11-23 02:36:21,139 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:21,139 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:21,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:36:21,140 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:21,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:21,141 INFO L85 PathProgramCache]: Analyzing trace with hash 295626164, now seen corresponding path program 1 times [2021-11-23 02:36:21,141 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:21,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786010223] [2021-11-23 02:36:21,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:21,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:21,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:21,376 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2021-11-23 02:36:21,376 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:21,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786010223] [2021-11-23 02:36:21,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786010223] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:21,377 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:21,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:36:21,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034638082] [2021-11-23 02:36:21,377 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:21,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:36:21,378 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:21,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:36:21,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:36:21,379 INFO L87 Difference]: Start difference. First operand 3285 states and 4991 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 3 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) [2021-11-23 02:36:23,411 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 [] [2021-11-23 02:36:25,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:25,620 INFO L93 Difference]: Finished difference Result 3287 states and 4992 transitions. [2021-11-23 02:36:25,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:36:25,621 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 3 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 175 [2021-11-23 02:36:25,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:25,656 INFO L225 Difference]: With dead ends: 3287 [2021-11-23 02:36:25,656 INFO L226 Difference]: Without dead ends: 3284 [2021-11-23 02:36:25,659 INFO L932 BasicCegarLoop]: 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 [2021-11-23 02:36:25,663 INFO L933 BasicCegarLoop]: 1172 mSDtfsCounter, 1262 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1262 SdHoareTripleChecker+Valid, 1172 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:25,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1262 Valid, 1172 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 132 Invalid, 1 Unknown, 0 Unchecked, 4.1s Time] [2021-11-23 02:36:25,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3284 states. [2021-11-23 02:36:25,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3284 to 3284. [2021-11-23 02:36:25,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3284 states, 2347 states have (on average 1.4665530464422667) internal successors, (3442), 2393 states have internal predecessors, (3442), 775 states have call successors, (775), 162 states have call predecessors, (775), 161 states have return successors, (772), 756 states have call predecessors, (772), 772 states have call successors, (772) [2021-11-23 02:36:25,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3284 states to 3284 states and 4989 transitions. [2021-11-23 02:36:25,968 INFO L78 Accepts]: Start accepts. Automaton has 3284 states and 4989 transitions. Word has length 175 [2021-11-23 02:36:25,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:25,969 INFO L470 AbstractCegarLoop]: Abstraction has 3284 states and 4989 transitions. [2021-11-23 02:36:25,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 3 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) [2021-11-23 02:36:25,969 INFO L276 IsEmpty]: Start isEmpty. Operand 3284 states and 4989 transitions. [2021-11-23 02:36:25,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-23 02:36:25,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:25,974 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:25,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:36:25,974 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:25,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:25,976 INFO L85 PathProgramCache]: Analyzing trace with hash 574183697, now seen corresponding path program 1 times [2021-11-23 02:36:25,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:25,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631293768] [2021-11-23 02:36:25,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:25,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:26,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:26,229 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2021-11-23 02:36:26,230 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:26,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631293768] [2021-11-23 02:36:26,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631293768] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:26,230 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:26,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:36:26,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145548965] [2021-11-23 02:36:26,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:26,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:36:26,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:26,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:36:26,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:36:26,234 INFO L87 Difference]: Start difference. First operand 3284 states and 4989 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 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) [2021-11-23 02:36:28,267 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:30,461 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:33,385 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:36:33,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:33,755 INFO L93 Difference]: Finished difference Result 4880 states and 7421 transitions. [2021-11-23 02:36:33,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:36:33,756 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 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 176 [2021-11-23 02:36:33,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:33,795 INFO L225 Difference]: With dead ends: 4880 [2021-11-23 02:36:33,796 INFO L226 Difference]: Without dead ends: 4871 [2021-11-23 02:36:33,801 INFO L932 BasicCegarLoop]: 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 [2021-11-23 02:36:33,804 INFO L933 BasicCegarLoop]: 1361 mSDtfsCounter, 1223 mSDsluCounter, 1250 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 2 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1226 SdHoareTripleChecker+Valid, 2486 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:33,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1226 Valid, 2486 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 258 Invalid, 3 Unknown, 0 Unchecked, 7.3s Time] [2021-11-23 02:36:33,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4871 states. [2021-11-23 02:36:34,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4871 to 4865. [2021-11-23 02:36:34,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4865 states, 3485 states have (on average 1.4674318507890962) internal successors, (5114), 3550 states have internal predecessors, (5114), 1145 states have call successors, (1145), 239 states have call predecessors, (1145), 234 states have return successors, (1142), 1115 states have call predecessors, (1142), 1142 states have call successors, (1142) [2021-11-23 02:36:34,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4865 states to 4865 states and 7401 transitions. [2021-11-23 02:36:34,087 INFO L78 Accepts]: Start accepts. Automaton has 4865 states and 7401 transitions. Word has length 176 [2021-11-23 02:36:34,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:34,088 INFO L470 AbstractCegarLoop]: Abstraction has 4865 states and 7401 transitions. [2021-11-23 02:36:34,088 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 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) [2021-11-23 02:36:34,088 INFO L276 IsEmpty]: Start isEmpty. Operand 4865 states and 7401 transitions. [2021-11-23 02:36:34,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-11-23 02:36:34,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:34,134 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:34,135 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:36:34,135 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:34,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:34,136 INFO L85 PathProgramCache]: Analyzing trace with hash 1813531555, now seen corresponding path program 1 times [2021-11-23 02:36:34,136 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:34,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823302763] [2021-11-23 02:36:34,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:34,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:34,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:34,335 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 433 trivial. 0 not checked. [2021-11-23 02:36:34,336 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:34,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823302763] [2021-11-23 02:36:34,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823302763] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:34,336 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:34,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:36:34,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131531922] [2021-11-23 02:36:34,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:34,338 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:36:34,338 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:34,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:36:34,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:36:34,339 INFO L87 Difference]: Start difference. First operand 4865 states and 7401 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 2 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 02:36:36,034 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:40,034 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:36:40,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:40,220 INFO L93 Difference]: Finished difference Result 9942 states and 15119 transitions. [2021-11-23 02:36:40,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:36:40,221 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 2 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 250 [2021-11-23 02:36:40,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:40,258 INFO L225 Difference]: With dead ends: 9942 [2021-11-23 02:36:40,258 INFO L226 Difference]: Without dead ends: 5112 [2021-11-23 02:36:40,279 INFO L932 BasicCegarLoop]: 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 [2021-11-23 02:36:40,280 INFO L933 BasicCegarLoop]: 1190 mSDtfsCounter, 124 mSDsluCounter, 1141 mSDsCounter, 0 mSdLazyCounter, 368 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 2208 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 368 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:40,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 2208 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 368 Invalid, 1 Unknown, 0 Unchecked, 5.7s Time] [2021-11-23 02:36:40,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5112 states. [2021-11-23 02:36:40,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5112 to 5096. [2021-11-23 02:36:40,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5096 states, 3682 states have (on average 1.4687669744703966) internal successors, (5408), 3746 states have internal predecessors, (5408), 1170 states have call successors, (1170), 248 states have call predecessors, (1170), 243 states have return successors, (1167), 1141 states have call predecessors, (1167), 1167 states have call successors, (1167) [2021-11-23 02:36:40,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5096 states to 5096 states and 7745 transitions. [2021-11-23 02:36:40,584 INFO L78 Accepts]: Start accepts. Automaton has 5096 states and 7745 transitions. Word has length 250 [2021-11-23 02:36:40,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:40,585 INFO L470 AbstractCegarLoop]: Abstraction has 5096 states and 7745 transitions. [2021-11-23 02:36:40,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 2 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 02:36:40,586 INFO L276 IsEmpty]: Start isEmpty. Operand 5096 states and 7745 transitions. [2021-11-23 02:36:40,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2021-11-23 02:36:40,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:40,601 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:40,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:36:40,602 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:40,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:40,602 INFO L85 PathProgramCache]: Analyzing trace with hash 2138919815, now seen corresponding path program 1 times [2021-11-23 02:36:40,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:40,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490692905] [2021-11-23 02:36:40,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:40,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:40,760 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:36:40,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [843756127] [2021-11-23 02:36:40,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:40,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:40,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:40,766 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:40,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:36:41,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:41,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 3367 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:36:41,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:42,273 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-11-23 02:36:42,274 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:36:42,274 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:42,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490692905] [2021-11-23 02:36:42,275 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:36:42,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843756127] [2021-11-23 02:36:42,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843756127] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:42,275 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:42,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:36:42,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057643652] [2021-11-23 02:36:42,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:42,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:36:42,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:42,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:36:42,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:36:42,279 INFO L87 Difference]: Start difference. First operand 5096 states and 7745 transitions. Second operand has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:36:43,808 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:48,449 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:36:51,864 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:52,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:52,093 INFO L93 Difference]: Finished difference Result 13906 states and 21611 transitions. [2021-11-23 02:36:52,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:36:52,094 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) Word has length 271 [2021-11-23 02:36:52,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:52,287 INFO L225 Difference]: With dead ends: 13906 [2021-11-23 02:36:52,287 INFO L226 Difference]: Without dead ends: 8858 [2021-11-23 02:36:52,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 269 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:36:52,312 INFO L933 BasicCegarLoop]: 1657 mSDtfsCounter, 887 mSDsluCounter, 3265 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 124 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 993 SdHoareTripleChecker+Valid, 4634 SdHoareTripleChecker+Invalid, 587 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:52,312 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [993 Valid, 4634 Invalid, 587 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 461 Invalid, 2 Unknown, 0 Unchecked, 9.5s Time] [2021-11-23 02:36:52,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8858 states. [2021-11-23 02:36:52,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8858 to 5108. [2021-11-23 02:36:52,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5108 states, 3694 states have (on average 1.4672441797509475) internal successors, (5420), 3758 states have internal predecessors, (5420), 1170 states have call successors, (1170), 248 states have call predecessors, (1170), 243 states have return successors, (1167), 1141 states have call predecessors, (1167), 1167 states have call successors, (1167) [2021-11-23 02:36:52,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5108 states to 5108 states and 7757 transitions. [2021-11-23 02:36:52,698 INFO L78 Accepts]: Start accepts. Automaton has 5108 states and 7757 transitions. Word has length 271 [2021-11-23 02:36:52,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:52,700 INFO L470 AbstractCegarLoop]: Abstraction has 5108 states and 7757 transitions. [2021-11-23 02:36:52,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:36:52,700 INFO L276 IsEmpty]: Start isEmpty. Operand 5108 states and 7757 transitions. [2021-11-23 02:36:52,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2021-11-23 02:36:52,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:52,717 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:52,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:36:52,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:52,934 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:52,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:52,935 INFO L85 PathProgramCache]: Analyzing trace with hash -1389505489, now seen corresponding path program 1 times [2021-11-23 02:36:52,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:52,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126429054] [2021-11-23 02:36:52,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:52,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:53,061 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:36:53,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1454585397] [2021-11-23 02:36:53,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:53,062 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:53,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:53,063 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:53,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:36:54,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:54,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 3474 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:36:54,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:54,577 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-11-23 02:36:54,577 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:36:54,577 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:54,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126429054] [2021-11-23 02:36:54,578 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:36:54,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454585397] [2021-11-23 02:36:54,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454585397] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:54,578 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:54,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:36:54,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163032180] [2021-11-23 02:36:54,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:54,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:36:54,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:54,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:36:54,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:36:54,580 INFO L87 Difference]: Start difference. First operand 5108 states and 7757 transitions. Second operand has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:36:56,046 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:57,494 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:03,401 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:03,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:37:03,996 INFO L93 Difference]: Finished difference Result 13656 states and 21200 transitions. [2021-11-23 02:37:03,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:37:03,997 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) Word has length 284 [2021-11-23 02:37:03,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:37:04,051 INFO L225 Difference]: With dead ends: 13656 [2021-11-23 02:37:04,051 INFO L226 Difference]: Without dead ends: 8596 [2021-11-23 02:37:04,075 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:37:04,076 INFO L933 BasicCegarLoop]: 1697 mSDtfsCounter, 859 mSDsluCounter, 3166 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 115 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 933 SdHoareTripleChecker+Valid, 4578 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:37:04,076 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [933 Valid, 4578 Invalid, 567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 451 Invalid, 1 Unknown, 0 Unchecked, 9.1s Time] [2021-11-23 02:37:04,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8596 states. [2021-11-23 02:37:04,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8596 to 5120. [2021-11-23 02:37:04,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5120 states, 3706 states have (on average 1.4657312466270913) internal successors, (5432), 3770 states have internal predecessors, (5432), 1170 states have call successors, (1170), 248 states have call predecessors, (1170), 243 states have return successors, (1167), 1141 states have call predecessors, (1167), 1167 states have call successors, (1167) [2021-11-23 02:37:04,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5120 states to 5120 states and 7769 transitions. [2021-11-23 02:37:04,501 INFO L78 Accepts]: Start accepts. Automaton has 5120 states and 7769 transitions. Word has length 284 [2021-11-23 02:37:04,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:37:04,502 INFO L470 AbstractCegarLoop]: Abstraction has 5120 states and 7769 transitions. [2021-11-23 02:37:04,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:37:04,503 INFO L276 IsEmpty]: Start isEmpty. Operand 5120 states and 7769 transitions. [2021-11-23 02:37:04,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2021-11-23 02:37:04,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:37:04,518 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:37:04,562 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:37:04,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:37:04,745 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:37:04,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:37:04,746 INFO L85 PathProgramCache]: Analyzing trace with hash -338892400, now seen corresponding path program 1 times [2021-11-23 02:37:04,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:37:04,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342170237] [2021-11-23 02:37:04,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:37:04,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:37:04,868 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:37:04,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1498741690] [2021-11-23 02:37:04,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:37:04,869 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:37:04,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:37:04,870 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:37:04,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:37:05,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:37:05,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 3469 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:37:05,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:37:06,201 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-11-23 02:37:06,201 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:37:06,201 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:37:06,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342170237] [2021-11-23 02:37:06,202 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:37:06,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498741690] [2021-11-23 02:37:06,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498741690] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:37:06,202 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:37:06,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:37:06,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716632068] [2021-11-23 02:37:06,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:37:06,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:37:06,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:37:06,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:37:06,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:37:06,204 INFO L87 Difference]: Start difference. First operand 5120 states and 7769 transitions. Second operand has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:37:08,230 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 [] [2021-11-23 02:37:13,330 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:37:16,849 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:17,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:37:17,115 INFO L93 Difference]: Finished difference Result 14602 states and 22739 transitions. [2021-11-23 02:37:17,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:37:17,116 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) Word has length 284 [2021-11-23 02:37:17,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:37:17,164 INFO L225 Difference]: With dead ends: 14602 [2021-11-23 02:37:17,165 INFO L226 Difference]: Without dead ends: 9530 [2021-11-23 02:37:17,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:37:17,193 INFO L933 BasicCegarLoop]: 1831 mSDtfsCounter, 1004 mSDsluCounter, 3485 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 103 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1133 SdHoareTripleChecker+Valid, 5015 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:37:17,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1133 Valid, 5015 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 498 Invalid, 3 Unknown, 0 Unchecked, 10.5s Time] [2021-11-23 02:37:17,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9530 states. [2021-11-23 02:37:17,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9530 to 5132. [2021-11-23 02:37:17,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5132 states, 3718 states have (on average 1.464228079612695) internal successors, (5444), 3782 states have internal predecessors, (5444), 1170 states have call successors, (1170), 248 states have call predecessors, (1170), 243 states have return successors, (1167), 1141 states have call predecessors, (1167), 1167 states have call successors, (1167) [2021-11-23 02:37:17,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5132 states to 5132 states and 7781 transitions. [2021-11-23 02:37:17,638 INFO L78 Accepts]: Start accepts. Automaton has 5132 states and 7781 transitions. Word has length 284 [2021-11-23 02:37:17,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:37:17,639 INFO L470 AbstractCegarLoop]: Abstraction has 5132 states and 7781 transitions. [2021-11-23 02:37:17,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:37:17,639 INFO L276 IsEmpty]: Start isEmpty. Operand 5132 states and 7781 transitions. [2021-11-23 02:37:17,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2021-11-23 02:37:17,654 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:37:17,655 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:37:17,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:37:17,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:37:17,870 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:37:17,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:37:17,871 INFO L85 PathProgramCache]: Analyzing trace with hash 1190193967, now seen corresponding path program 1 times [2021-11-23 02:37:17,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:37:17,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802441297] [2021-11-23 02:37:17,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:37:17,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:37:17,995 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:37:17,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [256330572] [2021-11-23 02:37:17,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:37:17,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:37:17,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:37:17,997 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:37:18,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:37:18,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:37:18,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 3469 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:37:18,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:37:19,272 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-11-23 02:37:19,272 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:37:19,273 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:37:19,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802441297] [2021-11-23 02:37:19,273 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:37:19,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256330572] [2021-11-23 02:37:19,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256330572] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:37:19,273 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:37:19,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:37:19,274 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500545541] [2021-11-23 02:37:19,274 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:37:19,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:37:19,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:37:19,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:37:19,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:37:19,276 INFO L87 Difference]: Start difference. First operand 5132 states and 7781 transitions. Second operand has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:37:21,304 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:23,574 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:26,843 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:37:29,167 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:29,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:37:29,319 INFO L93 Difference]: Finished difference Result 13215 states and 20405 transitions. [2021-11-23 02:37:29,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:37:29,320 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) Word has length 284 [2021-11-23 02:37:29,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:37:29,430 INFO L225 Difference]: With dead ends: 13215 [2021-11-23 02:37:29,431 INFO L226 Difference]: Without dead ends: 8131 [2021-11-23 02:37:29,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:37:29,453 INFO L933 BasicCegarLoop]: 1705 mSDtfsCounter, 542 mSDsluCounter, 1374 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 1 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 653 SdHoareTripleChecker+Valid, 2953 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:37:29,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [653 Valid, 2953 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 285 Invalid, 4 Unknown, 0 Unchecked, 9.8s Time] [2021-11-23 02:37:29,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8131 states. [2021-11-23 02:37:29,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8131 to 5246. [2021-11-23 02:37:29,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5246 states, 3808 states have (on average 1.4642857142857142) internal successors, (5576), 3872 states have internal predecessors, (5576), 1194 states have call successors, (1194), 248 states have call predecessors, (1194), 243 states have return successors, (1191), 1165 states have call predecessors, (1191), 1191 states have call successors, (1191) [2021-11-23 02:37:29,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5246 states to 5246 states and 7961 transitions. [2021-11-23 02:37:29,854 INFO L78 Accepts]: Start accepts. Automaton has 5246 states and 7961 transitions. Word has length 284 [2021-11-23 02:37:29,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:37:29,855 INFO L470 AbstractCegarLoop]: Abstraction has 5246 states and 7961 transitions. [2021-11-23 02:37:29,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:37:29,855 INFO L276 IsEmpty]: Start isEmpty. Operand 5246 states and 7961 transitions. [2021-11-23 02:37:29,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2021-11-23 02:37:29,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:37:29,867 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:37:29,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:37:30,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:37:30,093 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:37:30,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:37:30,094 INFO L85 PathProgramCache]: Analyzing trace with hash 589136355, now seen corresponding path program 1 times [2021-11-23 02:37:30,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:37:30,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1925333020] [2021-11-23 02:37:30,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:37:30,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:37:30,195 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:37:30,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1117826420] [2021-11-23 02:37:30,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:37:30,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:37:30,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:37:30,197 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:37:30,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:37:31,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:37:31,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 3466 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:37:31,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:37:31,591 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-11-23 02:37:31,591 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:37:31,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:37:31,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1925333020] [2021-11-23 02:37:31,592 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:37:31,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117826420] [2021-11-23 02:37:31,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117826420] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:37:31,592 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:37:31,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:37:31,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584468437] [2021-11-23 02:37:31,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:37:31,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:37:31,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:37:31,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:37:31,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:37:31,594 INFO L87 Difference]: Start difference. First operand 5246 states and 7961 transitions. Second operand has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:37:33,627 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:40,571 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:42,804 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:42,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:37:42,922 INFO L93 Difference]: Finished difference Result 13497 states and 21055 transitions. [2021-11-23 02:37:42,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:37:42,922 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) Word has length 285 [2021-11-23 02:37:42,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:37:42,957 INFO L225 Difference]: With dead ends: 13497 [2021-11-23 02:37:42,957 INFO L226 Difference]: Without dead ends: 9950 [2021-11-23 02:37:42,970 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:37:42,971 INFO L933 BasicCegarLoop]: 1833 mSDtfsCounter, 1068 mSDsluCounter, 3518 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 103 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1204 SdHoareTripleChecker+Valid, 5043 SdHoareTripleChecker+Invalid, 611 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:37:42,971 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1204 Valid, 5043 Invalid, 611 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 505 Invalid, 3 Unknown, 0 Unchecked, 10.9s Time] [2021-11-23 02:37:42,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9950 states. [2021-11-23 02:37:43,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9950 to 5258. [2021-11-23 02:37:43,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5258 states, 3820 states have (on average 1.46282722513089) internal successors, (5588), 3884 states have internal predecessors, (5588), 1194 states have call successors, (1194), 248 states have call predecessors, (1194), 243 states have return successors, (1191), 1165 states have call predecessors, (1191), 1191 states have call successors, (1191) [2021-11-23 02:37:43,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5258 states to 5258 states and 7973 transitions. [2021-11-23 02:37:43,373 INFO L78 Accepts]: Start accepts. Automaton has 5258 states and 7973 transitions. Word has length 285 [2021-11-23 02:37:43,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:37:43,373 INFO L470 AbstractCegarLoop]: Abstraction has 5258 states and 7973 transitions. [2021-11-23 02:37:43,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:37:43,374 INFO L276 IsEmpty]: Start isEmpty. Operand 5258 states and 7973 transitions. [2021-11-23 02:37:43,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2021-11-23 02:37:43,385 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:37:43,385 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:37:43,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:37:43,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:37:43,605 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:37:43,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:37:43,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1703352346, now seen corresponding path program 1 times [2021-11-23 02:37:43,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:37:43,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457527017] [2021-11-23 02:37:43,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:37:43,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:37:43,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:37:44,005 INFO L134 CoverageAnalysis]: Checked inductivity of 524 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-11-23 02:37:44,005 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:37:44,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457527017] [2021-11-23 02:37:44,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457527017] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:37:44,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238073158] [2021-11-23 02:37:44,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:37:44,006 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:37:44,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:37:44,009 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:37:44,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:37:44,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:37:44,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 3495 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:37:44,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:37:45,601 INFO L134 CoverageAnalysis]: Checked inductivity of 524 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2021-11-23 02:37:45,601 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:37:45,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [238073158] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:37:45,601 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:37:45,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 7 [2021-11-23 02:37:45,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296738841] [2021-11-23 02:37:45,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:37:45,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:37:45,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:37:45,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:37:45,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:37:45,603 INFO L87 Difference]: Start difference. First operand 5258 states and 7973 transitions. Second operand has 5 states, 5 states have (on average 24.0) internal successors, (120), 5 states have internal predecessors, (120), 3 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (31), 2 states have call predecessors, (31), 2 states have call successors, (31) [2021-11-23 02:37:46,606 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:49,792 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.90s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:37:58,218 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:38:02,015 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:04,298 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:06,436 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:06,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:38:06,595 INFO L93 Difference]: Finished difference Result 11369 states and 17351 transitions. [2021-11-23 02:38:06,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:38:06,596 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 24.0) internal successors, (120), 5 states have internal predecessors, (120), 3 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (31), 2 states have call predecessors, (31), 2 states have call successors, (31) Word has length 286 [2021-11-23 02:38:06,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:38:06,636 INFO L225 Difference]: With dead ends: 11369 [2021-11-23 02:38:06,637 INFO L226 Difference]: Without dead ends: 11361 [2021-11-23 02:38:06,641 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:38:06,642 INFO L933 BasicCegarLoop]: 2476 mSDtfsCounter, 3087 mSDsluCounter, 4434 mSDsCounter, 0 mSdLazyCounter, 2261 mSolverCounterSat, 112 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3136 SdHoareTripleChecker+Valid, 6398 SdHoareTripleChecker+Invalid, 2377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 2261 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:38:06,642 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3136 Valid, 6398 Invalid, 2377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 2261 Invalid, 4 Unknown, 0 Unchecked, 20.5s Time] [2021-11-23 02:38:06,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11361 states. [2021-11-23 02:38:07,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11361 to 10423. [2021-11-23 02:38:07,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10423 states, 7576 states have (on average 1.4654171066525872) internal successors, (11102), 7720 states have internal predecessors, (11102), 2365 states have call successors, (2365), 490 states have call predecessors, (2365), 481 states have return successors, (2362), 2292 states have call predecessors, (2362), 2362 states have call successors, (2362) [2021-11-23 02:38:07,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10423 states to 10423 states and 15829 transitions. [2021-11-23 02:38:07,381 INFO L78 Accepts]: Start accepts. Automaton has 10423 states and 15829 transitions. Word has length 286 [2021-11-23 02:38:07,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:38:07,382 INFO L470 AbstractCegarLoop]: Abstraction has 10423 states and 15829 transitions. [2021-11-23 02:38:07,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 24.0) internal successors, (120), 5 states have internal predecessors, (120), 3 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (31), 2 states have call predecessors, (31), 2 states have call successors, (31) [2021-11-23 02:38:07,382 INFO L276 IsEmpty]: Start isEmpty. Operand 10423 states and 15829 transitions. [2021-11-23 02:38:07,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2021-11-23 02:38:07,402 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:38:07,402 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:38:07,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:38:07,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:38:07,625 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:38:07,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:38:07,625 INFO L85 PathProgramCache]: Analyzing trace with hash 1575587505, now seen corresponding path program 1 times [2021-11-23 02:38:07,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:38:07,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801230038] [2021-11-23 02:38:07,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:38:07,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:38:07,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:38:07,920 INFO L134 CoverageAnalysis]: Checked inductivity of 524 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-11-23 02:38:07,920 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:38:07,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801230038] [2021-11-23 02:38:07,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801230038] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:38:07,921 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:38:07,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:38:07,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648114214] [2021-11-23 02:38:07,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:38:07,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:38:07,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:38:07,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:38:07,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:38:07,924 INFO L87 Difference]: Start difference. First operand 10423 states and 15829 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 2 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 2 states have call predecessors, (29), 2 states have call successors, (29) [2021-11-23 02:38:09,954 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 [] [2021-11-23 02:38:12,233 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:15,545 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:38:16,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:38:16,105 INFO L93 Difference]: Finished difference Result 27080 states and 41867 transitions. [2021-11-23 02:38:16,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:38:16,105 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 2 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 2 states have call predecessors, (29), 2 states have call successors, (29) Word has length 287 [2021-11-23 02:38:16,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:38:16,172 INFO L225 Difference]: With dead ends: 27080 [2021-11-23 02:38:16,172 INFO L226 Difference]: Without dead ends: 16705 [2021-11-23 02:38:16,202 INFO L932 BasicCegarLoop]: 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 [2021-11-23 02:38:16,203 INFO L933 BasicCegarLoop]: 1530 mSDtfsCounter, 550 mSDsluCounter, 1347 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 0 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 662 SdHoareTripleChecker+Valid, 2749 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:38:16,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [662 Valid, 2749 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 274 Invalid, 3 Unknown, 0 Unchecked, 7.6s Time] [2021-11-23 02:38:16,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16705 states. [2021-11-23 02:38:17,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16705 to 10435. [2021-11-23 02:38:17,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10435 states, 7588 states have (on average 1.4646810753821824) internal successors, (11114), 7732 states have internal predecessors, (11114), 2365 states have call successors, (2365), 490 states have call predecessors, (2365), 481 states have return successors, (2362), 2292 states have call predecessors, (2362), 2362 states have call successors, (2362) [2021-11-23 02:38:17,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10435 states to 10435 states and 15841 transitions. [2021-11-23 02:38:17,154 INFO L78 Accepts]: Start accepts. Automaton has 10435 states and 15841 transitions. Word has length 287 [2021-11-23 02:38:17,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:38:17,155 INFO L470 AbstractCegarLoop]: Abstraction has 10435 states and 15841 transitions. [2021-11-23 02:38:17,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 2 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 2 states have call predecessors, (29), 2 states have call successors, (29) [2021-11-23 02:38:17,155 INFO L276 IsEmpty]: Start isEmpty. Operand 10435 states and 15841 transitions. [2021-11-23 02:38:17,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2021-11-23 02:38:17,173 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:38:17,174 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:38:17,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:38:17,174 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:38:17,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:38:17,175 INFO L85 PathProgramCache]: Analyzing trace with hash 843414405, now seen corresponding path program 1 times [2021-11-23 02:38:17,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:38:17,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769711657] [2021-11-23 02:38:17,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:38:17,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:38:17,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:38:18,193 INFO L134 CoverageAnalysis]: Checked inductivity of 524 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-11-23 02:38:18,194 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:38:18,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769711657] [2021-11-23 02:38:18,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769711657] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:38:18,194 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:38:18,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-23 02:38:18,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411132058] [2021-11-23 02:38:18,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:38:18,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 02:38:18,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:38:18,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 02:38:18,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:38:18,197 INFO L87 Difference]: Start difference. First operand 10435 states and 15841 transitions. Second operand has 12 states, 7 states have (on average 16.714285714285715) internal successors, (117), 9 states have internal predecessors, (117), 4 states have call successors, (30), 2 states have call predecessors, (30), 4 states have return successors, (29), 5 states have call predecessors, (29), 4 states have call successors, (29) [2021-11-23 02:38:20,232 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:24,584 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:34,724 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:38:37,522 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:37,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:38:37,687 INFO L93 Difference]: Finished difference Result 26342 states and 40718 transitions. [2021-11-23 02:38:37,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:38:37,688 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 7 states have (on average 16.714285714285715) internal successors, (117), 9 states have internal predecessors, (117), 4 states have call successors, (30), 2 states have call predecessors, (30), 4 states have return successors, (29), 5 states have call predecessors, (29), 4 states have call successors, (29) Word has length 288 [2021-11-23 02:38:37,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:38:37,746 INFO L225 Difference]: With dead ends: 26342 [2021-11-23 02:38:37,746 INFO L226 Difference]: Without dead ends: 15955 [2021-11-23 02:38:37,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:38:37,776 INFO L933 BasicCegarLoop]: 1582 mSDtfsCounter, 873 mSDsluCounter, 16694 mSDsCounter, 0 mSdLazyCounter, 1706 mSolverCounterSat, 152 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 925 SdHoareTripleChecker+Valid, 16857 SdHoareTripleChecker+Invalid, 1861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 1706 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:38:37,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [925 Valid, 16857 Invalid, 1861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 1706 Invalid, 3 Unknown, 0 Unchecked, 18.3s Time] [2021-11-23 02:38:37,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15955 states. [2021-11-23 02:38:38,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15955 to 10483. [2021-11-23 02:38:38,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10483 states, 7624 states have (on average 1.4624868835257083) internal successors, (11150), 7768 states have internal predecessors, (11150), 2377 states have call successors, (2377), 490 states have call predecessors, (2377), 481 states have return successors, (2374), 2304 states have call predecessors, (2374), 2374 states have call successors, (2374) [2021-11-23 02:38:38,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10483 states to 10483 states and 15901 transitions. [2021-11-23 02:38:38,745 INFO L78 Accepts]: Start accepts. Automaton has 10483 states and 15901 transitions. Word has length 288 [2021-11-23 02:38:38,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:38:38,745 INFO L470 AbstractCegarLoop]: Abstraction has 10483 states and 15901 transitions. [2021-11-23 02:38:38,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 7 states have (on average 16.714285714285715) internal successors, (117), 9 states have internal predecessors, (117), 4 states have call successors, (30), 2 states have call predecessors, (30), 4 states have return successors, (29), 5 states have call predecessors, (29), 4 states have call successors, (29) [2021-11-23 02:38:38,745 INFO L276 IsEmpty]: Start isEmpty. Operand 10483 states and 15901 transitions. [2021-11-23 02:38:38,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2021-11-23 02:38:38,767 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:38:38,768 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:38:38,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:38:38,768 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:38:38,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:38:38,769 INFO L85 PathProgramCache]: Analyzing trace with hash 1639066039, now seen corresponding path program 1 times [2021-11-23 02:38:38,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:38:38,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129982691] [2021-11-23 02:38:38,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:38:38,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:38:38,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:38:39,128 INFO L134 CoverageAnalysis]: Checked inductivity of 524 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-11-23 02:38:39,128 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:38:39,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129982691] [2021-11-23 02:38:39,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129982691] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:38:39,129 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:38:39,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:38:39,129 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487301827] [2021-11-23 02:38:39,129 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:38:39,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:38:39,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:38:39,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:38:39,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:38:39,131 INFO L87 Difference]: Start difference. First operand 10483 states and 15901 transitions. Second operand has 5 states, 5 states have (on average 24.2) internal successors, (121), 4 states have internal predecessors, (121), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 3 states have call predecessors, (29), 2 states have call successors, (29) [2021-11-23 02:38:41,162 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:43,156 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.50s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:45,902 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.90s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:50,056 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:38:52,598 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:54,722 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:56,895 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:38:57,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:38:57,065 INFO L93 Difference]: Finished difference Result 27176 states and 41987 transitions. [2021-11-23 02:38:57,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:38:57,066 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 24.2) internal successors, (121), 4 states have internal predecessors, (121), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 3 states have call predecessors, (29), 2 states have call successors, (29) Word has length 292 [2021-11-23 02:38:57,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:38:57,114 INFO L225 Difference]: With dead ends: 27176 [2021-11-23 02:38:57,114 INFO L226 Difference]: Without dead ends: 16741 [2021-11-23 02:38:57,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:38:57,138 INFO L933 BasicCegarLoop]: 1558 mSDtfsCounter, 545 mSDsluCounter, 4751 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 0 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 656 SdHoareTripleChecker+Valid, 5894 SdHoareTripleChecker+Invalid, 575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:38:57,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [656 Valid, 5894 Invalid, 575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 570 Invalid, 5 Unknown, 0 Unchecked, 17.0s Time] [2021-11-23 02:38:57,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16741 states. [2021-11-23 02:38:58,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16741 to 10531. [2021-11-23 02:38:58,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10531 states, 7660 states have (on average 1.4603133159268928) internal successors, (11186), 7804 states have internal predecessors, (11186), 2377 states have call successors, (2377), 490 states have call predecessors, (2377), 493 states have return successors, (2410), 2316 states have call predecessors, (2410), 2374 states have call successors, (2410) [2021-11-23 02:38:58,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10531 states to 10531 states and 15973 transitions. [2021-11-23 02:38:58,249 INFO L78 Accepts]: Start accepts. Automaton has 10531 states and 15973 transitions. Word has length 292 [2021-11-23 02:38:58,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:38:58,250 INFO L470 AbstractCegarLoop]: Abstraction has 10531 states and 15973 transitions. [2021-11-23 02:38:58,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 24.2) internal successors, (121), 4 states have internal predecessors, (121), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 3 states have call predecessors, (29), 2 states have call successors, (29) [2021-11-23 02:38:58,251 INFO L276 IsEmpty]: Start isEmpty. Operand 10531 states and 15973 transitions. [2021-11-23 02:38:58,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2021-11-23 02:38:58,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:38:58,275 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:38:58,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:38:58,275 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:38:58,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:38:58,276 INFO L85 PathProgramCache]: Analyzing trace with hash 923461111, now seen corresponding path program 1 times [2021-11-23 02:38:58,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:38:58,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965862126] [2021-11-23 02:38:58,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:38:58,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:38:58,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:38:59,289 INFO L134 CoverageAnalysis]: Checked inductivity of 524 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-11-23 02:38:59,290 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:38:59,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965862126] [2021-11-23 02:38:59,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965862126] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:38:59,290 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:38:59,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-23 02:38:59,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024367636] [2021-11-23 02:38:59,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:38:59,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 02:38:59,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:38:59,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 02:38:59,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:38:59,292 INFO L87 Difference]: Start difference. First operand 10531 states and 15973 transitions. Second operand has 12 states, 7 states have (on average 17.428571428571427) internal successors, (122), 9 states have internal predecessors, (122), 4 states have call successors, (31), 2 states have call predecessors, (31), 4 states have return successors, (30), 5 states have call predecessors, (30), 4 states have call successors, (30) [2021-11-23 02:39:01,055 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.76s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:39:05,879 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:39:14,720 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2021-11-23 02:39:17,643 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:39:19,787 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:39:21,958 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:39:22,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:39:22,240 INFO L93 Difference]: Finished difference Result 26534 states and 40982 transitions. [2021-11-23 02:39:22,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:39:22,241 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 7 states have (on average 17.428571428571427) internal successors, (122), 9 states have internal predecessors, (122), 4 states have call successors, (31), 2 states have call predecessors, (31), 4 states have return successors, (30), 5 states have call predecessors, (30), 4 states have call successors, (30) Word has length 295 [2021-11-23 02:39:22,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:39:22,284 INFO L225 Difference]: With dead ends: 26534 [2021-11-23 02:39:22,284 INFO L226 Difference]: Without dead ends: 16051 [2021-11-23 02:39:22,305 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:39:22,306 INFO L933 BasicCegarLoop]: 1587 mSDtfsCounter, 871 mSDsluCounter, 16756 mSDsCounter, 0 mSdLazyCounter, 1737 mSolverCounterSat, 152 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 923 SdHoareTripleChecker+Valid, 16897 SdHoareTripleChecker+Invalid, 1893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 1737 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:39:22,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [923 Valid, 16897 Invalid, 1893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 1737 Invalid, 4 Unknown, 0 Unchecked, 21.8s Time] [2021-11-23 02:39:22,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16051 states. [2021-11-23 02:39:23,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16051 to 10531. [2021-11-23 02:39:23,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10531 states, 7660 states have (on average 1.4603133159268928) internal successors, (11186), 7804 states have internal predecessors, (11186), 2377 states have call successors, (2377), 490 states have call predecessors, (2377), 493 states have return successors, (2410), 2316 states have call predecessors, (2410), 2374 states have call successors, (2410) [2021-11-23 02:39:23,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10531 states to 10531 states and 15973 transitions. [2021-11-23 02:39:23,113 INFO L78 Accepts]: Start accepts. Automaton has 10531 states and 15973 transitions. Word has length 295 [2021-11-23 02:39:23,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:39:23,114 INFO L470 AbstractCegarLoop]: Abstraction has 10531 states and 15973 transitions. [2021-11-23 02:39:23,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 7 states have (on average 17.428571428571427) internal successors, (122), 9 states have internal predecessors, (122), 4 states have call successors, (31), 2 states have call predecessors, (31), 4 states have return successors, (30), 5 states have call predecessors, (30), 4 states have call successors, (30) [2021-11-23 02:39:23,115 INFO L276 IsEmpty]: Start isEmpty. Operand 10531 states and 15973 transitions. [2021-11-23 02:39:23,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-23 02:39:23,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:39:23,130 INFO L514 BasicCegarLoop]: trace histogram [11, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:39:23,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:39:23,131 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:39:23,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:39:23,131 INFO L85 PathProgramCache]: Analyzing trace with hash -330637040, now seen corresponding path program 1 times [2021-11-23 02:39:23,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:39:23,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591567557] [2021-11-23 02:39:23,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:39:23,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:39:23,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:39:23,992 INFO L134 CoverageAnalysis]: Checked inductivity of 568 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 538 trivial. 0 not checked. [2021-11-23 02:39:23,993 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:39:23,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591567557] [2021-11-23 02:39:23,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [591567557] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:39:23,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1665453391] [2021-11-23 02:39:23,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:39:23,995 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:39:23,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:39:23,998 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:39:24,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a22acf1-aba9-4edc-8bb5-ad28a98d7b1f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:39:24,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:39:24,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 3617 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-23 02:39:24,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:39:25,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:39:25,690 INFO L354 Elim1Store]: treesize reduction 164, result has 11.4 percent of original size [2021-11-23 02:39:25,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 30 treesize of output 38 [2021-11-23 02:39:26,527 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:39:26,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:39:26,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 02:39:26,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 02:39:26,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 02:39:26,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:26,825 INFO L354 Elim1Store]: treesize reduction 13, result has 23.5 percent of original size [2021-11-23 02:39:26,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 14 [2021-11-23 02:39:27,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:27,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:27,793 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:39:27,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:27,795 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:39:27,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:27,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:27,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:27,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:39:27,806 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:39:27,807 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:44:48,548 WARN L227 SmtUtils]: Spent 5.34m on a formula simplification. DAG size of input: 2764 DAG size of output: 782 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-23 02:44:48,554 INFO L354 Elim1Store]: treesize reduction 56014, result has 11.6 percent of original size [2021-11-23 02:44:48,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 34 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 36 new quantified variables, introduced 273 case distinctions, treesize of input 32342 treesize of output 20766