./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/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 32bit --witnessprinter.graph.data.programhash 2e745a133311e60f1a9e202bf4fcb9b524a944d790f4c1df2987f4b8dfd5e08b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:49:01,251 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:49:01,256 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:49:01,313 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:49:01,314 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:49:01,316 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:49:01,318 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:49:01,321 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:49:01,323 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:49:01,324 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:49:01,326 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:49:01,328 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:49:01,328 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:49:01,330 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:49:01,332 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:49:01,334 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:49:01,335 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:49:01,337 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:49:01,340 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:49:01,343 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:49:01,345 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:49:01,347 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:49:01,349 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:49:01,350 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:49:01,355 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:49:01,360 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:49:01,360 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:49:01,362 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:49:01,364 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:49:01,366 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:49:01,367 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:49:01,368 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:49:01,370 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:49:01,373 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:49:01,374 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:49:01,376 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:49:01,377 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:49:01,378 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:49:01,378 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:49:01,379 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:49:01,380 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:49:01,381 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:49:01,429 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:49:01,429 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:49:01,437 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:49:01,437 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:49:01,438 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:49:01,438 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:49:01,439 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:49:01,439 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:49:01,439 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:49:01,439 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:49:01,441 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:49:01,441 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:49:01,441 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:49:01,442 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:49:01,442 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:49:01,442 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:49:01,442 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:49:01,443 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:49:01,444 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:49:01,444 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:49:01,445 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:49:01,445 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:49:01,445 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:49:01,445 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:49:01,446 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:49:01,446 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:49:01,448 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:49:01,448 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:49:01,448 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:49:01,448 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:49:01,449 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:49:01,449 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:49:01,450 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:49:01,450 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:49:01,450 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:49:01,450 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:49:01,450 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:49:01,450 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:49:01,450 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:49:01,451 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:49:01,451 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:49:01,451 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e745a133311e60f1a9e202bf4fcb9b524a944d790f4c1df2987f4b8dfd5e08b [2021-11-23 02:49:01,733 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:49:01,768 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:49:01,770 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:49:01,772 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:49:01,772 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:49:01,774 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c [2021-11-23 02:49:01,847 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/data/294df5cfa/575e5d85760f4d79841a078745922119/FLAG6b13fee1d [2021-11-23 02:49:02,400 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:49:02,406 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c [2021-11-23 02:49:02,417 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/data/294df5cfa/575e5d85760f4d79841a078745922119/FLAG6b13fee1d [2021-11-23 02:49:02,717 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/data/294df5cfa/575e5d85760f4d79841a078745922119 [2021-11-23 02:49:02,720 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:49:02,722 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:49:02,724 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:49:02,725 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:49:02,729 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:49:02,730 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:49:02" (1/1) ... [2021-11-23 02:49:02,731 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@41dd964d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:02, skipping insertion in model container [2021-11-23 02:49:02,731 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:49:02" (1/1) ... [2021-11-23 02:49:02,742 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:49:02,779 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:49:03,006 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[1995,2008] [2021-11-23 02:49:03,012 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[2389,2402] [2021-11-23 02:49:03,061 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:49:03,072 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:49:03,088 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[1995,2008] [2021-11-23 02:49:03,090 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[2389,2402] [2021-11-23 02:49:03,128 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:49:03,147 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:49:03,147 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03 WrapperNode [2021-11-23 02:49:03,148 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:49:03,149 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:49:03,150 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:49:03,150 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:49:03,160 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (1/1) ... [2021-11-23 02:49:03,173 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (1/1) ... [2021-11-23 02:49:03,200 INFO L137 Inliner]: procedures = 27, calls = 19, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 74 [2021-11-23 02:49:03,200 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:49:03,201 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:49:03,201 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:49:03,202 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:49:03,213 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (1/1) ... [2021-11-23 02:49:03,213 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (1/1) ... [2021-11-23 02:49:03,217 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (1/1) ... [2021-11-23 02:49:03,217 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (1/1) ... [2021-11-23 02:49:03,227 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (1/1) ... [2021-11-23 02:49:03,234 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (1/1) ... [2021-11-23 02:49:03,250 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (1/1) ... [2021-11-23 02:49:03,254 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:49:03,255 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:49:03,255 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:49:03,256 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:49:03,257 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (1/1) ... [2021-11-23 02:49:03,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:49:03,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:03,339 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:49:03,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:49:03,408 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:49:03,409 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-11-23 02:49:03,409 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-11-23 02:49:03,409 INFO L130 BoogieDeclarations]: Found specification of procedure addflt [2021-11-23 02:49:03,410 INFO L138 BoogieDeclarations]: Found implementation of procedure addflt [2021-11-23 02:49:03,410 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:49:03,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:49:03,410 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:49:03,411 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 02:49:03,411 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 02:49:03,547 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:49:03,550 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:49:03,854 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:49:03,931 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:49:03,932 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:49:03,936 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:03 BoogieIcfgContainer [2021-11-23 02:49:03,936 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:49:03,939 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:49:03,939 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:49:03,943 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:49:03,944 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:49:02" (1/3) ... [2021-11-23 02:49:03,945 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ca3796c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:49:03, skipping insertion in model container [2021-11-23 02:49:03,945 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:03" (2/3) ... [2021-11-23 02:49:03,945 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ca3796c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:49:03, skipping insertion in model container [2021-11-23 02:49:03,946 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:03" (3/3) ... [2021-11-23 02:49:03,948 INFO L111 eAbstractionObserver]: Analyzing ICFG square_8+soft_float_4-2a.c.cil.c [2021-11-23 02:49:03,955 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:49:03,955 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:49:04,038 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:49:04,049 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 02:49:04,050 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:49:04,092 INFO L276 IsEmpty]: Start isEmpty. Operand has 49 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 37 states have internal predecessors, (52), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 02:49:04,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-23 02:49:04,098 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:04,099 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-23 02:49:04,100 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:04,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:04,107 INFO L85 PathProgramCache]: Analyzing trace with hash 6807338, now seen corresponding path program 1 times [2021-11-23 02:49:04,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:04,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411961725] [2021-11-23 02:49:04,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:04,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:04,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-23 02:49:04,291 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-23 02:49:04,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-23 02:49:04,353 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-23 02:49:04,355 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-23 02:49:04,357 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (1 of 2 remaining) [2021-11-23 02:49:04,361 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2021-11-23 02:49:04,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:49:04,369 INFO L732 BasicCegarLoop]: Path program histogram: [1] [2021-11-23 02:49:04,373 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-23 02:49:04,406 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 02:49:04 BoogieIcfgContainer [2021-11-23 02:49:04,407 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-23 02:49:04,411 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-23 02:49:04,412 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-23 02:49:04,412 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-23 02:49:04,413 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:03" (3/4) ... [2021-11-23 02:49:04,417 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-23 02:49:04,417 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-23 02:49:04,421 INFO L158 Benchmark]: Toolchain (without parser) took 1696.20ms. Allocated memory was 86.0MB in the beginning and 104.9MB in the end (delta: 18.9MB). Free memory was 49.2MB in the beginning and 74.6MB in the end (delta: -25.4MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:49:04,421 INFO L158 Benchmark]: CDTParser took 0.30ms. Allocated memory is still 86.0MB. Free memory is still 66.2MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:49:04,423 INFO L158 Benchmark]: CACSL2BoogieTranslator took 424.11ms. Allocated memory is still 86.0MB. Free memory was 49.0MB in the beginning and 59.6MB in the end (delta: -10.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-23 02:49:04,424 INFO L158 Benchmark]: Boogie Procedure Inliner took 51.17ms. Allocated memory is still 86.0MB. Free memory was 59.6MB in the beginning and 57.8MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 02:49:04,425 INFO L158 Benchmark]: Boogie Preprocessor took 52.83ms. Allocated memory is still 86.0MB. Free memory was 57.8MB in the beginning and 56.6MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:49:04,432 INFO L158 Benchmark]: RCFGBuilder took 681.33ms. Allocated memory is still 86.0MB. Free memory was 56.2MB in the beginning and 41.1MB in the end (delta: 15.2MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. [2021-11-23 02:49:04,434 INFO L158 Benchmark]: TraceAbstraction took 468.94ms. Allocated memory was 86.0MB in the beginning and 104.9MB in the end (delta: 18.9MB). Free memory was 40.4MB in the beginning and 74.7MB in the end (delta: -34.2MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:49:04,436 INFO L158 Benchmark]: Witness Printer took 5.75ms. Allocated memory is still 104.9MB. Free memory was 74.7MB in the beginning and 74.6MB in the end (delta: 89.6kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:49:04,447 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30ms. Allocated memory is still 86.0MB. Free memory is still 66.2MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 424.11ms. Allocated memory is still 86.0MB. Free memory was 49.0MB in the beginning and 59.6MB in the end (delta: -10.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 51.17ms. Allocated memory is still 86.0MB. Free memory was 59.6MB in the beginning and 57.8MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 52.83ms. Allocated memory is still 86.0MB. Free memory was 57.8MB in the beginning and 56.6MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 681.33ms. Allocated memory is still 86.0MB. Free memory was 56.2MB in the beginning and 41.1MB in the end (delta: 15.2MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. * TraceAbstraction took 468.94ms. Allocated memory was 86.0MB in the beginning and 104.9MB in the end (delta: 18.9MB). Free memory was 40.4MB in the beginning and 74.7MB in the end (delta: -34.2MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 5.75ms. Allocated memory is still 104.9MB. Free memory was 74.7MB in the beginning and 74.6MB in the end (delta: 89.6kB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 48]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of someBinaryFLOATComparisonOperation at line 47, overapproximation of someBinaryArithmeticFLOAToperation at line 45. Possible FailurePath: [L310] COND TRUE __VERIFIER_nondet_int() [L311] CALL main1() [L39] float IN = __VERIFIER_nondet_float(); [L40] CALL assume_abort_if_not(IN >= 0.0f && IN < 1.0f) [L34] COND FALSE !(!cond) [L40] RET assume_abort_if_not(IN >= 0.0f && IN < 1.0f) [L42] float x = IN; [L44-L45] float result = 1.0f + 0.5f*x - 0.125f*x*x + 0.0625f*x*x*x - 0.0390625f*x*x*x*x; VAL [IN=49, x=49] [L47] COND TRUE !(result >= 0.0f && result < 1.5f) VAL [IN=49, x=49] [L48] reach_error() VAL [IN=49, x=49] - UnprovableResult [Line: 61]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 49 locations, 2 error locations. Started 1 CEGAR loops. OverallTime: 0.3s, OverallIterations: 1, TraceHistogramMax: 1, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: , PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=0, InterpolantAutomatonStates: 0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 4 NumberOfCodeBlocks, 4 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-11-23 02:49:04,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/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 32bit --witnessprinter.graph.data.programhash 2e745a133311e60f1a9e202bf4fcb9b524a944d790f4c1df2987f4b8dfd5e08b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:49:07,564 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:49:07,569 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:49:07,651 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:49:07,652 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:49:07,659 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:49:07,662 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:49:07,668 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:49:07,673 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:49:07,685 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:49:07,689 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:49:07,691 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:49:07,693 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:49:07,696 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:49:07,698 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:49:07,701 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:49:07,708 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:49:07,709 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:49:07,713 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:49:07,719 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:49:07,724 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:49:07,726 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:49:07,729 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:49:07,733 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:49:07,741 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:49:07,741 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:49:07,742 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:49:07,744 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:49:07,745 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:49:07,747 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:49:07,747 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:49:07,749 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:49:07,751 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:49:07,753 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:49:07,755 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:49:07,755 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:49:07,757 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:49:07,757 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:49:07,758 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:49:07,760 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:49:07,761 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:49:07,763 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 02:49:07,822 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:49:07,822 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:49:07,823 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:49:07,823 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:49:07,825 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:49:07,825 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:49:07,825 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:49:07,826 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:49:07,827 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:49:07,827 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:49:07,829 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:49:07,829 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:49:07,832 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:49:07,832 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:49:07,832 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:49:07,833 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:49:07,833 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:49:07,833 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:49:07,834 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:49:07,834 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 02:49:07,834 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 02:49:07,834 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 02:49:07,835 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:49:07,835 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:49:07,835 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:49:07,836 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:49:07,836 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:49:07,836 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 02:49:07,837 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:49:07,837 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:49:07,837 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:49:07,838 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:49:07,838 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:49:07,838 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 02:49:07,839 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 02:49:07,839 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:49:07,839 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:49:07,840 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:49:07,840 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e745a133311e60f1a9e202bf4fcb9b524a944d790f4c1df2987f4b8dfd5e08b [2021-11-23 02:49:08,313 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:49:08,369 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:49:08,374 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:49:08,375 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:49:08,376 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:49:08,378 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c [2021-11-23 02:49:08,483 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/data/27997231d/ae56b13928474dc89fd5c6e5e325dc72/FLAG0e7857d27 [2021-11-23 02:49:09,224 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:49:09,225 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c [2021-11-23 02:49:09,243 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/data/27997231d/ae56b13928474dc89fd5c6e5e325dc72/FLAG0e7857d27 [2021-11-23 02:49:09,505 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/data/27997231d/ae56b13928474dc89fd5c6e5e325dc72 [2021-11-23 02:49:09,507 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:49:09,509 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:49:09,511 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:49:09,511 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:49:09,522 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:49:09,524 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:49:09" (1/1) ... [2021-11-23 02:49:09,526 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@394db6d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:09, skipping insertion in model container [2021-11-23 02:49:09,526 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:49:09" (1/1) ... [2021-11-23 02:49:09,535 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:49:09,591 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:49:09,815 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[1995,2008] [2021-11-23 02:49:09,822 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[2389,2402] [2021-11-23 02:49:09,877 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:49:09,929 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:49:09,965 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[1995,2008] [2021-11-23 02:49:09,982 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_2e379fd7-1cdb-4c02-aa19-5ee164b23656/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[2389,2402] [2021-11-23 02:49:10,021 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:49:10,041 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:49:10,042 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10 WrapperNode [2021-11-23 02:49:10,042 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:49:10,044 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:49:10,044 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:49:10,045 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:49:10,054 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (1/1) ... [2021-11-23 02:49:10,071 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (1/1) ... [2021-11-23 02:49:10,099 INFO L137 Inliner]: procedures = 28, calls = 19, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 70 [2021-11-23 02:49:10,100 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:49:10,101 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:49:10,101 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:49:10,101 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:49:10,113 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (1/1) ... [2021-11-23 02:49:10,113 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (1/1) ... [2021-11-23 02:49:10,119 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (1/1) ... [2021-11-23 02:49:10,120 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (1/1) ... [2021-11-23 02:49:10,148 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (1/1) ... [2021-11-23 02:49:10,154 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (1/1) ... [2021-11-23 02:49:10,157 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (1/1) ... [2021-11-23 02:49:10,173 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:49:10,174 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:49:10,174 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:49:10,174 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:49:10,175 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (1/1) ... [2021-11-23 02:49:10,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:49:10,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:10,222 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:49:10,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:49:10,290 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:49:10,290 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 02:49:10,291 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-11-23 02:49:10,291 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-11-23 02:49:10,291 INFO L130 BoogieDeclarations]: Found specification of procedure addflt [2021-11-23 02:49:10,291 INFO L138 BoogieDeclarations]: Found implementation of procedure addflt [2021-11-23 02:49:10,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:49:10,292 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:49:10,292 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 02:49:10,292 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 02:49:10,445 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:49:10,447 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:49:13,031 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:49:13,040 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:49:13,040 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:49:13,043 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:13 BoogieIcfgContainer [2021-11-23 02:49:13,044 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:49:13,046 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:49:13,046 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:49:13,073 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:49:13,073 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:49:09" (1/3) ... [2021-11-23 02:49:13,074 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11808445 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:49:13, skipping insertion in model container [2021-11-23 02:49:13,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:10" (2/3) ... [2021-11-23 02:49:13,075 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11808445 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:49:13, skipping insertion in model container [2021-11-23 02:49:13,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:13" (3/3) ... [2021-11-23 02:49:13,077 INFO L111 eAbstractionObserver]: Analyzing ICFG square_8+soft_float_4-2a.c.cil.c [2021-11-23 02:49:13,084 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:49:13,085 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:49:13,149 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:49:13,158 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 02:49:13,158 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:49:13,180 INFO L276 IsEmpty]: Start isEmpty. Operand has 63 states, 49 states have (on average 1.489795918367347) internal successors, (73), 51 states have internal predecessors, (73), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 02:49:13,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:49:13,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:13,187 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:13,187 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:13,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:13,195 INFO L85 PathProgramCache]: Analyzing trace with hash -548115930, now seen corresponding path program 1 times [2021-11-23 02:49:13,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:49:13,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [156798292] [2021-11-23 02:49:13,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:13,212 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:49:13,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:49:13,220 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:49:13,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 02:49:13,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:13,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 02:49:13,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:13,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:13,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:13,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:13,966 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:49:13,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [156798292] [2021-11-23 02:49:13,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [156798292] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:13,967 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:13,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-23 02:49:13,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019906470] [2021-11-23 02:49:13,971 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:13,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 02:49:13,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:49:14,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 02:49:14,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:49:14,016 INFO L87 Difference]: Start difference. First operand has 63 states, 49 states have (on average 1.489795918367347) internal successors, (73), 51 states have internal predecessors, (73), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:14,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:14,057 INFO L93 Difference]: Finished difference Result 121 states and 178 transitions. [2021-11-23 02:49:14,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 02:49:14,059 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:49:14,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:14,071 INFO L225 Difference]: With dead ends: 121 [2021-11-23 02:49:14,071 INFO L226 Difference]: Without dead ends: 56 [2021-11-23 02:49:14,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:49:14,081 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:14,083 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:49:14,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-23 02:49:14,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-23 02:49:14,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 43 states have (on average 1.3488372093023255) internal successors, (58), 45 states have internal predecessors, (58), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 02:49:14,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 73 transitions. [2021-11-23 02:49:14,138 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 73 transitions. Word has length 7 [2021-11-23 02:49:14,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:14,139 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 73 transitions. [2021-11-23 02:49:14,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:14,139 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 73 transitions. [2021-11-23 02:49:14,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:49:14,140 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:14,140 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:14,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:14,356 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:49:14,357 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:14,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:14,362 INFO L85 PathProgramCache]: Analyzing trace with hash -548056348, now seen corresponding path program 1 times [2021-11-23 02:49:14,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:49:14,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [151819511] [2021-11-23 02:49:14,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:14,370 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:49:14,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:49:14,371 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:49:14,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 02:49:36,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:36,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:49:36,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:51,443 WARN L838 $PredicateComparison]: unable to prove that (and (exists ((|ULTIMATE.start_main1_~IN~0#1| (_ FloatingPoint 8 24))) (let ((.cse0 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (and (fp.geq |ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24)) (fp.lt |ULTIMATE.start_main1_~IN~0#1| .cse0) (= |c_ULTIMATE.start_main1_~result~0#1| (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse0 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)))))) (= c_currentRoundingMode roundNearestTiesToEven)) is different from false [2021-11-23 02:50:42,015 WARN L838 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~IN~0#1| (_ FloatingPoint 8 24))) (let ((.cse1 ((_ to_fp 8 24) roundNearestTiesToEven 1.0))) (and (let ((.cse0 (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven .cse1 (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 2.0)) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 8.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 16.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 5.0 128.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)))) (or (not (fp.lt .cse0 ((_ to_fp 8 24) roundNearestTiesToEven (/ 3.0 2.0)))) (not (fp.geq .cse0 (_ +zero 8 24))))) (fp.geq |ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24)) (fp.lt |ULTIMATE.start_main1_~IN~0#1| .cse1)))) is different from false [2021-11-23 02:50:44,072 WARN L860 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~IN~0#1| (_ FloatingPoint 8 24))) (let ((.cse1 ((_ to_fp 8 24) roundNearestTiesToEven 1.0))) (and (let ((.cse0 (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven .cse1 (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 2.0)) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 8.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 16.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 5.0 128.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)))) (or (not (fp.lt .cse0 ((_ to_fp 8 24) roundNearestTiesToEven (/ 3.0 2.0)))) (not (fp.geq .cse0 (_ +zero 8 24))))) (fp.geq |ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24)) (fp.lt |ULTIMATE.start_main1_~IN~0#1| .cse1)))) is different from true [2021-11-23 02:50:44,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:50:44,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:50:54,791 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode 1.0) (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)))) (and (fp.geq .cse0 (_ +zero 8 24)) (fp.lt .cse0 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0))))) is different from false [2021-11-23 02:50:56,856 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode 1.0) (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)))) (and (fp.geq .cse0 (_ +zero 8 24)) (fp.lt .cse0 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0))))) is different from true [2021-11-23 02:51:11,664 WARN L838 $PredicateComparison]: unable to prove that (or (= |c_ULTIMATE.start_assume_abort_if_not_~cond#1| (_ bv0 32)) (let ((.cse0 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode 1.0) (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)))) (and (fp.geq .cse0 (_ +zero 8 24)) (fp.lt .cse0 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0)))))) is different from false [2021-11-23 02:51:13,744 WARN L860 $PredicateComparison]: unable to prove that (or (= |c_ULTIMATE.start_assume_abort_if_not_~cond#1| (_ bv0 32)) (let ((.cse0 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode 1.0) (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)))) (and (fp.geq .cse0 (_ +zero 8 24)) (fp.lt .cse0 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0)))))) is different from true [2021-11-23 02:51:58,471 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main1_~IN~0#1_4| (_ FloatingPoint 8 24))) (let ((.cse0 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (or (not (fp.lt |v_ULTIMATE.start_main1_~IN~0#1_4| .cse0)) (not (fp.geq |v_ULTIMATE.start_main1_~IN~0#1_4| (_ +zero 8 24))) (let ((.cse1 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse0 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)))) (and (fp.lt .cse1 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0))) (fp.geq .cse1 (_ +zero 8 24))))))) is different from false [2021-11-23 02:52:00,543 WARN L860 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main1_~IN~0#1_4| (_ FloatingPoint 8 24))) (let ((.cse0 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (or (not (fp.lt |v_ULTIMATE.start_main1_~IN~0#1_4| .cse0)) (not (fp.geq |v_ULTIMATE.start_main1_~IN~0#1_4| (_ +zero 8 24))) (let ((.cse1 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse0 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)))) (and (fp.lt .cse1 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0))) (fp.geq .cse1 (_ +zero 8 24))))))) is different from true [2021-11-23 02:52:43,121 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:43,122 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:52:43,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [151819511] [2021-11-23 02:52:43,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [151819511] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:52:43,123 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:52:43,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 10 [2021-11-23 02:52:43,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568179679] [2021-11-23 02:52:43,123 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:52:43,125 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:52:43,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:52:43,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:52:43,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=20, Unknown=9, NotChecked=60, Total=110 [2021-11-23 02:52:43,127 INFO L87 Difference]: Start difference. First operand 56 states and 73 transitions. Second operand has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:45,214 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_main1_~IN~0#1_4| (_ FloatingPoint 8 24))) (let ((.cse0 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (or (not (fp.lt |v_ULTIMATE.start_main1_~IN~0#1_4| .cse0)) (not (fp.geq |v_ULTIMATE.start_main1_~IN~0#1_4| (_ +zero 8 24))) (let ((.cse1 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse0 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)))) (and (fp.lt .cse1 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0))) (fp.geq .cse1 (_ +zero 8 24))))))) (= c_currentRoundingMode roundNearestTiesToEven)) is different from false [2021-11-23 02:52:47,303 WARN L860 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_main1_~IN~0#1_4| (_ FloatingPoint 8 24))) (let ((.cse0 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (or (not (fp.lt |v_ULTIMATE.start_main1_~IN~0#1_4| .cse0)) (not (fp.geq |v_ULTIMATE.start_main1_~IN~0#1_4| (_ +zero 8 24))) (let ((.cse1 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse0 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|) |v_ULTIMATE.start_main1_~IN~0#1_4|)))) (and (fp.lt .cse1 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0))) (fp.geq .cse1 (_ +zero 8 24))))))) (= c_currentRoundingMode roundNearestTiesToEven)) is different from true [2021-11-23 02:52:49,389 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse2 (= |c_ULTIMATE.start_assume_abort_if_not_~cond#1| (_ bv0 32))) (.cse3 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (and (= c_currentRoundingMode roundNearestTiesToEven) (let ((.cse0 (fp.geq |c_ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24))) (.cse1 (fp.lt |c_ULTIMATE.start_main1_~IN~0#1| .cse3))) (or (and .cse0 .cse1 (= |c_ULTIMATE.start_assume_abort_if_not_~cond#1| (_ bv1 32))) (and .cse2 (or (not .cse0) (not .cse1))))) (or .cse2 (let ((.cse4 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse3 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)))) (and (fp.geq .cse4 (_ +zero 8 24)) (fp.lt .cse4 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0)))))))) is different from false [2021-11-23 02:52:51,472 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse2 (= |c_ULTIMATE.start_assume_abort_if_not_~cond#1| (_ bv0 32))) (.cse3 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (and (= c_currentRoundingMode roundNearestTiesToEven) (let ((.cse0 (fp.geq |c_ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24))) (.cse1 (fp.lt |c_ULTIMATE.start_main1_~IN~0#1| .cse3))) (or (and .cse0 .cse1 (= |c_ULTIMATE.start_assume_abort_if_not_~cond#1| (_ bv1 32))) (and .cse2 (or (not .cse0) (not .cse1))))) (or .cse2 (let ((.cse4 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse3 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)))) (and (fp.geq .cse4 (_ +zero 8 24)) (fp.lt .cse4 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0)))))))) is different from true [2021-11-23 02:52:53,551 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse1 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (let ((.cse0 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse1 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)))) (and (fp.geq .cse0 (_ +zero 8 24)) (fp.geq |c_ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24)) (fp.lt |c_ULTIMATE.start_main1_~IN~0#1| .cse1) (fp.lt .cse0 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0))) (= c_currentRoundingMode roundNearestTiesToEven)))) is different from false [2021-11-23 02:52:55,638 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse1 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (let ((.cse0 (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse1 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|) |c_ULTIMATE.start_main1_~IN~0#1|)))) (and (fp.geq .cse0 (_ +zero 8 24)) (fp.geq |c_ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24)) (fp.lt |c_ULTIMATE.start_main1_~IN~0#1| .cse1) (fp.lt .cse0 ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0))) (= c_currentRoundingMode roundNearestTiesToEven)))) is different from true [2021-11-23 02:52:57,721 WARN L838 $PredicateComparison]: unable to prove that (and (fp.geq |c_ULTIMATE.start_main1_~result~0#1| (_ +zero 8 24)) (exists ((|ULTIMATE.start_main1_~IN~0#1| (_ FloatingPoint 8 24))) (let ((.cse0 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (and (fp.geq |ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24)) (fp.lt |ULTIMATE.start_main1_~IN~0#1| .cse0) (= |c_ULTIMATE.start_main1_~result~0#1| (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse0 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)))))) (fp.lt |c_ULTIMATE.start_main1_~result~0#1| ((_ to_fp 8 24) c_currentRoundingMode (/ 3.0 2.0))) (= c_currentRoundingMode roundNearestTiesToEven)) is different from false [2021-11-23 02:52:57,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:57,759 INFO L93 Difference]: Finished difference Result 56 states and 73 transitions. [2021-11-23 02:52:57,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:52:57,759 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:52:57,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:57,761 INFO L225 Difference]: With dead ends: 56 [2021-11-23 02:52:57,762 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 02:52:57,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 9 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=29, Invalid=21, Unknown=16, NotChecked=144, Total=210 [2021-11-23 02:52:57,765 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 0 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 269 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:57,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 261 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 269 Unchecked, 0.0s Time] [2021-11-23 02:52:57,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 02:52:57,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-23 02:52:57,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 39 states have (on average 1.358974358974359) internal successors, (53), 40 states have internal predecessors, (53), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 02:52:57,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 68 transitions. [2021-11-23 02:52:57,779 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 68 transitions. Word has length 7 [2021-11-23 02:52:57,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:57,779 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 68 transitions. [2021-11-23 02:52:57,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:57,780 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 68 transitions. [2021-11-23 02:52:57,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 02:52:57,782 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:57,783 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:52:57,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:58,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:52:58,001 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:52:58,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:58,001 INFO L85 PathProgramCache]: Analyzing trace with hash 1078958274, now seen corresponding path program 1 times [2021-11-23 02:52:58,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:52:58,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1572571114] [2021-11-23 02:52:58,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:58,003 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:52:58,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:52:58,005 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:52:58,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 02:52:58,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:58,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:52:58,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:58,557 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:52:58,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:52:58,891 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:52:58,892 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:52:58,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1572571114] [2021-11-23 02:52:58,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1572571114] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:52:58,893 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:52:58,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [] total 8 [2021-11-23 02:52:58,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603285799] [2021-11-23 02:52:58,893 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:52:58,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:52:58,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:52:58,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:52:58,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:52:58,896 INFO L87 Difference]: Start difference. First operand 51 states and 68 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:52:59,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:59,289 INFO L93 Difference]: Finished difference Result 100 states and 135 transitions. [2021-11-23 02:52:59,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:52:59,291 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 32 [2021-11-23 02:52:59,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:59,295 INFO L225 Difference]: With dead ends: 100 [2021-11-23 02:52:59,295 INFO L226 Difference]: Without dead ends: 72 [2021-11-23 02:52:59,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:52:59,298 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 20 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:59,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 438 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:52:59,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-23 02:52:59,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2021-11-23 02:52:59,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 47 states have (on average 1.297872340425532) internal successors, (61), 49 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (11), 8 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-23 02:52:59,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 81 transitions. [2021-11-23 02:52:59,321 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 81 transitions. Word has length 32 [2021-11-23 02:52:59,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:59,322 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 81 transitions. [2021-11-23 02:52:59,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:52:59,323 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 81 transitions. [2021-11-23 02:52:59,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 02:52:59,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:59,326 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-23 02:52:59,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:59,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:52:59,541 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:52:59,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:59,541 INFO L85 PathProgramCache]: Analyzing trace with hash 452521591, now seen corresponding path program 1 times [2021-11-23 02:52:59,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:52:59,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1708535821] [2021-11-23 02:52:59,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:59,542 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:52:59,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:52:59,543 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:52:59,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 02:52:59,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:59,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:52:59,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:00,104 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:53:00,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:00,436 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:53:00,436 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:00,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1708535821] [2021-11-23 02:53:00,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1708535821] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:00,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [168326942] [2021-11-23 02:53:00,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:00,438 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:00,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:53:00,444 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:53:00,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-23 02:53:00,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:00,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:53:00,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:00,714 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:53:00,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:01,040 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:53:01,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [168326942] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:01,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396865081] [2021-11-23 02:53:01,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:01,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:01,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:53:01,048 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:53:01,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:53:01,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:01,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:53:01,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:01,312 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:53:01,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:01,637 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:53:01,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396865081] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:01,638 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:53:01,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 9 [2021-11-23 02:53:01,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963644003] [2021-11-23 02:53:01,639 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:53:01,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:53:01,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:01,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:53:01,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:53:01,642 INFO L87 Difference]: Start difference. First operand 62 states and 81 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 02:53:02,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:02,283 INFO L93 Difference]: Finished difference Result 122 states and 160 transitions. [2021-11-23 02:53:02,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:53:02,288 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 36 [2021-11-23 02:53:02,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:02,290 INFO L225 Difference]: With dead ends: 122 [2021-11-23 02:53:02,291 INFO L226 Difference]: Without dead ends: 94 [2021-11-23 02:53:02,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:53:02,293 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 26 mSDsluCounter, 443 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:02,294 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 508 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:53:02,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-23 02:53:02,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 72. [2021-11-23 02:53:02,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 54 states have (on average 1.2777777777777777) internal successors, (69), 56 states have internal predecessors, (69), 11 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-23 02:53:02,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 94 transitions. [2021-11-23 02:53:02,323 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 94 transitions. Word has length 36 [2021-11-23 02:53:02,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:02,324 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 94 transitions. [2021-11-23 02:53:02,325 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 02:53:02,325 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 94 transitions. [2021-11-23 02:53:02,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 02:53:02,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:02,337 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 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] [2021-11-23 02:53:02,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:02,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:02,755 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (6)] Ended with exit code 0 [2021-11-23 02:53:02,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:02,954 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:02,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:02,955 INFO L85 PathProgramCache]: Analyzing trace with hash 1328087799, now seen corresponding path program 1 times [2021-11-23 02:53:02,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:02,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [580629967] [2021-11-23 02:53:02,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:02,956 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:02,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:02,958 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:02,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 02:53:03,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:03,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:53:03,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:03,488 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:53:03,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:03,825 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:53:03,825 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:03,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [580629967] [2021-11-23 02:53:03,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [580629967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:03,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1162070688] [2021-11-23 02:53:03,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:03,826 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:03,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:53:03,832 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:53:03,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-23 02:53:03,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:03,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:53:03,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:04,484 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:53:04,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:04,828 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:53:04,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1162070688] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:53:04,829 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:53:04,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [8, 8] total 12 [2021-11-23 02:53:04,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769962590] [2021-11-23 02:53:04,830 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:53:04,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:53:04,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:04,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:53:04,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:53:04,833 INFO L87 Difference]: Start difference. First operand 72 states and 94 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 02:53:05,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:05,476 INFO L93 Difference]: Finished difference Result 115 states and 149 transitions. [2021-11-23 02:53:05,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:53:05,477 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 40 [2021-11-23 02:53:05,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:05,480 INFO L225 Difference]: With dead ends: 115 [2021-11-23 02:53:05,480 INFO L226 Difference]: Without dead ends: 92 [2021-11-23 02:53:05,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:53:05,483 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 19 mSDsluCounter, 461 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 531 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:05,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 531 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:53:05,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-23 02:53:05,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 80. [2021-11-23 02:53:05,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 62 states have internal predecessors, (76), 12 states have call successors, (12), 6 states have call predecessors, (12), 7 states have return successors, (15), 11 states have call predecessors, (15), 11 states have call successors, (15) [2021-11-23 02:53:05,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 103 transitions. [2021-11-23 02:53:05,499 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 103 transitions. Word has length 40 [2021-11-23 02:53:05,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:05,500 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 103 transitions. [2021-11-23 02:53:05,501 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 02:53:05,501 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 103 transitions. [2021-11-23 02:53:05,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 02:53:05,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:05,504 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:05,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:05,709 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2021-11-23 02:53:05,909 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:05,909 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:05,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:05,910 INFO L85 PathProgramCache]: Analyzing trace with hash 78255138, now seen corresponding path program 2 times [2021-11-23 02:53:05,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:05,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1222883689] [2021-11-23 02:53:05,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:53:05,911 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:05,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:05,912 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:05,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 02:53:05,967 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-23 02:53:05,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:53:05,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:53:05,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:06,534 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:53:06,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:06,978 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:53:06,979 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:06,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1222883689] [2021-11-23 02:53:06,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1222883689] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:53:06,980 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:53:06,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 10 [2021-11-23 02:53:06,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461652595] [2021-11-23 02:53:06,980 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:53:06,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:53:06,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:06,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:53:06,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:53:06,983 INFO L87 Difference]: Start difference. First operand 80 states and 103 transitions. Second operand has 10 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:53:07,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:07,716 INFO L93 Difference]: Finished difference Result 115 states and 147 transitions. [2021-11-23 02:53:07,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:53:07,718 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 40 [2021-11-23 02:53:07,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:07,721 INFO L225 Difference]: With dead ends: 115 [2021-11-23 02:53:07,721 INFO L226 Difference]: Without dead ends: 113 [2021-11-23 02:53:07,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:53:07,723 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 38 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:07,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 468 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 74 Invalid, 0 Unknown, 8 Unchecked, 0.4s Time] [2021-11-23 02:53:07,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-23 02:53:07,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 84. [2021-11-23 02:53:07,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 63 states have (on average 1.253968253968254) internal successors, (79), 65 states have internal predecessors, (79), 12 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (15), 11 states have call predecessors, (15), 11 states have call successors, (15) [2021-11-23 02:53:07,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 106 transitions. [2021-11-23 02:53:07,742 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 106 transitions. Word has length 40 [2021-11-23 02:53:07,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:07,743 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 106 transitions. [2021-11-23 02:53:07,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:53:07,743 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 106 transitions. [2021-11-23 02:53:07,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 02:53:07,746 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:07,747 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:07,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:07,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:53:07,957 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:07,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:07,957 INFO L85 PathProgramCache]: Analyzing trace with hash 463941786, now seen corresponding path program 1 times [2021-11-23 02:53:07,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:07,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1217023876] [2021-11-23 02:53:07,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:07,958 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:07,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:07,959 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:07,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 02:53:08,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:08,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:53:08,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:08,487 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:08,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:08,987 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:08,987 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:08,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1217023876] [2021-11-23 02:53:08,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1217023876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:08,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1862915817] [2021-11-23 02:53:08,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:08,988 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:08,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:53:08,989 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:53:09,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 02:53:09,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:09,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:53:09,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:09,299 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:09,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:09,748 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:09,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1862915817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:09,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613442376] [2021-11-23 02:53:09,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:09,749 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:09,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:53:09,750 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:53:09,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:53:09,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:09,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:53:09,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:10,022 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:10,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:10,472 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:10,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613442376] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:10,473 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:53:10,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 9 [2021-11-23 02:53:10,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693308547] [2021-11-23 02:53:10,473 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:53:10,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:53:10,474 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:10,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:53:10,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:53:10,475 INFO L87 Difference]: Start difference. First operand 84 states and 106 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:53:11,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:11,132 INFO L93 Difference]: Finished difference Result 130 states and 169 transitions. [2021-11-23 02:53:11,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:53:11,133 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 45 [2021-11-23 02:53:11,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:11,135 INFO L225 Difference]: With dead ends: 130 [2021-11-23 02:53:11,135 INFO L226 Difference]: Without dead ends: 119 [2021-11-23 02:53:11,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 258 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:53:11,137 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 53 mSDsluCounter, 376 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:11,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 457 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:53:11,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-23 02:53:11,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 98. [2021-11-23 02:53:11,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 72 states have (on average 1.2361111111111112) internal successors, (89), 76 states have internal predecessors, (89), 15 states have call successors, (15), 7 states have call predecessors, (15), 10 states have return successors, (21), 14 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-23 02:53:11,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 125 transitions. [2021-11-23 02:53:11,160 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 125 transitions. Word has length 45 [2021-11-23 02:53:11,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:11,160 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 125 transitions. [2021-11-23 02:53:11,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:53:11,161 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 125 transitions. [2021-11-23 02:53:11,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 02:53:11,164 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:11,164 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:11,172 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (12)] Ended with exit code 0 [2021-11-23 02:53:11,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:11,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:11,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:53:11,766 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:11,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:11,767 INFO L85 PathProgramCache]: Analyzing trace with hash 1165006364, now seen corresponding path program 1 times [2021-11-23 02:53:11,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:11,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1606468944] [2021-11-23 02:53:11,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:11,767 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:11,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:11,768 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:11,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 02:53:11,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:11,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:53:11,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:12,417 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:12,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:13,306 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:13,306 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:13,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1606468944] [2021-11-23 02:53:13,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1606468944] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:53:13,306 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:53:13,306 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11, 11] imperfect sequences [] total 14 [2021-11-23 02:53:13,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188900081] [2021-11-23 02:53:13,306 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:53:13,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 02:53:13,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:13,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 02:53:13,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:53:13,310 INFO L87 Difference]: Start difference. First operand 98 states and 125 transitions. Second operand has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 3 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-23 02:53:14,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:14,561 INFO L93 Difference]: Finished difference Result 134 states and 171 transitions. [2021-11-23 02:53:14,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:53:14,562 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 3 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) Word has length 45 [2021-11-23 02:53:14,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:14,564 INFO L225 Difference]: With dead ends: 134 [2021-11-23 02:53:14,564 INFO L226 Difference]: Without dead ends: 127 [2021-11-23 02:53:14,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:53:14,566 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 50 mSDsluCounter, 580 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 641 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:14,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 641 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:53:14,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-23 02:53:14,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 100. [2021-11-23 02:53:14,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 74 states have (on average 1.2297297297297298) internal successors, (91), 77 states have internal predecessors, (91), 15 states have call successors, (15), 7 states have call predecessors, (15), 10 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-23 02:53:14,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 127 transitions. [2021-11-23 02:53:14,585 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 127 transitions. Word has length 45 [2021-11-23 02:53:14,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:14,586 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 127 transitions. [2021-11-23 02:53:14,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 3 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-23 02:53:14,586 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 127 transitions. [2021-11-23 02:53:14,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 02:53:14,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:14,589 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:14,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:14,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:53:14,802 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:14,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:14,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1862719454, now seen corresponding path program 1 times [2021-11-23 02:53:14,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:14,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1527287101] [2021-11-23 02:53:14,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:14,803 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:14,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:14,804 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:14,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 02:53:14,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:14,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:53:14,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:15,480 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:15,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:16,384 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:16,384 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:16,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1527287101] [2021-11-23 02:53:16,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1527287101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:16,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1695345092] [2021-11-23 02:53:16,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:16,386 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:16,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:53:16,387 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:53:16,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 02:53:16,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:16,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:53:16,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:17,074 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:17,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:18,129 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:18,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1695345092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:18,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169429563] [2021-11-23 02:53:18,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:18,130 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:18,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:53:18,131 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:53:18,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:53:18,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:18,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:53:18,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:18,442 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:18,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:18,999 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:53:18,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169429563] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:18,999 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:53:18,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10, 10, 11, 11] total 21 [2021-11-23 02:53:19,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256184109] [2021-11-23 02:53:19,000 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:53:19,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-23 02:53:19,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:19,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-23 02:53:19,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=372, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:53:19,002 INFO L87 Difference]: Start difference. First operand 100 states and 127 transitions. Second operand has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 17 states have internal predecessors, (48), 6 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (12), 7 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-23 02:53:21,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:21,942 INFO L93 Difference]: Finished difference Result 178 states and 230 transitions. [2021-11-23 02:53:21,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:53:21,943 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 17 states have internal predecessors, (48), 6 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (12), 7 states have call predecessors, (12), 5 states have call successors, (12) Word has length 47 [2021-11-23 02:53:21,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:21,946 INFO L225 Difference]: With dead ends: 178 [2021-11-23 02:53:21,946 INFO L226 Difference]: Without dead ends: 149 [2021-11-23 02:53:21,947 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 258 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:53:21,948 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 91 mSDsluCounter, 1119 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 1194 SdHoareTripleChecker+Invalid, 466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:21,948 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 1194 Invalid, 466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-23 02:53:21,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-23 02:53:21,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 124. [2021-11-23 02:53:21,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 93 states have (on average 1.2043010752688172) internal successors, (112), 95 states have internal predecessors, (112), 18 states have call successors, (18), 9 states have call predecessors, (18), 12 states have return successors, (29), 19 states have call predecessors, (29), 17 states have call successors, (29) [2021-11-23 02:53:21,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 159 transitions. [2021-11-23 02:53:21,966 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 159 transitions. Word has length 47 [2021-11-23 02:53:21,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:21,967 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 159 transitions. [2021-11-23 02:53:21,967 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 17 states have internal predecessors, (48), 6 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (12), 7 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-23 02:53:21,968 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 159 transitions. [2021-11-23 02:53:21,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 02:53:21,970 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:21,970 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:22,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:22,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:22,396 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-11-23 02:53:22,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:53:22,589 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:22,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:22,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1805461152, now seen corresponding path program 1 times [2021-11-23 02:53:22,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:22,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [949267323] [2021-11-23 02:53:22,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:22,590 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:22,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:22,591 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:22,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 02:53:22,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:22,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:53:22,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:22,880 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:53:22,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:23,116 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:53:23,117 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:23,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [949267323] [2021-11-23 02:53:23,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [949267323] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:53:23,117 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:53:23,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 8 [2021-11-23 02:53:23,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096501604] [2021-11-23 02:53:23,118 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:53:23,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:53:23,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:23,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:53:23,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:53:23,119 INFO L87 Difference]: Start difference. First operand 124 states and 159 transitions. Second operand has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-23 02:53:23,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:23,324 INFO L93 Difference]: Finished difference Result 132 states and 166 transitions. [2021-11-23 02:53:23,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:53:23,333 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 47 [2021-11-23 02:53:23,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:23,335 INFO L225 Difference]: With dead ends: 132 [2021-11-23 02:53:23,335 INFO L226 Difference]: Without dead ends: 111 [2021-11-23 02:53:23,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:53:23,337 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 9 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:23,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 380 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:53:23,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-23 02:53:23,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-11-23 02:53:23,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 83 states have (on average 1.1927710843373494) internal successors, (99), 86 states have internal predecessors, (99), 16 states have call successors, (16), 8 states have call predecessors, (16), 11 states have return successors, (25), 16 states have call predecessors, (25), 15 states have call successors, (25) [2021-11-23 02:53:23,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 140 transitions. [2021-11-23 02:53:23,353 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 140 transitions. Word has length 47 [2021-11-23 02:53:23,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:23,354 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 140 transitions. [2021-11-23 02:53:23,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-23 02:53:23,354 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 140 transitions. [2021-11-23 02:53:23,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:53:23,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:23,356 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:23,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:23,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:53:23,572 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:23,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:23,573 INFO L85 PathProgramCache]: Analyzing trace with hash 2144611077, now seen corresponding path program 1 times [2021-11-23 02:53:23,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:23,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2062775756] [2021-11-23 02:53:23,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:23,573 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:23,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:23,574 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:23,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 02:53:23,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:23,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:53:23,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:24,395 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:24,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:26,409 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:26,409 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:26,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2062775756] [2021-11-23 02:53:26,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2062775756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:26,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [872027119] [2021-11-23 02:53:26,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:26,410 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:26,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:53:26,411 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:53:26,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 02:53:26,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:26,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:53:26,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:26,675 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:26,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:27,219 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:27,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [872027119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:27,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353843697] [2021-11-23 02:53:27,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:27,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:27,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:53:27,221 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:53:27,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:53:27,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:27,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:53:27,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:27,471 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:27,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:28,032 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:28,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353843697] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:28,033 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:53:28,033 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 24 [2021-11-23 02:53:28,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654577544] [2021-11-23 02:53:28,034 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:53:28,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 02:53:28,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:28,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 02:53:28,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:53:28,036 INFO L87 Difference]: Start difference. First operand 111 states and 140 transitions. Second operand has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:53:32,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:32,437 INFO L93 Difference]: Finished difference Result 157 states and 214 transitions. [2021-11-23 02:53:32,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 02:53:32,438 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) Word has length 49 [2021-11-23 02:53:32,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:32,440 INFO L225 Difference]: With dead ends: 157 [2021-11-23 02:53:32,440 INFO L226 Difference]: Without dead ends: 123 [2021-11-23 02:53:32,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 266 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=199, Invalid=1361, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:53:32,442 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 120 mSDsluCounter, 1075 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 1147 SdHoareTripleChecker+Invalid, 537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:32,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 1147 Invalid, 537 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:53:32,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-23 02:53:32,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 100. [2021-11-23 02:53:32,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 74 states have (on average 1.2027027027027026) internal successors, (89), 79 states have internal predecessors, (89), 14 states have call successors, (14), 6 states have call predecessors, (14), 11 states have return successors, (32), 14 states have call predecessors, (32), 13 states have call successors, (32) [2021-11-23 02:53:32,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 135 transitions. [2021-11-23 02:53:32,459 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 135 transitions. Word has length 49 [2021-11-23 02:53:32,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:32,460 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 135 transitions. [2021-11-23 02:53:32,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:53:32,460 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 135 transitions. [2021-11-23 02:53:32,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:53:32,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:32,462 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:32,469 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (20)] Ended with exit code 0 [2021-11-23 02:53:32,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:32,872 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2021-11-23 02:53:33,064 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:53:33,064 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:33,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:33,065 INFO L85 PathProgramCache]: Analyzing trace with hash 1400781647, now seen corresponding path program 2 times [2021-11-23 02:53:33,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:33,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1307946800] [2021-11-23 02:53:33,065 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:53:33,065 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:33,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:33,066 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:33,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 02:53:33,118 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:53:33,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:53:33,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:53:33,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:33,871 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:33,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:35,724 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:35,724 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:35,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1307946800] [2021-11-23 02:53:35,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1307946800] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:35,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [344663858] [2021-11-23 02:53:35,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:53:35,725 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:35,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:53:35,726 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:53:35,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-23 02:53:35,798 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:53:35,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:53:35,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:53:35,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:36,037 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:36,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:36,603 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:36,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [344663858] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:36,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132297872] [2021-11-23 02:53:36,603 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:53:36,603 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:36,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:53:36,604 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:53:36,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 02:53:36,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:53:36,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:53:36,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:53:36,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:36,838 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:36,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:37,375 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:53:37,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132297872] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:37,375 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:53:37,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 24 [2021-11-23 02:53:37,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646953721] [2021-11-23 02:53:37,376 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:53:37,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 02:53:37,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:37,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 02:53:37,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:53:37,378 INFO L87 Difference]: Start difference. First operand 100 states and 135 transitions. Second operand has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:53:41,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:41,385 INFO L93 Difference]: Finished difference Result 138 states and 187 transitions. [2021-11-23 02:53:41,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 02:53:41,386 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) Word has length 49 [2021-11-23 02:53:41,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:41,388 INFO L225 Difference]: With dead ends: 138 [2021-11-23 02:53:41,389 INFO L226 Difference]: Without dead ends: 111 [2021-11-23 02:53:41,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 266 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=184, Invalid=1298, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 02:53:41,391 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 158 mSDsluCounter, 1008 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 1080 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:41,391 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 1080 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 02:53:41,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-23 02:53:41,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 84. [2021-11-23 02:53:41,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 67 states have internal predecessors, (77), 12 states have call successors, (12), 4 states have call predecessors, (12), 9 states have return successors, (28), 12 states have call predecessors, (28), 11 states have call successors, (28) [2021-11-23 02:53:41,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 117 transitions. [2021-11-23 02:53:41,413 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 117 transitions. Word has length 49 [2021-11-23 02:53:41,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:41,414 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 117 transitions. [2021-11-23 02:53:41,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:53:41,414 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 117 transitions. [2021-11-23 02:53:41,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:53:41,416 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:41,416 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:41,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:41,626 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (22)] Ended with exit code 0 [2021-11-23 02:53:41,838 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-23 02:53:42,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:42,018 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:42,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:42,019 INFO L85 PathProgramCache]: Analyzing trace with hash -1227181886, now seen corresponding path program 1 times [2021-11-23 02:53:42,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:42,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [196831955] [2021-11-23 02:53:42,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:42,019 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:42,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:42,020 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:42,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 02:53:42,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:42,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:53:42,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:46,979 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:53:46,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:47,921 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:53:47,921 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:47,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [196831955] [2021-11-23 02:53:47,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [196831955] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:53:47,922 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:53:47,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [] total 14 [2021-11-23 02:53:47,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361625488] [2021-11-23 02:53:47,922 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:53:47,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 02:53:47,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:47,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 02:53:47,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=135, Unknown=1, NotChecked=0, Total=182 [2021-11-23 02:53:47,923 INFO L87 Difference]: Start difference. First operand 84 states and 117 transitions. Second operand has 14 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-23 02:53:48,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:48,066 INFO L93 Difference]: Finished difference Result 91 states and 124 transitions. [2021-11-23 02:53:48,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:53:48,066 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 50 [2021-11-23 02:53:48,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:48,067 INFO L225 Difference]: With dead ends: 91 [2021-11-23 02:53:48,068 INFO L226 Difference]: Without dead ends: 89 [2021-11-23 02:53:48,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=52, Invalid=157, Unknown=1, NotChecked=0, Total=210 [2021-11-23 02:53:48,069 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 8 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:48,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 462 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 14 Unchecked, 0.1s Time] [2021-11-23 02:53:48,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-23 02:53:48,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-23 02:53:48,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 65 states have (on average 1.2307692307692308) internal successors, (80), 71 states have internal predecessors, (80), 13 states have call successors, (13), 5 states have call predecessors, (13), 10 states have return successors, (29), 12 states have call predecessors, (29), 12 states have call successors, (29) [2021-11-23 02:53:48,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 122 transitions. [2021-11-23 02:53:48,082 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 122 transitions. Word has length 50 [2021-11-23 02:53:48,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:48,083 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 122 transitions. [2021-11-23 02:53:48,083 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-23 02:53:48,083 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 122 transitions. [2021-11-23 02:53:48,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 02:53:48,085 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:48,085 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:48,102 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (25)] Ended with exit code 0 [2021-11-23 02:53:48,300 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:53:48,300 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:48,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:48,300 INFO L85 PathProgramCache]: Analyzing trace with hash 381005423, now seen corresponding path program 1 times [2021-11-23 02:53:48,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:48,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [376878402] [2021-11-23 02:53:48,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:48,301 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:48,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:48,302 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:48,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 02:53:48,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:48,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:53:48,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:54,061 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:53:54,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:54,706 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:53:54,706 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:54,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [376878402] [2021-11-23 02:53:54,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [376878402] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:53:54,707 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:53:54,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [] total 14 [2021-11-23 02:53:54,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661267847] [2021-11-23 02:53:54,707 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:53:54,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 02:53:54,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:54,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 02:53:54,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=136, Unknown=2, NotChecked=0, Total=182 [2021-11-23 02:53:54,709 INFO L87 Difference]: Start difference. First operand 89 states and 122 transitions. Second operand has 14 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-23 02:53:54,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:54,812 INFO L93 Difference]: Finished difference Result 95 states and 127 transitions. [2021-11-23 02:53:54,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:53:54,813 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 51 [2021-11-23 02:53:54,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:54,814 INFO L225 Difference]: With dead ends: 95 [2021-11-23 02:53:54,814 INFO L226 Difference]: Without dead ends: 91 [2021-11-23 02:53:54,815 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=50, Invalid=158, Unknown=2, NotChecked=0, Total=210 [2021-11-23 02:53:54,815 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 16 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:54,816 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 377 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 8 Invalid, 0 Unknown, 16 Unchecked, 0.0s Time] [2021-11-23 02:53:54,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-23 02:53:54,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2021-11-23 02:53:54,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 64 states have (on average 1.21875) internal successors, (78), 68 states have internal predecessors, (78), 12 states have call successors, (12), 5 states have call predecessors, (12), 9 states have return successors, (28), 12 states have call predecessors, (28), 11 states have call successors, (28) [2021-11-23 02:53:54,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 118 transitions. [2021-11-23 02:53:54,827 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 118 transitions. Word has length 51 [2021-11-23 02:53:54,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:54,828 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 118 transitions. [2021-11-23 02:53:54,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-23 02:53:54,829 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 118 transitions. [2021-11-23 02:53:54,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 02:53:54,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:54,830 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:54,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:55,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:53:55,046 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:55,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:55,047 INFO L85 PathProgramCache]: Analyzing trace with hash 57968830, now seen corresponding path program 1 times [2021-11-23 02:53:55,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:55,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1963017943] [2021-11-23 02:53:55,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:55,048 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:55,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:55,049 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:55,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 02:53:55,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:55,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:53:55,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:55,538 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:53:55,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:56,224 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:53:56,224 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:56,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1963017943] [2021-11-23 02:53:56,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1963017943] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:56,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1248439597] [2021-11-23 02:53:56,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:56,225 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:56,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:53:56,229 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:53:56,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 02:53:56,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:56,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:53:56,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:56,759 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:53:56,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:57,701 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:53:57,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1248439597] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:53:57,701 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:53:57,702 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 7] imperfect sequences [8, 8] total 18 [2021-11-23 02:53:57,702 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753233807] [2021-11-23 02:53:57,702 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:53:57,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:53:57,703 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:53:57,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:53:57,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:53:57,704 INFO L87 Difference]: Start difference. First operand 86 states and 118 transitions. Second operand has 9 states, 9 states have (on average 4.0) internal successors, (36), 9 states have internal predecessors, (36), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:53:58,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:58,001 INFO L93 Difference]: Finished difference Result 118 states and 176 transitions. [2021-11-23 02:53:58,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:53:58,002 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.0) internal successors, (36), 9 states have internal predecessors, (36), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 55 [2021-11-23 02:53:58,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:58,004 INFO L225 Difference]: With dead ends: 118 [2021-11-23 02:53:58,004 INFO L226 Difference]: Without dead ends: 107 [2021-11-23 02:53:58,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:53:58,006 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 90 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:58,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 234 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:53:58,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-23 02:53:58,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 100. [2021-11-23 02:53:58,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 73 states have (on average 1.2191780821917808) internal successors, (89), 79 states have internal predecessors, (89), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (44), 15 states have call predecessors, (44), 14 states have call successors, (44) [2021-11-23 02:53:58,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 148 transitions. [2021-11-23 02:53:58,020 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 148 transitions. Word has length 55 [2021-11-23 02:53:58,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:58,021 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 148 transitions. [2021-11-23 02:53:58,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.0) internal successors, (36), 9 states have internal predecessors, (36), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:53:58,021 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 148 transitions. [2021-11-23 02:53:58,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 02:53:58,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:58,024 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:58,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:58,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:58,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:58,439 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:53:58,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:58,439 INFO L85 PathProgramCache]: Analyzing trace with hash -571789227, now seen corresponding path program 1 times [2021-11-23 02:53:58,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:53:58,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1000886233] [2021-11-23 02:53:58,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:58,440 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:53:58,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:53:58,441 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:53:58,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 02:53:58,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:58,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:53:58,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:58,988 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:53:58,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:59,746 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:53:59,746 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:53:59,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1000886233] [2021-11-23 02:53:59,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1000886233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:59,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1932632357] [2021-11-23 02:53:59,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:59,747 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:53:59,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:53:59,754 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:53:59,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 02:53:59,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:59,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:53:59,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:00,097 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:00,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:00,761 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:00,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1932632357] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:00,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078055351] [2021-11-23 02:54:00,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:00,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:00,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:54:00,762 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:54:00,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 02:54:00,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:00,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:54:00,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:01,044 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:01,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:01,602 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:01,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078055351] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:01,603 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:54:01,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-23 02:54:01,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763689009] [2021-11-23 02:54:01,603 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:01,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:54:01,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:54:01,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:54:01,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:54:01,604 INFO L87 Difference]: Start difference. First operand 100 states and 148 transitions. Second operand has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 02:54:02,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:54:02,297 INFO L93 Difference]: Finished difference Result 114 states and 166 transitions. [2021-11-23 02:54:02,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:54:02,298 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 64 [2021-11-23 02:54:02,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:54:02,299 INFO L225 Difference]: With dead ends: 114 [2021-11-23 02:54:02,300 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 02:54:02,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:54:02,301 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 128 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:54:02,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 395 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:54:02,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 02:54:02,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-23 02:54:02,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 75 states have (on average 1.2133333333333334) internal successors, (91), 82 states have internal predecessors, (91), 15 states have call successors, (15), 5 states have call predecessors, (15), 12 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) [2021-11-23 02:54:02,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 152 transitions. [2021-11-23 02:54:02,317 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 152 transitions. Word has length 64 [2021-11-23 02:54:02,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:54:02,317 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 152 transitions. [2021-11-23 02:54:02,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 02:54:02,318 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 152 transitions. [2021-11-23 02:54:02,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 02:54:02,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:54:02,320 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:54:02,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:02,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:02,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:02,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:02,935 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:54:02,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:54:02,935 INFO L85 PathProgramCache]: Analyzing trace with hash -768011691, now seen corresponding path program 2 times [2021-11-23 02:54:02,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:54:02,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [31348641] [2021-11-23 02:54:02,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:54:02,936 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:54:02,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:54:02,937 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:54:02,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 02:54:02,993 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:54:02,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:54:02,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:54:02,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:03,429 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:03,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:04,242 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:04,242 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:54:04,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [31348641] [2021-11-23 02:54:04,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [31348641] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:04,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1211008094] [2021-11-23 02:54:04,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:54:04,243 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:54:04,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:54:04,248 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:54:04,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 02:54:04,357 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:54:04,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:54:04,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:54:04,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:04,614 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:04,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:05,163 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:05,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1211008094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:05,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965819855] [2021-11-23 02:54:05,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:54:05,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:05,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:54:05,166 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:54:05,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 02:54:05,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:54:05,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:54:05,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:54:05,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:05,483 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:05,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:06,022 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:06,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965819855] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:06,022 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:54:06,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-23 02:54:06,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978504499] [2021-11-23 02:54:06,023 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:06,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:54:06,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:54:06,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:54:06,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:54:06,025 INFO L87 Difference]: Start difference. First operand 103 states and 152 transitions. Second operand has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 02:54:06,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:54:06,880 INFO L93 Difference]: Finished difference Result 116 states and 170 transitions. [2021-11-23 02:54:06,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:54:06,881 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 64 [2021-11-23 02:54:06,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:54:06,883 INFO L225 Difference]: With dead ends: 116 [2021-11-23 02:54:06,883 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 02:54:06,884 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:54:06,885 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 125 mSDsluCounter, 379 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:54:06,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 459 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:54:06,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 02:54:06,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-23 02:54:06,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 75 states have (on average 1.2133333333333334) internal successors, (91), 82 states have internal predecessors, (91), 15 states have call successors, (15), 5 states have call predecessors, (15), 12 states have return successors, (45), 15 states have call predecessors, (45), 14 states have call successors, (45) [2021-11-23 02:54:06,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 151 transitions. [2021-11-23 02:54:06,906 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 151 transitions. Word has length 64 [2021-11-23 02:54:06,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:54:06,907 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 151 transitions. [2021-11-23 02:54:06,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 02:54:06,907 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 151 transitions. [2021-11-23 02:54:06,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:54:06,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:54:06,910 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:54:06,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:07,120 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-11-23 02:54:07,335 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-11-23 02:54:07,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:07,512 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:54:07,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:54:07,512 INFO L85 PathProgramCache]: Analyzing trace with hash 336770129, now seen corresponding path program 1 times [2021-11-23 02:54:07,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:54:07,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [315641445] [2021-11-23 02:54:07,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:07,513 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:54:07,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:54:07,514 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:54:07,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 02:54:07,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:07,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:54:07,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:08,034 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:08,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:08,821 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:08,821 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:54:08,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [315641445] [2021-11-23 02:54:08,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [315641445] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:08,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [497688141] [2021-11-23 02:54:08,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:08,822 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:54:08,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:54:08,825 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:54:08,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-23 02:54:08,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:08,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:54:08,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:09,159 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:09,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:09,715 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:09,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [497688141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:09,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590420455] [2021-11-23 02:54:09,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:09,716 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:09,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:54:09,717 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:54:09,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 02:54:09,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:09,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:54:09,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:10,039 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:10,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:10,592 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:10,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590420455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:10,592 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:54:10,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-23 02:54:10,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507844188] [2021-11-23 02:54:10,592 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:10,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:54:10,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:54:10,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:54:10,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:54:10,594 INFO L87 Difference]: Start difference. First operand 103 states and 151 transitions. Second operand has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 02:54:11,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:54:11,344 INFO L93 Difference]: Finished difference Result 114 states and 162 transitions. [2021-11-23 02:54:11,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:54:11,345 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 66 [2021-11-23 02:54:11,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:54:11,346 INFO L225 Difference]: With dead ends: 114 [2021-11-23 02:54:11,347 INFO L226 Difference]: Without dead ends: 100 [2021-11-23 02:54:11,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 381 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:54:11,348 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 115 mSDsluCounter, 421 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:54:11,349 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 501 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:54:11,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-23 02:54:11,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-11-23 02:54:11,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 73 states have (on average 1.2054794520547945) internal successors, (88), 79 states have internal predecessors, (88), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (41), 15 states have call predecessors, (41), 14 states have call successors, (41) [2021-11-23 02:54:11,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 144 transitions. [2021-11-23 02:54:11,362 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 144 transitions. Word has length 66 [2021-11-23 02:54:11,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:54:11,363 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 144 transitions. [2021-11-23 02:54:11,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 02:54:11,363 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 144 transitions. [2021-11-23 02:54:11,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:54:11,373 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:54:11,373 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:54:11,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:11,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:11,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:11,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:54:11,975 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:54:11,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:54:11,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1198335757, now seen corresponding path program 2 times [2021-11-23 02:54:11,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:54:11,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1403298271] [2021-11-23 02:54:11,976 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:54:11,976 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:54:11,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:54:11,978 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:54:12,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 02:54:12,056 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:54:12,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:54:12,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:54:12,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:12,515 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:12,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:13,276 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:13,277 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:54:13,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1403298271] [2021-11-23 02:54:13,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1403298271] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:13,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [666665169] [2021-11-23 02:54:13,277 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:54:13,277 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:54:13,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:54:13,278 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:54:13,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-23 02:54:13,376 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:54:13,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:54:13,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:54:13,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:13,621 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:13,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:14,168 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:14,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [666665169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:14,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201258760] [2021-11-23 02:54:14,169 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:54:14,169 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:14,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:54:14,170 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:54:14,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 02:54:14,227 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:54:14,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:54:14,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:54:14,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:14,485 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:14,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:15,032 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:54:15,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201258760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:15,032 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:54:15,033 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-23 02:54:15,033 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354731318] [2021-11-23 02:54:15,033 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:15,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:54:15,034 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:54:15,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:54:15,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:54:15,035 INFO L87 Difference]: Start difference. First operand 100 states and 144 transitions. Second operand has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 02:54:15,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:54:15,682 INFO L93 Difference]: Finished difference Result 111 states and 155 transitions. [2021-11-23 02:54:15,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:54:15,683 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 66 [2021-11-23 02:54:15,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:54:15,685 INFO L225 Difference]: With dead ends: 111 [2021-11-23 02:54:15,685 INFO L226 Difference]: Without dead ends: 97 [2021-11-23 02:54:15,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 381 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:54:15,687 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 110 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 473 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:54:15,687 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 473 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:54:15,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-23 02:54:15,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-11-23 02:54:15,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 71 states have (on average 1.1971830985915493) internal successors, (85), 76 states have internal predecessors, (85), 15 states have call successors, (15), 5 states have call predecessors, (15), 10 states have return successors, (39), 15 states have call predecessors, (39), 14 states have call successors, (39) [2021-11-23 02:54:15,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 139 transitions. [2021-11-23 02:54:15,699 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 139 transitions. Word has length 66 [2021-11-23 02:54:15,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:54:15,700 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 139 transitions. [2021-11-23 02:54:15,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 02:54:15,701 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 139 transitions. [2021-11-23 02:54:15,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 02:54:15,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:54:15,703 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:54:15,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:15,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:16,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:16,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:54:16,329 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:54:16,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:54:16,329 INFO L85 PathProgramCache]: Analyzing trace with hash -425811905, now seen corresponding path program 1 times [2021-11-23 02:54:16,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:54:16,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [45542114] [2021-11-23 02:54:16,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:16,330 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:54:16,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:54:16,332 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:54:16,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 02:54:16,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:16,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:54:16,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:18,040 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:54:18,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:21,669 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:54:21,670 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:54:21,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [45542114] [2021-11-23 02:54:21,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [45542114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:21,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1233927896] [2021-11-23 02:54:21,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:21,670 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:54:21,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:54:21,671 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:54:21,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-23 02:54:21,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:21,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 02:54:21,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:25,029 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:54:25,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:31,602 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:54:31,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1233927896] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:31,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387031593] [2021-11-23 02:54:31,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:31,602 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:31,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:54:31,603 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:54:31,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 02:54:31,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:31,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 02:54:31,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:35,755 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:54:35,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:45,377 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:54:45,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387031593] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:45,378 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:54:45,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 16, 16, 17, 17] total 65 [2021-11-23 02:54:45,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806113374] [2021-11-23 02:54:45,378 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:45,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-23 02:54:45,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:54:45,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-23 02:54:45,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=3713, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 02:54:45,381 INFO L87 Difference]: Start difference. First operand 97 states and 139 transitions. Second operand has 65 states, 65 states have (on average 1.8153846153846154) internal successors, (118), 65 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-23 02:55:13,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:13,009 INFO L93 Difference]: Finished difference Result 170 states and 236 transitions. [2021-11-23 02:55:13,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 02:55:13,011 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.8153846153846154) internal successors, (118), 65 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) Word has length 73 [2021-11-23 02:55:13,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:13,013 INFO L225 Difference]: With dead ends: 170 [2021-11-23 02:55:13,013 INFO L226 Difference]: Without dead ends: 121 [2021-11-23 02:55:13,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2290 ImplicationChecksByTransitivity, 36.8s TimeCoverageRelationStatistics Valid=1543, Invalid=7577, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 02:55:13,018 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 368 mSDsluCounter, 1646 mSDsCounter, 0 mSdLazyCounter, 1291 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 374 SdHoareTripleChecker+Valid, 1730 SdHoareTripleChecker+Invalid, 1539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 1291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:13,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [374 Valid, 1730 Invalid, 1539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 1291 Invalid, 0 Unknown, 0 Unchecked, 10.9s Time] [2021-11-23 02:55:13,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-23 02:55:13,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 102. [2021-11-23 02:55:13,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 74 states have (on average 1.1891891891891893) internal successors, (88), 80 states have internal predecessors, (88), 16 states have call successors, (16), 5 states have call predecessors, (16), 11 states have return successors, (43), 16 states have call predecessors, (43), 15 states have call successors, (43) [2021-11-23 02:55:13,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 147 transitions. [2021-11-23 02:55:13,032 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 147 transitions. Word has length 73 [2021-11-23 02:55:13,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:13,033 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 147 transitions. [2021-11-23 02:55:13,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.8153846153846154) internal successors, (118), 65 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-23 02:55:13,034 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 147 transitions. [2021-11-23 02:55:13,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 02:55:13,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:13,036 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:13,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 02:55:13,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-23 02:55:13,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-23 02:55:13,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:55:13,650 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:55:13,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:13,651 INFO L85 PathProgramCache]: Analyzing trace with hash 1804933507, now seen corresponding path program 2 times [2021-11-23 02:55:13,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:55:13,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1480124256] [2021-11-23 02:55:13,651 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:55:13,652 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:55:13,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:55:13,653 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:55:13,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 02:55:13,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:55:13,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:55:13,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:55:13,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:15,178 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:55:15,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:18,521 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:55:18,522 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:55:18,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1480124256] [2021-11-23 02:55:18,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1480124256] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:55:18,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [712121324] [2021-11-23 02:55:18,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:55:18,522 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:55:18,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:55:18,526 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:55:18,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 02:55:18,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:55:18,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:55:18,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:55:18,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:21,276 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:55:21,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:27,626 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:55:27,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [712121324] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:55:27,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861220853] [2021-11-23 02:55:27,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:55:27,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:27,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:27,628 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:27,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 02:55:27,690 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:55:27,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:55:27,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 02:55:27,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:31,664 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:55:31,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:42,047 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:55:42,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861220853] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:55:42,047 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:55:42,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 15, 16, 17, 17] total 64 [2021-11-23 02:55:42,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544432912] [2021-11-23 02:55:42,048 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:55:42,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-23 02:55:42,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:55:42,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-23 02:55:42,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=3612, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 02:55:42,050 INFO L87 Difference]: Start difference. First operand 102 states and 147 transitions. Second operand has 64 states, 64 states have (on average 1.84375) internal successors, (118), 64 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-23 02:56:13,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:13,518 INFO L93 Difference]: Finished difference Result 180 states and 243 transitions. [2021-11-23 02:56:13,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 02:56:13,520 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.84375) internal successors, (118), 64 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) Word has length 73 [2021-11-23 02:56:13,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:13,525 INFO L225 Difference]: With dead ends: 180 [2021-11-23 02:56:13,525 INFO L226 Difference]: Without dead ends: 124 [2021-11-23 02:56:13,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2216 ImplicationChecksByTransitivity, 41.8s TimeCoverageRelationStatistics Valid=1519, Invalid=7411, Unknown=0, NotChecked=0, Total=8930 [2021-11-23 02:56:13,530 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 463 mSDsluCounter, 1762 mSDsCounter, 0 mSdLazyCounter, 1212 mSolverCounterSat, 282 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 467 SdHoareTripleChecker+Valid, 1836 SdHoareTripleChecker+Invalid, 1494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 282 IncrementalHoareTripleChecker+Valid, 1212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:13,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [467 Valid, 1836 Invalid, 1494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [282 Valid, 1212 Invalid, 0 Unknown, 0 Unchecked, 9.6s Time] [2021-11-23 02:56:13,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-23 02:56:13,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 100. [2021-11-23 02:56:13,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 73 states have (on average 1.1917808219178083) internal successors, (87), 79 states have internal predecessors, (87), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (39), 15 states have call predecessors, (39), 14 states have call successors, (39) [2021-11-23 02:56:13,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 141 transitions. [2021-11-23 02:56:13,551 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 141 transitions. Word has length 73 [2021-11-23 02:56:13,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:13,552 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 141 transitions. [2021-11-23 02:56:13,552 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.84375) internal successors, (118), 64 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-23 02:56:13,552 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 141 transitions. [2021-11-23 02:56:13,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 02:56:13,554 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:13,554 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:13,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:13,774 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (45)] Ended with exit code 0 [2021-11-23 02:56:13,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:14,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:14,174 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:14,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:14,174 INFO L85 PathProgramCache]: Analyzing trace with hash 774759652, now seen corresponding path program 1 times [2021-11-23 02:56:14,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:56:14,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2088151737] [2021-11-23 02:56:14,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:14,175 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:56:14,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:56:14,176 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:56:14,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 02:56:14,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:14,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:56:14,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:14,721 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:56:14,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:15,271 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:56:15,271 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:56:15,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2088151737] [2021-11-23 02:56:15,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2088151737] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:15,271 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:15,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 10 [2021-11-23 02:56:15,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52624272] [2021-11-23 02:56:15,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:15,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:56:15,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:56:15,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:56:15,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:56:15,273 INFO L87 Difference]: Start difference. First operand 100 states and 141 transitions. Second operand has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-23 02:56:15,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:15,536 INFO L93 Difference]: Finished difference Result 114 states and 156 transitions. [2021-11-23 02:56:15,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:56:15,537 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 75 [2021-11-23 02:56:15,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:15,539 INFO L225 Difference]: With dead ends: 114 [2021-11-23 02:56:15,539 INFO L226 Difference]: Without dead ends: 105 [2021-11-23 02:56:15,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:56:15,541 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 7 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:15,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 390 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:56:15,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-23 02:56:15,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2021-11-23 02:56:15,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 73 states have (on average 1.1917808219178083) internal successors, (87), 79 states have internal predecessors, (87), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (36), 15 states have call predecessors, (36), 14 states have call successors, (36) [2021-11-23 02:56:15,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 138 transitions. [2021-11-23 02:56:15,557 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 138 transitions. Word has length 75 [2021-11-23 02:56:15,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:15,557 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 138 transitions. [2021-11-23 02:56:15,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-23 02:56:15,558 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 138 transitions. [2021-11-23 02:56:15,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 02:56:15,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:15,560 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:15,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:15,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:56:15,774 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:15,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:15,775 INFO L85 PathProgramCache]: Analyzing trace with hash 700030255, now seen corresponding path program 1 times [2021-11-23 02:56:15,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:56:15,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1578559104] [2021-11-23 02:56:15,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:15,776 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:56:15,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:56:15,777 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:56:15,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 02:56:15,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:15,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:56:15,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:17,406 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:56:17,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:20,790 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:56:20,791 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:56:20,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1578559104] [2021-11-23 02:56:20,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1578559104] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:56:20,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1598840545] [2021-11-23 02:56:20,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:20,792 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:56:20,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:56:20,793 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:56:20,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 02:56:20,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:20,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:56:20,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:23,557 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:56:23,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:30,664 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:56:30,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1598840545] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:56:30,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [474251308] [2021-11-23 02:56:30,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:30,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:30,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:30,666 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:30,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 02:56:30,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:30,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:56:30,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:31,459 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:56:31,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:34,089 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:56:34,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [474251308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:56:34,089 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:56:34,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 15, 16, 15, 16] total 43 [2021-11-23 02:56:34,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55815332] [2021-11-23 02:56:34,090 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:56:34,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 02:56:34,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:56:34,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 02:56:34,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=1560, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:56:34,093 INFO L87 Difference]: Start difference. First operand 100 states and 138 transitions. Second operand has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-23 02:56:47,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:47,824 INFO L93 Difference]: Finished difference Result 139 states and 184 transitions. [2021-11-23 02:56:47,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 02:56:47,833 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) Word has length 75 [2021-11-23 02:56:47,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:47,835 INFO L225 Difference]: With dead ends: 139 [2021-11-23 02:56:47,836 INFO L226 Difference]: Without dead ends: 116 [2021-11-23 02:56:47,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 402 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 19.8s TimeCoverageRelationStatistics Valid=650, Invalid=3010, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 02:56:47,839 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 308 mSDsluCounter, 871 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 948 SdHoareTripleChecker+Invalid, 668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:47,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [315 Valid, 948 Invalid, 668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 546 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2021-11-23 02:56:47,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-23 02:56:47,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 99. [2021-11-23 02:56:47,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 73 states have (on average 1.178082191780822) internal successors, (86), 77 states have internal predecessors, (86), 15 states have call successors, (15), 6 states have call predecessors, (15), 10 states have return successors, (31), 15 states have call predecessors, (31), 14 states have call successors, (31) [2021-11-23 02:56:47,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 132 transitions. [2021-11-23 02:56:47,859 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 132 transitions. Word has length 75 [2021-11-23 02:56:47,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:47,859 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 132 transitions. [2021-11-23 02:56:47,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-23 02:56:47,860 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 132 transitions. [2021-11-23 02:56:47,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 02:56:47,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:47,862 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:47,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:48,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:48,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:48,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:48,465 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:48,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:48,465 INFO L85 PathProgramCache]: Analyzing trace with hash 904822259, now seen corresponding path program 2 times [2021-11-23 02:56:48,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:56:48,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2021763839] [2021-11-23 02:56:48,465 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:56:48,465 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:56:48,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:56:48,466 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:56:48,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 02:56:48,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:56:48,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:56:48,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:56:48,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:50,060 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:56:50,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:53,554 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:56:53,554 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:56:53,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2021763839] [2021-11-23 02:56:53,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2021763839] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:56:53,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1522249934] [2021-11-23 02:56:53,555 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:56:53,555 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:56:53,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:56:53,565 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:56:53,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 02:56:53,719 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:56:53,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:56:53,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:56:53,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:56,548 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:56:56,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:57:03,669 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:57:03,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1522249934] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:57:03,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325390721] [2021-11-23 02:57:03,669 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:57:03,670 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:03,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:57:03,672 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:57:03,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 02:57:03,736 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:57:03,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:57:03,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:57:03,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:57:04,500 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:57:04,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:57:06,626 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:57:06,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1325390721] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:57:06,627 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:57:06,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 15, 16, 15, 16] total 43 [2021-11-23 02:57:06,628 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352939711] [2021-11-23 02:57:06,628 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:57:06,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 02:57:06,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:57:06,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 02:57:06,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1569, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:57:06,630 INFO L87 Difference]: Start difference. First operand 99 states and 132 transitions. Second operand has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-23 02:57:22,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:57:22,273 INFO L93 Difference]: Finished difference Result 128 states and 164 transitions. [2021-11-23 02:57:22,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 02:57:22,275 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) Word has length 75 [2021-11-23 02:57:22,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:57:22,276 INFO L225 Difference]: With dead ends: 128 [2021-11-23 02:57:22,276 INFO L226 Difference]: Without dead ends: 114 [2021-11-23 02:57:22,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=633, Invalid=3027, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 02:57:22,279 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 272 mSDsluCounter, 1248 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 1316 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:57:22,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [280 Valid, 1316 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2021-11-23 02:57:22,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-23 02:57:22,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 96. [2021-11-23 02:57:22,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 71 states have (on average 1.1690140845070423) internal successors, (83), 74 states have internal predecessors, (83), 15 states have call successors, (15), 6 states have call predecessors, (15), 9 states have return successors, (28), 15 states have call predecessors, (28), 14 states have call successors, (28) [2021-11-23 02:57:22,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 126 transitions. [2021-11-23 02:57:22,303 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 126 transitions. Word has length 75 [2021-11-23 02:57:22,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:57:22,304 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 126 transitions. [2021-11-23 02:57:22,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-23 02:57:22,305 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 126 transitions. [2021-11-23 02:57:22,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 02:57:22,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:57:22,307 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:57:22,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2021-11-23 02:57:22,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2021-11-23 02:57:22,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2021-11-23 02:57:22,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:22,922 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:57:22,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:57:22,923 INFO L85 PathProgramCache]: Analyzing trace with hash 1627177794, now seen corresponding path program 1 times [2021-11-23 02:57:22,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:57:22,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [52843935] [2021-11-23 02:57:22,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:57:22,923 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:57:22,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:57:22,926 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:57:22,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 02:57:23,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:57:23,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 02:57:23,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:57:25,226 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:57:25,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:57:30,668 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:57:30,668 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:57:30,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [52843935] [2021-11-23 02:57:30,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [52843935] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:57:30,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [418834714] [2021-11-23 02:57:30,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:57:30,669 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:57:30,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:57:30,684 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:57:30,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 02:57:30,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:57:30,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 02:57:30,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:57:35,990 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:57:35,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:57:47,674 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:57:47,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [418834714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:57:47,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244837027] [2021-11-23 02:57:47,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:57:47,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:47,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:57:47,675 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:57:47,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 02:57:47,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:57:47,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 02:57:47,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:57:56,403 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:57:56,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:24,138 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:58:24,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244837027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:24,139 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:58:24,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 18, 21, 23] total 86 [2021-11-23 02:58:24,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132634540] [2021-11-23 02:58:24,140 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:24,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-23 02:58:24,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:58:24,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-23 02:58:24,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=6492, Unknown=0, NotChecked=0, Total=7310 [2021-11-23 02:58:24,146 INFO L87 Difference]: Start difference. First operand 96 states and 126 transitions. Second operand has 86 states, 84 states have (on average 1.6785714285714286) internal successors, (141), 83 states have internal predecessors, (141), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-23 02:59:11,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:59:11,529 INFO L93 Difference]: Finished difference Result 143 states and 185 transitions. [2021-11-23 02:59:11,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 02:59:11,531 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 84 states have (on average 1.6785714285714286) internal successors, (141), 83 states have internal predecessors, (141), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) Word has length 82 [2021-11-23 02:59:11,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:59:11,532 INFO L225 Difference]: With dead ends: 143 [2021-11-23 02:59:11,532 INFO L226 Difference]: Without dead ends: 129 [2021-11-23 02:59:11,536 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3837 ImplicationChecksByTransitivity, 76.6s TimeCoverageRelationStatistics Valid=1674, Invalid=11898, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 02:59:11,537 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 361 mSDsluCounter, 2064 mSDsCounter, 0 mSdLazyCounter, 2033 mSolverCounterSat, 237 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 371 SdHoareTripleChecker+Valid, 2125 SdHoareTripleChecker+Invalid, 2270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 2033 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:59:11,538 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [371 Valid, 2125 Invalid, 2270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 2033 Invalid, 0 Unknown, 0 Unchecked, 18.7s Time] [2021-11-23 02:59:11,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-23 02:59:11,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 105. [2021-11-23 02:59:11,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 77 states have (on average 1.155844155844156) internal successors, (89), 80 states have internal predecessors, (89), 17 states have call successors, (17), 6 states have call predecessors, (17), 10 states have return successors, (32), 18 states have call predecessors, (32), 16 states have call successors, (32) [2021-11-23 02:59:11,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 138 transitions. [2021-11-23 02:59:11,566 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 138 transitions. Word has length 82 [2021-11-23 02:59:11,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:59:11,567 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 138 transitions. [2021-11-23 02:59:11,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 84 states have (on average 1.6785714285714286) internal successors, (141), 83 states have internal predecessors, (141), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-23 02:59:11,568 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 138 transitions. [2021-11-23 02:59:11,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 02:59:11,570 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:59:11,570 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:59:11,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 02:59:11,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 02:59:12,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-23 02:59:12,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:12,181 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:59:12,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:59:12,182 INFO L85 PathProgramCache]: Analyzing trace with hash -2114830850, now seen corresponding path program 2 times [2021-11-23 02:59:12,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:59:12,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [698745184] [2021-11-23 02:59:12,182 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:59:12,182 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:59:12,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:59:12,183 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:59:12,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 02:59:12,282 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:59:12,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:59:12,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 02:59:12,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:59:14,646 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:59:14,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:59:20,195 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:59:20,195 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:59:20,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [698745184] [2021-11-23 02:59:20,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [698745184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:59:20,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1739655646] [2021-11-23 02:59:20,195 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:59:20,196 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:59:20,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:59:20,197 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:59:20,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 02:59:20,386 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:59:20,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:59:20,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 02:59:20,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:59:25,848 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:59:25,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:59:37,774 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:59:37,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1739655646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:59:37,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038412349] [2021-11-23 02:59:37,775 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:59:37,775 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:37,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:59:37,776 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:59:37,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 02:59:38,027 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:59:38,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:59:38,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 02:59:38,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:59:45,798 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:59:45,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:00:15,356 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:00:15,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038412349] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:00:15,357 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:00:15,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 18, 22, 24] total 85 [2021-11-23 03:00:15,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451901236] [2021-11-23 03:00:15,357 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:00:15,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-23 03:00:15,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:00:15,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-23 03:00:15,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=795, Invalid=6345, Unknown=0, NotChecked=0, Total=7140 [2021-11-23 03:00:15,361 INFO L87 Difference]: Start difference. First operand 105 states and 138 transitions. Second operand has 85 states, 83 states have (on average 1.6506024096385543) internal successors, (137), 82 states have internal predecessors, (137), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-23 03:01:20,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:01:20,560 INFO L93 Difference]: Finished difference Result 161 states and 199 transitions. [2021-11-23 03:01:20,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 03:01:20,561 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 83 states have (on average 1.6506024096385543) internal successors, (137), 82 states have internal predecessors, (137), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) Word has length 82 [2021-11-23 03:01:20,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:01:20,563 INFO L225 Difference]: With dead ends: 161 [2021-11-23 03:01:20,563 INFO L226 Difference]: Without dead ends: 140 [2021-11-23 03:01:20,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3946 ImplicationChecksByTransitivity, 94.9s TimeCoverageRelationStatistics Valid=1899, Invalid=12863, Unknown=0, NotChecked=0, Total=14762 [2021-11-23 03:01:20,564 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 381 mSDsluCounter, 2022 mSDsCounter, 0 mSdLazyCounter, 2112 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 2083 SdHoareTripleChecker+Invalid, 2361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 2112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:01:20,565 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [391 Valid, 2083 Invalid, 2361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 2112 Invalid, 0 Unknown, 0 Unchecked, 19.6s Time] [2021-11-23 03:01:20,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-23 03:01:20,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 114. [2021-11-23 03:01:20,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 85 states have (on average 1.1529411764705881) internal successors, (98), 87 states have internal predecessors, (98), 18 states have call successors, (18), 7 states have call predecessors, (18), 10 states have return successors, (31), 19 states have call predecessors, (31), 17 states have call successors, (31) [2021-11-23 03:01:20,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 147 transitions. [2021-11-23 03:01:20,579 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 147 transitions. Word has length 82 [2021-11-23 03:01:20,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:01:20,579 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 147 transitions. [2021-11-23 03:01:20,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 83 states have (on average 1.6506024096385543) internal successors, (137), 82 states have internal predecessors, (137), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-23 03:01:20,580 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 147 transitions. [2021-11-23 03:01:20,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 03:01:20,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:01:20,582 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:01:20,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 03:01:20,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 03:01:21,004 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-23 03:01:21,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:01:21,184 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:01:21,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:01:21,185 INFO L85 PathProgramCache]: Analyzing trace with hash -1402295107, now seen corresponding path program 1 times [2021-11-23 03:01:21,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:01:21,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [244117618] [2021-11-23 03:01:21,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:01:21,185 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:01:21,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:01:21,186 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:01:21,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 03:01:21,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:01:21,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:01:21,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:01:21,991 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:01:21,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:01:23,208 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:01:23,209 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:01:23,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [244117618] [2021-11-23 03:01:23,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [244117618] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:01:23,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [761733379] [2021-11-23 03:01:23,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:01:23,209 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:01:23,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:01:23,211 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:01:23,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 03:01:23,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:01:23,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:01:23,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:01:23,658 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:01:23,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:01:24,426 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:01:24,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [761733379] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:01:24,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331131253] [2021-11-23 03:01:24,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:01:24,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:01:24,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:01:24,428 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:01:24,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 03:01:24,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:01:24,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:01:24,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:01:24,905 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:01:24,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:01:25,679 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:01:25,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331131253] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:01:25,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:01:25,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 15 [2021-11-23 03:01:25,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363424054] [2021-11-23 03:01:25,679 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:01:25,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 03:01:25,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:01:25,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 03:01:25,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-23 03:01:25,681 INFO L87 Difference]: Start difference. First operand 114 states and 147 transitions. Second operand has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 15 states have internal predecessors, (67), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-23 03:01:27,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:01:27,541 INFO L93 Difference]: Finished difference Result 123 states and 155 transitions. [2021-11-23 03:01:27,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 03:01:27,542 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 15 states have internal predecessors, (67), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) Word has length 83 [2021-11-23 03:01:27,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:01:27,543 INFO L225 Difference]: With dead ends: 123 [2021-11-23 03:01:27,543 INFO L226 Difference]: Without dead ends: 112 [2021-11-23 03:01:27,544 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-11-23 03:01:27,545 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 121 mSDsluCounter, 656 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 735 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:01:27,545 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 735 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 03:01:27,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-23 03:01:27,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2021-11-23 03:01:27,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 84 states have (on average 1.1547619047619047) internal successors, (97), 86 states have internal predecessors, (97), 17 states have call successors, (17), 7 states have call predecessors, (17), 10 states have return successors, (29), 18 states have call predecessors, (29), 16 states have call successors, (29) [2021-11-23 03:01:27,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 143 transitions. [2021-11-23 03:01:27,561 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 143 transitions. Word has length 83 [2021-11-23 03:01:27,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:01:27,562 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 143 transitions. [2021-11-23 03:01:27,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 15 states have internal predecessors, (67), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-23 03:01:27,562 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 143 transitions. [2021-11-23 03:01:27,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 03:01:27,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:01:27,564 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:01:27,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-23 03:01:27,792 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (60)] Ended with exit code 0 [2021-11-23 03:01:27,985 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (61)] Ended with exit code 0 [2021-11-23 03:01:28,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:01:28,185 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:01:28,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:01:28,185 INFO L85 PathProgramCache]: Analyzing trace with hash 1128450436, now seen corresponding path program 1 times [2021-11-23 03:01:28,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:01:28,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1251188802] [2021-11-23 03:01:28,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:01:28,186 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:01:28,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:01:28,186 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:01:28,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 03:01:28,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:01:28,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 03:01:28,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:01:30,551 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 03:01:30,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:01:35,718 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:01:35,718 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:01:35,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1251188802] [2021-11-23 03:01:35,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1251188802] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:01:35,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [867151107] [2021-11-23 03:01:35,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:01:35,718 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:01:35,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:01:35,719 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:01:35,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 03:01:35,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:01:35,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 03:01:35,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:01:41,058 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 03:01:41,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:01:51,277 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:01:51,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [867151107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:01:51,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [292977414] [2021-11-23 03:01:51,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:01:51,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:01:51,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:01:51,280 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:01:51,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 03:01:51,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:01:51,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 03:01:51,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:01:59,657 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 03:01:59,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:02:15,447 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:02:15,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [292977414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:02:15,447 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:02:15,448 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 17, 22, 24] total 82 [2021-11-23 03:02:15,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325630791] [2021-11-23 03:02:15,448 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:02:15,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-23 03:02:15,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:02:15,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-23 03:02:15,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=6043, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 03:02:15,450 INFO L87 Difference]: Start difference. First operand 112 states and 143 transitions. Second operand has 82 states, 80 states have (on average 1.675) internal successors, (134), 79 states have internal predecessors, (134), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) [2021-11-23 03:02:52,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:52,197 INFO L93 Difference]: Finished difference Result 156 states and 190 transitions. [2021-11-23 03:02:52,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 03:02:52,199 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 80 states have (on average 1.675) internal successors, (134), 79 states have internal predecessors, (134), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) Word has length 80 [2021-11-23 03:02:52,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:52,203 INFO L225 Difference]: With dead ends: 156 [2021-11-23 03:02:52,203 INFO L226 Difference]: Without dead ends: 136 [2021-11-23 03:02:52,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 393 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3704 ImplicationChecksByTransitivity, 55.0s TimeCoverageRelationStatistics Valid=1678, Invalid=11894, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 03:02:52,206 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 255 mSDsluCounter, 2158 mSDsCounter, 0 mSdLazyCounter, 2110 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 2232 SdHoareTripleChecker+Invalid, 2383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 2110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:52,206 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [264 Valid, 2232 Invalid, 2383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 2110 Invalid, 0 Unknown, 0 Unchecked, 17.2s Time] [2021-11-23 03:02:52,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-23 03:02:52,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 121. [2021-11-23 03:02:52,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 92 states have (on average 1.141304347826087) internal successors, (105), 93 states have internal predecessors, (105), 18 states have call successors, (18), 8 states have call predecessors, (18), 10 states have return successors, (27), 19 states have call predecessors, (27), 17 states have call successors, (27) [2021-11-23 03:02:52,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 150 transitions. [2021-11-23 03:02:52,225 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 150 transitions. Word has length 80 [2021-11-23 03:02:52,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:52,226 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 150 transitions. [2021-11-23 03:02:52,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 80 states have (on average 1.675) internal successors, (134), 79 states have internal predecessors, (134), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) [2021-11-23 03:02:52,226 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 150 transitions. [2021-11-23 03:02:52,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 03:02:52,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:52,228 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:52,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2021-11-23 03:02:52,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-23 03:02:52,647 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (63)] Ended with exit code 0 [2021-11-23 03:02:52,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:02:52,839 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:52,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:52,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1440446079, now seen corresponding path program 2 times [2021-11-23 03:02:52,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:02:52,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1982249874] [2021-11-23 03:02:52,840 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:02:52,840 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:02:52,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:02:52,841 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:02:52,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 03:02:52,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:02:52,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:02:52,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:02:52,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:53,615 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:02:53,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:02:54,815 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:02:54,815 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:02:54,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1982249874] [2021-11-23 03:02:54,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1982249874] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:02:54,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2128712018] [2021-11-23 03:02:54,815 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:02:54,816 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:02:54,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:02:54,816 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:02:54,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 03:02:54,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:02:54,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:02:54,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:02:54,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:55,281 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:02:55,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:02:56,023 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:02:56,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2128712018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:02:56,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762436969] [2021-11-23 03:02:56,024 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:02:56,033 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:56,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:02:56,034 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:02:56,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e379fd7-1cdb-4c02-aa19-5ee164b23656/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 03:02:56,103 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:02:56,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:02:56,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:02:56,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:56,443 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:02:56,444 INFO L328 TraceCheckSpWp]: Computing backward predicates...