./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec13_product23.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec13_product23.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P --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 ef17cfb4a2c8358ea255253edc0610051a64c94a86cd92ff89d3b074c51925f6 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:18:36,001 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:18:36,004 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:18:36,055 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:18:36,055 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:18:36,059 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:18:36,061 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:18:36,065 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:18:36,068 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:18:36,073 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:18:36,074 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:18:36,076 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:18:36,077 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:18:36,079 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:18:36,081 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:18:36,086 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:18:36,088 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:18:36,089 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:18:36,091 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:18:36,099 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:18:36,101 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:18:36,102 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:18:36,106 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:18:36,107 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:18:36,116 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:18:36,116 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:18:36,117 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:18:36,119 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:18:36,119 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:18:36,121 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:18:36,121 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:18:36,122 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:18:36,124 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:18:36,126 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:18:36,127 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:18:36,128 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:18:36,128 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:18:36,129 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:18:36,129 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:18:36,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:18:36,131 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:18:36,132 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:18:36,174 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:18:36,175 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:18:36,175 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:18:36,176 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:18:36,176 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:18:36,177 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:18:36,177 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:18:36,177 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:18:36,177 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:18:36,178 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:18:36,179 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:18:36,179 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:18:36,179 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:18:36,179 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:18:36,179 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:18:36,180 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:18:36,180 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:18:36,180 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:18:36,181 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:18:36,182 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:18:36,182 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:18:36,182 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:18:36,182 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:18:36,183 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:18:36,183 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:18:36,183 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:18:36,184 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:18:36,185 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:18:36,185 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:18:36,185 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:18:36,185 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:18:36,186 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:18:36,186 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:18:36,186 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:18:36,186 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:18:36,187 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:18:36,187 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:18:36,187 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:18:36,187 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:18:36,188 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:18:36,188 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:18:36,188 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_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ef17cfb4a2c8358ea255253edc0610051a64c94a86cd92ff89d3b074c51925f6 [2021-11-21 00:18:36,499 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:18:36,527 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:18:36,530 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:18:36,531 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:18:36,531 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:18:36,533 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/product-lines/elevator_spec13_product23.cil.c [2021-11-21 00:18:36,611 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/data/43fd4577b/5576118758cd4c698e8b617f891b7d58/FLAGfc7445f2a [2021-11-21 00:18:37,265 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:18:37,266 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/sv-benchmarks/c/product-lines/elevator_spec13_product23.cil.c [2021-11-21 00:18:37,285 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/data/43fd4577b/5576118758cd4c698e8b617f891b7d58/FLAGfc7445f2a [2021-11-21 00:18:37,420 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/data/43fd4577b/5576118758cd4c698e8b617f891b7d58 [2021-11-21 00:18:37,423 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:18:37,424 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:18:37,426 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:18:37,426 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:18:37,440 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:18:37,441 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:18:37" (1/1) ... [2021-11-21 00:18:37,442 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@129f565b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:37, skipping insertion in model container [2021-11-21 00:18:37,442 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:18:37" (1/1) ... [2021-11-21 00:18:37,449 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:18:37,532 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:18:37,745 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_9727d38d-5975-40e8-8838-0130f55d973e/sv-benchmarks/c/product-lines/elevator_spec13_product23.cil.c[1811,1824] [2021-11-21 00:18:38,040 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:18:38,049 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:18:38,081 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_9727d38d-5975-40e8-8838-0130f55d973e/sv-benchmarks/c/product-lines/elevator_spec13_product23.cil.c[1811,1824] [2021-11-21 00:18:38,175 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:18:38,203 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:18:38,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38 WrapperNode [2021-11-21 00:18:38,204 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:18:38,205 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:18:38,205 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:18:38,206 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:18:38,213 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (1/1) ... [2021-11-21 00:18:38,264 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (1/1) ... [2021-11-21 00:18:38,352 INFO L137 Inliner]: procedures = 94, calls = 346, calls flagged for inlining = 26, calls inlined = 23, statements flattened = 873 [2021-11-21 00:18:38,353 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:18:38,354 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:18:38,354 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:18:38,354 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:18:38,362 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (1/1) ... [2021-11-21 00:18:38,363 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (1/1) ... [2021-11-21 00:18:38,382 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (1/1) ... [2021-11-21 00:18:38,383 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (1/1) ... [2021-11-21 00:18:38,444 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (1/1) ... [2021-11-21 00:18:38,476 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (1/1) ... [2021-11-21 00:18:38,482 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (1/1) ... [2021-11-21 00:18:38,492 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:18:38,502 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:18:38,502 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:18:38,502 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:18:38,504 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (1/1) ... [2021-11-21 00:18:38,511 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:18:38,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:38,558 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:18:38,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:18:38,621 INFO L130 BoogieDeclarations]: Found specification of procedure angelinaCall [2021-11-21 00:18:38,622 INFO L138 BoogieDeclarations]: Found implementation of procedure angelinaCall [2021-11-21 00:18:38,622 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:18:38,622 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2021-11-21 00:18:38,622 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2021-11-21 00:18:38,622 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2021-11-21 00:18:38,622 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2021-11-21 00:18:38,623 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-21 00:18:38,623 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-21 00:18:38,623 INFO L130 BoogieDeclarations]: Found specification of procedure existInLiftCallsInDirection [2021-11-21 00:18:38,623 INFO L138 BoogieDeclarations]: Found implementation of procedure existInLiftCallsInDirection [2021-11-21 00:18:38,623 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-21 00:18:38,623 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-21 00:18:38,623 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2021-11-21 00:18:38,624 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2021-11-21 00:18:38,624 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-21 00:18:38,624 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-21 00:18:38,624 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2021-11-21 00:18:38,624 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2021-11-21 00:18:38,624 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-21 00:18:38,624 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-21 00:18:38,625 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-21 00:18:38,625 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-21 00:18:38,625 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-21 00:18:38,625 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-21 00:18:38,625 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-21 00:18:38,626 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-21 00:18:38,626 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-21 00:18:38,626 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-21 00:18:38,626 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-21 00:18:38,626 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-21 00:18:38,626 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-21 00:18:38,627 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-21 00:18:38,627 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-21 00:18:38,627 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-21 00:18:38,627 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-21 00:18:38,627 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-21 00:18:38,628 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-21 00:18:38,628 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-21 00:18:38,628 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-21 00:18:38,628 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-21 00:18:38,628 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-21 00:18:38,628 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-21 00:18:38,629 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-21 00:18:38,629 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-21 00:18:38,629 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:18:38,630 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-21 00:18:38,631 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-21 00:18:38,631 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-21 00:18:38,632 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-21 00:18:38,633 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-21 00:18:38,633 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-21 00:18:38,633 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-21 00:18:38,633 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-21 00:18:38,634 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__weight [2021-11-21 00:18:38,634 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__weight [2021-11-21 00:18:38,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:18:38,635 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:18:38,635 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-21 00:18:38,635 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-21 00:18:38,857 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:18:38,859 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:18:39,880 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:18:40,529 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:18:40,530 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-21 00:18:40,535 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:18:40 BoogieIcfgContainer [2021-11-21 00:18:40,535 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:18:40,537 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:18:40,537 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:18:40,540 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:18:40,540 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:18:37" (1/3) ... [2021-11-21 00:18:40,541 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16654c00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:18:40, skipping insertion in model container [2021-11-21 00:18:40,542 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:18:38" (2/3) ... [2021-11-21 00:18:40,542 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16654c00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:18:40, skipping insertion in model container [2021-11-21 00:18:40,542 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:18:40" (3/3) ... [2021-11-21 00:18:40,544 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec13_product23.cil.c [2021-11-21 00:18:40,549 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:18:40,549 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:18:40,614 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:18:40,625 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 [2021-11-21 00:18:40,625 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:18:40,667 INFO L276 IsEmpty]: Start isEmpty. Operand has 436 states, 298 states have (on average 1.5771812080536913) internal successors, (470), 316 states have internal predecessors, (470), 108 states have call successors, (108), 28 states have call predecessors, (108), 28 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-21 00:18:40,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-21 00:18:40,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:40,695 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:40,696 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:40,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:40,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1131213581, now seen corresponding path program 1 times [2021-11-21 00:18:40,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:40,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996341955] [2021-11-21 00:18:40,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:40,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:41,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:41,376 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-21 00:18:41,376 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:41,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996341955] [2021-11-21 00:18:41,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996341955] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:41,378 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:18:41,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:18:41,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127898438] [2021-11-21 00:18:41,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:41,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:18:41,384 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:41,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:18:41,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:18:41,413 INFO L87 Difference]: Start difference. First operand has 436 states, 298 states have (on average 1.5771812080536913) internal successors, (470), 316 states have internal predecessors, (470), 108 states have call successors, (108), 28 states have call predecessors, (108), 28 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) Second operand has 5 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 3 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-21 00:18:42,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:42,149 INFO L93 Difference]: Finished difference Result 1276 states and 2046 transitions. [2021-11-21 00:18:42,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:18:42,155 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 3 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 96 [2021-11-21 00:18:42,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:42,186 INFO L225 Difference]: With dead ends: 1276 [2021-11-21 00:18:42,186 INFO L226 Difference]: Without dead ends: 845 [2021-11-21 00:18:42,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:18:42,204 INFO L933 BasicCegarLoop]: 878 mSDtfsCounter, 650 mSDsluCounter, 2284 mSDsCounter, 0 mSdLazyCounter, 415 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 650 SdHoareTripleChecker+Valid, 3043 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:42,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [650 Valid, 3043 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 415 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:18:42,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 845 states. [2021-11-21 00:18:42,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 845 to 837. [2021-11-21 00:18:42,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 837 states, 579 states have (on average 1.5613126079447324) internal successors, (904), 609 states have internal predecessors, (904), 206 states have call successors, (206), 54 states have call predecessors, (206), 51 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2021-11-21 00:18:42,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1320 transitions. [2021-11-21 00:18:42,437 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1320 transitions. Word has length 96 [2021-11-21 00:18:42,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:42,439 INFO L470 AbstractCegarLoop]: Abstraction has 837 states and 1320 transitions. [2021-11-21 00:18:42,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 3 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-21 00:18:42,440 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1320 transitions. [2021-11-21 00:18:42,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-21 00:18:42,452 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:42,453 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:42,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:18:42,455 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:42,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:42,457 INFO L85 PathProgramCache]: Analyzing trace with hash -220155645, now seen corresponding path program 1 times [2021-11-21 00:18:42,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:42,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804258444] [2021-11-21 00:18:42,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:42,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:42,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:42,686 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:18:42,687 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:42,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804258444] [2021-11-21 00:18:42,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804258444] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:42,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784348826] [2021-11-21 00:18:42,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:42,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:42,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:42,694 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:42,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:18:43,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:43,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 1359 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:18:43,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:43,316 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:18:43,316 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:43,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784348826] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:43,317 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:43,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2021-11-21 00:18:43,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437547307] [2021-11-21 00:18:43,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:43,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:18:43,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:43,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:18:43,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:18:43,320 INFO L87 Difference]: Start difference. First operand 837 states and 1320 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-21 00:18:43,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:43,523 INFO L93 Difference]: Finished difference Result 1671 states and 2655 transitions. [2021-11-21 00:18:43,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:18:43,524 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 100 [2021-11-21 00:18:43,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:43,532 INFO L225 Difference]: With dead ends: 1671 [2021-11-21 00:18:43,533 INFO L226 Difference]: Without dead ends: 849 [2021-11-21 00:18:43,539 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:18:43,541 INFO L933 BasicCegarLoop]: 626 mSDtfsCounter, 85 mSDsluCounter, 1238 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 1791 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:43,542 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 1791 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:18:43,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 849 states. [2021-11-21 00:18:43,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 849 to 849. [2021-11-21 00:18:43,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 849 states, 589 states have (on average 1.5551782682512734) internal successors, (916), 619 states have internal predecessors, (916), 206 states have call successors, (206), 56 states have call predecessors, (206), 53 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2021-11-21 00:18:43,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 849 states to 849 states and 1332 transitions. [2021-11-21 00:18:43,613 INFO L78 Accepts]: Start accepts. Automaton has 849 states and 1332 transitions. Word has length 100 [2021-11-21 00:18:43,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:43,614 INFO L470 AbstractCegarLoop]: Abstraction has 849 states and 1332 transitions. [2021-11-21 00:18:43,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-21 00:18:43,615 INFO L276 IsEmpty]: Start isEmpty. Operand 849 states and 1332 transitions. [2021-11-21 00:18:43,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-21 00:18:43,620 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:43,620 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:43,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:43,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:43,841 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:43,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:43,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1039250502, now seen corresponding path program 1 times [2021-11-21 00:18:43,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:43,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158623217] [2021-11-21 00:18:43,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:43,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:43,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:44,011 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:18:44,012 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:44,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158623217] [2021-11-21 00:18:44,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158623217] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:44,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102370065] [2021-11-21 00:18:44,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:44,017 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:44,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:44,026 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:44,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:18:44,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:44,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 1364 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:18:44,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:44,576 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 00:18:44,576 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:44,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102370065] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:44,577 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:44,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-21 00:18:44,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773376559] [2021-11-21 00:18:44,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:44,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:18:44,578 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:44,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:18:44,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:18:44,579 INFO L87 Difference]: Start difference. First operand 849 states and 1332 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-21 00:18:44,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:44,755 INFO L93 Difference]: Finished difference Result 1689 states and 2665 transitions. [2021-11-21 00:18:44,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:18:44,756 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 102 [2021-11-21 00:18:44,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:44,764 INFO L225 Difference]: With dead ends: 1689 [2021-11-21 00:18:44,764 INFO L226 Difference]: Without dead ends: 847 [2021-11-21 00:18:44,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:18:44,771 INFO L933 BasicCegarLoop]: 625 mSDtfsCounter, 91 mSDsluCounter, 1234 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 1787 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:44,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 1787 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:18:44,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 847 states. [2021-11-21 00:18:44,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 847 to 847. [2021-11-21 00:18:44,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 847 states, 587 states have (on average 1.546848381601363) internal successors, (908), 617 states have internal predecessors, (908), 206 states have call successors, (206), 56 states have call predecessors, (206), 53 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2021-11-21 00:18:44,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 847 states to 847 states and 1324 transitions. [2021-11-21 00:18:44,823 INFO L78 Accepts]: Start accepts. Automaton has 847 states and 1324 transitions. Word has length 102 [2021-11-21 00:18:44,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:44,824 INFO L470 AbstractCegarLoop]: Abstraction has 847 states and 1324 transitions. [2021-11-21 00:18:44,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-21 00:18:44,825 INFO L276 IsEmpty]: Start isEmpty. Operand 847 states and 1324 transitions. [2021-11-21 00:18:44,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-21 00:18:44,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:44,829 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:44,866 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-21 00:18:45,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:45,054 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:45,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:45,054 INFO L85 PathProgramCache]: Analyzing trace with hash -1271019110, now seen corresponding path program 1 times [2021-11-21 00:18:45,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:45,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806817800] [2021-11-21 00:18:45,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:45,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:45,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:45,176 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 00:18:45,176 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:45,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806817800] [2021-11-21 00:18:45,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [806817800] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:45,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454740430] [2021-11-21 00:18:45,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:45,178 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:45,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:45,179 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:45,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:18:45,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:45,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 1368 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:18:45,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:45,722 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:18:45,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:45,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454740430] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:45,723 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:45,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2021-11-21 00:18:45,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706139017] [2021-11-21 00:18:45,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:45,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:18:45,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:45,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:18:45,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:18:45,726 INFO L87 Difference]: Start difference. First operand 847 states and 1324 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-21 00:18:46,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:46,679 INFO L93 Difference]: Finished difference Result 2071 states and 3280 transitions. [2021-11-21 00:18:46,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:18:46,680 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 103 [2021-11-21 00:18:46,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:46,690 INFO L225 Difference]: With dead ends: 2071 [2021-11-21 00:18:46,690 INFO L226 Difference]: Without dead ends: 1239 [2021-11-21 00:18:46,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:18:46,699 INFO L933 BasicCegarLoop]: 774 mSDtfsCounter, 640 mSDsluCounter, 1676 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 643 SdHoareTripleChecker+Valid, 2352 SdHoareTripleChecker+Invalid, 940 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:46,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [643 Valid, 2352 Invalid, 940 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 00:18:46,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1239 states. [2021-11-21 00:18:46,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1239 to 1219. [2021-11-21 00:18:46,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1219 states, 844 states have (on average 1.4928909952606635) internal successors, (1260), 889 states have internal predecessors, (1260), 294 states have call successors, (294), 84 states have call predecessors, (294), 80 states have return successors, (322), 282 states have call predecessors, (322), 289 states have call successors, (322) [2021-11-21 00:18:46,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1219 states to 1219 states and 1876 transitions. [2021-11-21 00:18:46,779 INFO L78 Accepts]: Start accepts. Automaton has 1219 states and 1876 transitions. Word has length 103 [2021-11-21 00:18:46,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:46,779 INFO L470 AbstractCegarLoop]: Abstraction has 1219 states and 1876 transitions. [2021-11-21 00:18:46,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-21 00:18:46,780 INFO L276 IsEmpty]: Start isEmpty. Operand 1219 states and 1876 transitions. [2021-11-21 00:18:46,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-21 00:18:46,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:46,784 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:46,822 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:47,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:47,003 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:47,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:47,004 INFO L85 PathProgramCache]: Analyzing trace with hash 768296916, now seen corresponding path program 1 times [2021-11-21 00:18:47,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:47,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [631991718] [2021-11-21 00:18:47,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:47,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:47,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:47,125 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:18:47,125 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:47,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [631991718] [2021-11-21 00:18:47,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [631991718] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:47,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [263836270] [2021-11-21 00:18:47,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:47,126 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:47,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:47,138 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:47,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:18:47,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:47,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 1369 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:18:47,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:47,668 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 00:18:47,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:47,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [263836270] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:47,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:47,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2021-11-21 00:18:47,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333740623] [2021-11-21 00:18:47,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:47,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:18:47,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:47,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:18:47,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:18:47,672 INFO L87 Difference]: Start difference. First operand 1219 states and 1876 transitions. Second operand has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-21 00:18:48,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:48,509 INFO L93 Difference]: Finished difference Result 2650 states and 4075 transitions. [2021-11-21 00:18:48,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 00:18:48,510 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) Word has length 104 [2021-11-21 00:18:48,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:48,524 INFO L225 Difference]: With dead ends: 2650 [2021-11-21 00:18:48,524 INFO L226 Difference]: Without dead ends: 1446 [2021-11-21 00:18:48,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-11-21 00:18:48,538 INFO L933 BasicCegarLoop]: 909 mSDtfsCounter, 778 mSDsluCounter, 2702 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 328 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 779 SdHoareTripleChecker+Valid, 3453 SdHoareTripleChecker+Invalid, 793 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 328 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:48,538 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [779 Valid, 3453 Invalid, 793 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [328 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:18:48,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1446 states. [2021-11-21 00:18:48,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1446 to 1427. [2021-11-21 00:18:48,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1427 states, 1005 states have (on average 1.4796019900497512) internal successors, (1487), 1048 states have internal predecessors, (1487), 318 states have call successors, (318), 108 states have call predecessors, (318), 103 states have return successors, (373), 307 states have call predecessors, (373), 311 states have call successors, (373) [2021-11-21 00:18:48,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1427 states to 1427 states and 2178 transitions. [2021-11-21 00:18:48,628 INFO L78 Accepts]: Start accepts. Automaton has 1427 states and 2178 transitions. Word has length 104 [2021-11-21 00:18:48,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:48,629 INFO L470 AbstractCegarLoop]: Abstraction has 1427 states and 2178 transitions. [2021-11-21 00:18:48,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-21 00:18:48,629 INFO L276 IsEmpty]: Start isEmpty. Operand 1427 states and 2178 transitions. [2021-11-21 00:18:48,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-21 00:18:48,633 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:48,634 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:48,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:48,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:48,858 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:48,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:48,858 INFO L85 PathProgramCache]: Analyzing trace with hash 437325725, now seen corresponding path program 1 times [2021-11-21 00:18:48,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:48,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1813967060] [2021-11-21 00:18:48,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:48,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:48,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:48,956 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:18:48,956 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:48,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1813967060] [2021-11-21 00:18:48,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1813967060] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:48,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298120167] [2021-11-21 00:18:48,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:48,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:48,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:48,958 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:48,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:18:49,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:49,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 1371 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:18:49,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:49,441 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:18:49,441 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:49,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298120167] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:49,442 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:49,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2021-11-21 00:18:49,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203460310] [2021-11-21 00:18:49,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:49,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:18:49,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:49,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:18:49,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:18:49,444 INFO L87 Difference]: Start difference. First operand 1427 states and 2178 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-21 00:18:49,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:49,658 INFO L93 Difference]: Finished difference Result 2863 states and 4446 transitions. [2021-11-21 00:18:49,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:18:49,658 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) Word has length 104 [2021-11-21 00:18:49,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:49,672 INFO L225 Difference]: With dead ends: 2863 [2021-11-21 00:18:49,672 INFO L226 Difference]: Without dead ends: 1459 [2021-11-21 00:18:49,685 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:18:49,686 INFO L933 BasicCegarLoop]: 640 mSDtfsCounter, 2 mSDsluCounter, 2018 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2545 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:49,686 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2545 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:18:49,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1459 states. [2021-11-21 00:18:49,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1459 to 1439. [2021-11-21 00:18:49,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1439 states, 1014 states have (on average 1.47534516765286) internal successors, (1496), 1057 states have internal predecessors, (1496), 318 states have call successors, (318), 108 states have call predecessors, (318), 106 states have return successors, (376), 310 states have call predecessors, (376), 311 states have call successors, (376) [2021-11-21 00:18:49,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1439 states to 1439 states and 2190 transitions. [2021-11-21 00:18:49,776 INFO L78 Accepts]: Start accepts. Automaton has 1439 states and 2190 transitions. Word has length 104 [2021-11-21 00:18:49,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:49,777 INFO L470 AbstractCegarLoop]: Abstraction has 1439 states and 2190 transitions. [2021-11-21 00:18:49,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-21 00:18:49,777 INFO L276 IsEmpty]: Start isEmpty. Operand 1439 states and 2190 transitions. [2021-11-21 00:18:49,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-21 00:18:49,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:49,781 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:49,821 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:50,009 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:50,010 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:50,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:50,010 INFO L85 PathProgramCache]: Analyzing trace with hash -1012643388, now seen corresponding path program 1 times [2021-11-21 00:18:50,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:50,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093965422] [2021-11-21 00:18:50,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:50,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:50,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:50,106 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:18:50,107 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:50,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093965422] [2021-11-21 00:18:50,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093965422] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:50,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1859500410] [2021-11-21 00:18:50,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:50,108 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:50,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:50,127 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:50,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:18:50,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:50,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 1375 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:18:50,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:50,601 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:18:50,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:50,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1859500410] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:50,602 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:50,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-21 00:18:50,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185680014] [2021-11-21 00:18:50,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:50,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:18:50,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:50,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:18:50,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:18:50,603 INFO L87 Difference]: Start difference. First operand 1439 states and 2190 transitions. Second operand has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-21 00:18:50,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:50,898 INFO L93 Difference]: Finished difference Result 2929 states and 4525 transitions. [2021-11-21 00:18:50,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:18:50,899 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 106 [2021-11-21 00:18:50,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:50,910 INFO L225 Difference]: With dead ends: 2929 [2021-11-21 00:18:50,911 INFO L226 Difference]: Without dead ends: 1514 [2021-11-21 00:18:50,922 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:18:50,923 INFO L933 BasicCegarLoop]: 623 mSDtfsCounter, 19 mSDsluCounter, 1182 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 1747 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:50,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 1747 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:18:50,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1514 states. [2021-11-21 00:18:50,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1496. [2021-11-21 00:18:50,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1496 states, 1071 states have (on average 1.4836601307189543) internal successors, (1589), 1114 states have internal predecessors, (1589), 318 states have call successors, (318), 108 states have call predecessors, (318), 106 states have return successors, (376), 310 states have call predecessors, (376), 311 states have call successors, (376) [2021-11-21 00:18:51,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1496 states to 1496 states and 2283 transitions. [2021-11-21 00:18:51,010 INFO L78 Accepts]: Start accepts. Automaton has 1496 states and 2283 transitions. Word has length 106 [2021-11-21 00:18:51,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:51,011 INFO L470 AbstractCegarLoop]: Abstraction has 1496 states and 2283 transitions. [2021-11-21 00:18:51,011 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-21 00:18:51,012 INFO L276 IsEmpty]: Start isEmpty. Operand 1496 states and 2283 transitions. [2021-11-21 00:18:51,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-21 00:18:51,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:51,016 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:51,060 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:51,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:51,242 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:51,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:51,242 INFO L85 PathProgramCache]: Analyzing trace with hash -1703439910, now seen corresponding path program 1 times [2021-11-21 00:18:51,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:51,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771714359] [2021-11-21 00:18:51,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:51,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:51,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:51,354 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:18:51,355 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:51,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771714359] [2021-11-21 00:18:51,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [771714359] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:51,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482693920] [2021-11-21 00:18:51,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:51,356 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:51,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:51,358 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:51,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:18:51,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:51,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 1377 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:18:51,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:51,848 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:18:51,848 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:51,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482693920] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:51,849 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:51,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2021-11-21 00:18:51,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018780448] [2021-11-21 00:18:51,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:51,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:18:51,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:51,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:18:51,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:18:51,851 INFO L87 Difference]: Start difference. First operand 1496 states and 2283 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-21 00:18:52,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:52,841 INFO L93 Difference]: Finished difference Result 3578 states and 5662 transitions. [2021-11-21 00:18:52,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:18:52,842 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 108 [2021-11-21 00:18:52,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:52,861 INFO L225 Difference]: With dead ends: 3578 [2021-11-21 00:18:52,862 INFO L226 Difference]: Without dead ends: 2519 [2021-11-21 00:18:52,873 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:18:52,874 INFO L933 BasicCegarLoop]: 801 mSDtfsCounter, 649 mSDsluCounter, 1716 mSDsCounter, 0 mSdLazyCounter, 918 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 651 SdHoareTripleChecker+Valid, 2419 SdHoareTripleChecker+Invalid, 951 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 918 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:52,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [651 Valid, 2419 Invalid, 951 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 918 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 00:18:52,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2519 states. [2021-11-21 00:18:53,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2519 to 2466. [2021-11-21 00:18:53,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2466 states, 1767 states have (on average 1.4770797962648556) internal successors, (2610), 1836 states have internal predecessors, (2610), 520 states have call successors, (520), 180 states have call predecessors, (520), 178 states have return successors, (737), 510 states have call predecessors, (737), 509 states have call successors, (737) [2021-11-21 00:18:53,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2466 states to 2466 states and 3867 transitions. [2021-11-21 00:18:53,031 INFO L78 Accepts]: Start accepts. Automaton has 2466 states and 3867 transitions. Word has length 108 [2021-11-21 00:18:53,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:53,032 INFO L470 AbstractCegarLoop]: Abstraction has 2466 states and 3867 transitions. [2021-11-21 00:18:53,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-21 00:18:53,033 INFO L276 IsEmpty]: Start isEmpty. Operand 2466 states and 3867 transitions. [2021-11-21 00:18:53,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-21 00:18:53,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:53,037 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:53,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:53,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 00:18:53,252 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:53,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:53,253 INFO L85 PathProgramCache]: Analyzing trace with hash 326222276, now seen corresponding path program 1 times [2021-11-21 00:18:53,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:53,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944975721] [2021-11-21 00:18:53,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:53,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:53,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:53,366 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:18:53,366 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:53,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944975721] [2021-11-21 00:18:53,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944975721] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:53,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891333178] [2021-11-21 00:18:53,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:53,367 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:53,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:53,368 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:53,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:18:53,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:53,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:18:53,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:53,851 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:18:53,851 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:53,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [891333178] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:53,851 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:53,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2021-11-21 00:18:53,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351641716] [2021-11-21 00:18:53,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:53,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:18:53,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:53,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:18:53,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:18:53,853 INFO L87 Difference]: Start difference. First operand 2466 states and 3867 transitions. Second operand has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-21 00:18:54,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:54,134 INFO L93 Difference]: Finished difference Result 4972 states and 7958 transitions. [2021-11-21 00:18:54,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:18:54,135 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 108 [2021-11-21 00:18:54,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:54,154 INFO L225 Difference]: With dead ends: 4972 [2021-11-21 00:18:54,154 INFO L226 Difference]: Without dead ends: 2530 [2021-11-21 00:18:54,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:18:54,179 INFO L933 BasicCegarLoop]: 637 mSDtfsCounter, 4 mSDsluCounter, 1308 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 1873 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:54,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 1873 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:18:54,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2530 states. [2021-11-21 00:18:54,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2530 to 2476. [2021-11-21 00:18:54,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2476 states, 1777 states have (on average 1.4642656162070906) internal successors, (2602), 1846 states have internal predecessors, (2602), 520 states have call successors, (520), 180 states have call predecessors, (520), 178 states have return successors, (737), 510 states have call predecessors, (737), 509 states have call successors, (737) [2021-11-21 00:18:54,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2476 states to 2476 states and 3859 transitions. [2021-11-21 00:18:54,323 INFO L78 Accepts]: Start accepts. Automaton has 2476 states and 3859 transitions. Word has length 108 [2021-11-21 00:18:54,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:54,323 INFO L470 AbstractCegarLoop]: Abstraction has 2476 states and 3859 transitions. [2021-11-21 00:18:54,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-21 00:18:54,324 INFO L276 IsEmpty]: Start isEmpty. Operand 2476 states and 3859 transitions. [2021-11-21 00:18:54,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-21 00:18:54,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:54,328 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:54,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:54,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 00:18:54,542 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:54,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:54,542 INFO L85 PathProgramCache]: Analyzing trace with hash 643393737, now seen corresponding path program 1 times [2021-11-21 00:18:54,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:54,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235828782] [2021-11-21 00:18:54,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:54,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:54,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:54,644 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:18:54,644 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:54,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235828782] [2021-11-21 00:18:54,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235828782] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:54,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486903886] [2021-11-21 00:18:54,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:54,645 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:54,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:54,646 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:54,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:18:54,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:54,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 1378 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:18:54,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:55,123 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:18:55,123 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:55,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [486903886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:55,124 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:55,124 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2021-11-21 00:18:55,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523416354] [2021-11-21 00:18:55,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:55,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:18:55,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:55,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:18:55,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:18:55,127 INFO L87 Difference]: Start difference. First operand 2476 states and 3859 transitions. Second operand has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-21 00:18:56,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:56,150 INFO L93 Difference]: Finished difference Result 5527 states and 8868 transitions. [2021-11-21 00:18:56,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:18:56,151 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 109 [2021-11-21 00:18:56,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:56,180 INFO L225 Difference]: With dead ends: 5527 [2021-11-21 00:18:56,180 INFO L226 Difference]: Without dead ends: 3493 [2021-11-21 00:18:56,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:18:56,201 INFO L933 BasicCegarLoop]: 805 mSDtfsCounter, 682 mSDsluCounter, 1464 mSDsCounter, 0 mSdLazyCounter, 881 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 684 SdHoareTripleChecker+Valid, 2177 SdHoareTripleChecker+Invalid, 914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:56,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [684 Valid, 2177 Invalid, 914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 881 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 00:18:56,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3493 states. [2021-11-21 00:18:56,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3493 to 3444. [2021-11-21 00:18:56,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3444 states, 2471 states have (on average 1.462161068393363) internal successors, (3613), 2566 states have internal predecessors, (3613), 722 states have call successors, (722), 252 states have call predecessors, (722), 250 states have return successors, (1171), 710 states have call predecessors, (1171), 707 states have call successors, (1171) [2021-11-21 00:18:56,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3444 states to 3444 states and 5506 transitions. [2021-11-21 00:18:56,463 INFO L78 Accepts]: Start accepts. Automaton has 3444 states and 5506 transitions. Word has length 109 [2021-11-21 00:18:56,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:56,464 INFO L470 AbstractCegarLoop]: Abstraction has 3444 states and 5506 transitions. [2021-11-21 00:18:56,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-21 00:18:56,465 INFO L276 IsEmpty]: Start isEmpty. Operand 3444 states and 5506 transitions. [2021-11-21 00:18:56,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-21 00:18:56,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:56,470 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:56,505 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:56,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:56,695 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:56,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:56,696 INFO L85 PathProgramCache]: Analyzing trace with hash 1475066352, now seen corresponding path program 1 times [2021-11-21 00:18:56,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:56,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314227222] [2021-11-21 00:18:56,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:56,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:56,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:56,802 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:18:56,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:56,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314227222] [2021-11-21 00:18:56,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314227222] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:56,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918451116] [2021-11-21 00:18:56,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:56,803 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:56,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:56,804 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:56,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:18:57,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:57,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 1379 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:18:57,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:57,308 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:18:57,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:18:57,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918451116] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:18:57,309 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:18:57,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2021-11-21 00:18:57,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533721821] [2021-11-21 00:18:57,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:18:57,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:18:57,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:57,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:18:57,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:18:57,312 INFO L87 Difference]: Start difference. First operand 3444 states and 5506 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-21 00:18:58,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:58,276 INFO L93 Difference]: Finished difference Result 7369 states and 12029 transitions. [2021-11-21 00:18:58,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:18:58,277 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 110 [2021-11-21 00:18:58,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:58,315 INFO L225 Difference]: With dead ends: 7369 [2021-11-21 00:18:58,316 INFO L226 Difference]: Without dead ends: 4370 [2021-11-21 00:18:58,338 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:18:58,339 INFO L933 BasicCegarLoop]: 809 mSDtfsCounter, 703 mSDsluCounter, 1467 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 705 SdHoareTripleChecker+Valid, 2184 SdHoareTripleChecker+Invalid, 901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 872 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:58,339 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [705 Valid, 2184 Invalid, 901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 872 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 00:18:58,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4370 states. [2021-11-21 00:18:58,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4370 to 4237. [2021-11-21 00:18:58,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4237 states, 3011 states have (on average 1.4613085353703088) internal successors, (4400), 3130 states have internal predecessors, (4400), 913 states have call successors, (913), 317 states have call predecessors, (913), 312 states have return successors, (1586), 898 states have call predecessors, (1586), 895 states have call successors, (1586) [2021-11-21 00:18:58,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4237 states to 4237 states and 6899 transitions. [2021-11-21 00:18:58,644 INFO L78 Accepts]: Start accepts. Automaton has 4237 states and 6899 transitions. Word has length 110 [2021-11-21 00:18:58,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:58,645 INFO L470 AbstractCegarLoop]: Abstraction has 4237 states and 6899 transitions. [2021-11-21 00:18:58,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-21 00:18:58,645 INFO L276 IsEmpty]: Start isEmpty. Operand 4237 states and 6899 transitions. [2021-11-21 00:18:58,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-21 00:18:58,650 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:58,650 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:58,685 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:58,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:58,874 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:58,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:58,874 INFO L85 PathProgramCache]: Analyzing trace with hash -1934252364, now seen corresponding path program 1 times [2021-11-21 00:18:58,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:58,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226363834] [2021-11-21 00:18:58,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:58,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:58,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:58,970 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-21 00:18:58,971 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:58,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226363834] [2021-11-21 00:18:58,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226363834] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:58,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115572055] [2021-11-21 00:18:58,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:58,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:58,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:58,973 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:58,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:18:59,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:59,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 1377 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:18:59,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:59,515 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:18:59,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:59,894 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:18:59,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2115572055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:18:59,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2014233438] [2021-11-21 00:18:59,914 INFO L159 IcfgInterpreter]: Started Sifa with 91 locations of interest [2021-11-21 00:18:59,914 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:59,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:59,924 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:59,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:19:56,212 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 574 for LOIs [2021-11-21 00:21:55,373 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 455 for LOIs [2021-11-21 00:22:28,219 INFO L197 IcfgInterpreter]: Interpreting procedure isExecutiveFloorCalling with input of size 490 for LOIs [2021-11-21 00:22:51,607 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 471 for LOIs [2021-11-21 00:22:54,985 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentFloorID with input of size 490 for LOIs [2021-11-21 00:22:58,855 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 455 for LOIs [2021-11-21 00:23:17,614 INFO L197 IcfgInterpreter]: Interpreting procedure isTopFloor with input of size 451 for LOIs [2021-11-21 00:23:20,055 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 439 for LOIs [2021-11-21 00:23:21,784 INFO L197 IcfgInterpreter]: Interpreting procedure angelinaCall with input of size 542 for LOIs [2021-11-21 00:23:54,432 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 791 for LOIs [2021-11-21 00:24:14,329 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 641 for LOIs [2021-11-21 00:24:20,872 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:28,721 WARN L227 SmtUtils]: Spent 5.63s on a formula simplification. DAG size of input: 641 DAG size of output: 576 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:24:49,805 WARN L227 SmtUtils]: Spent 12.66s on a formula simplification. DAG size of input: 791 DAG size of output: 586 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:24:56,049 WARN L227 SmtUtils]: Spent 5.48s on a formula simplification that was a NOOP. DAG size: 599 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:25:40,310 WARN L227 SmtUtils]: Spent 9.11s on a formula simplification. DAG size of input: 473 DAG size of output: 468 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:27:10,134 WARN L227 SmtUtils]: Spent 18.78s on a formula simplification. DAG size of input: 679 DAG size of output: 640 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:27:17,506 WARN L227 SmtUtils]: Spent 6.31s on a formula simplification that was a NOOP. DAG size: 621 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:27:17,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2014233438] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:27:17,508 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:27:17,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [5, 6, 7] total 64 [2021-11-21 00:27:17,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745214915] [2021-11-21 00:27:17,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:27:17,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-21 00:27:17,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:27:17,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-21 00:27:17,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=3660, Unknown=0, NotChecked=0, Total=4032 [2021-11-21 00:27:17,513 INFO L87 Difference]: Start difference. First operand 4237 states and 6899 transitions. Second operand has 52 states, 37 states have (on average 1.6756756756756757) internal successors, (62), 33 states have internal predecessors, (62), 16 states have call successors, (19), 11 states have call predecessors, (19), 11 states have return successors, (17), 15 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-21 00:27:32,910 WARN L227 SmtUtils]: Spent 6.07s on a formula simplification. DAG size of input: 588 DAG size of output: 548 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:27:39,062 WARN L227 SmtUtils]: Spent 5.79s on a formula simplification. DAG size of input: 599 DAG size of output: 554 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:29:01,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:01,752 INFO L93 Difference]: Finished difference Result 8690 states and 14144 transitions. [2021-11-21 00:29:01,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-21 00:29:01,753 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 37 states have (on average 1.6756756756756757) internal successors, (62), 33 states have internal predecessors, (62), 16 states have call successors, (19), 11 states have call predecessors, (19), 11 states have return successors, (17), 15 states have call predecessors, (17), 15 states have call successors, (17) Word has length 111 [2021-11-21 00:29:01,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:01,799 INFO L225 Difference]: With dead ends: 8690 [2021-11-21 00:29:01,799 INFO L226 Difference]: Without dead ends: 4476 [2021-11-21 00:29:01,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 271 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1398 ImplicationChecksByTransitivity, 200.5s TimeCoverageRelationStatistics Valid=410, Invalid=4282, Unknown=0, NotChecked=0, Total=4692 [2021-11-21 00:29:01,834 INFO L933 BasicCegarLoop]: 673 mSDtfsCounter, 328 mSDsluCounter, 10634 mSDsCounter, 0 mSdLazyCounter, 15658 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 73.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 11099 SdHoareTripleChecker+Invalid, 15731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.3s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 15658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 79.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:01,835 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [355 Valid, 11099 Invalid, 15731 Unknown, 0 Unchecked, 0.3s Time], IncrementalHoareTripleChecker [73 Valid, 15658 Invalid, 0 Unknown, 0 Unchecked, 79.5s Time] [2021-11-21 00:29:01,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4476 states. [2021-11-21 00:29:02,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4476 to 4400. [2021-11-21 00:29:02,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4400 states, 3123 states have (on average 1.4534101825168109) internal successors, (4539), 3245 states have internal predecessors, (4539), 947 states have call successors, (947), 332 states have call predecessors, (947), 329 states have return successors, (1622), 931 states have call predecessors, (1622), 929 states have call successors, (1622) [2021-11-21 00:29:02,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4400 states to 4400 states and 7108 transitions. [2021-11-21 00:29:02,401 INFO L78 Accepts]: Start accepts. Automaton has 4400 states and 7108 transitions. Word has length 111 [2021-11-21 00:29:02,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:02,401 INFO L470 AbstractCegarLoop]: Abstraction has 4400 states and 7108 transitions. [2021-11-21 00:29:02,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 37 states have (on average 1.6756756756756757) internal successors, (62), 33 states have internal predecessors, (62), 16 states have call successors, (19), 11 states have call predecessors, (19), 11 states have return successors, (17), 15 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-21 00:29:02,402 INFO L276 IsEmpty]: Start isEmpty. Operand 4400 states and 7108 transitions. [2021-11-21 00:29:02,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-21 00:29:02,409 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:02,410 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:02,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:02,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 00:29:02,638 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:29:02,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:02,639 INFO L85 PathProgramCache]: Analyzing trace with hash -132441478, now seen corresponding path program 1 times [2021-11-21 00:29:02,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:02,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717614348] [2021-11-21 00:29:02,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:02,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:02,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:02,804 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-21 00:29:02,804 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:02,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717614348] [2021-11-21 00:29:02,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717614348] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:02,805 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:29:02,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-21 00:29:02,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95227779] [2021-11-21 00:29:02,805 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:02,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:29:02,806 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:02,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:29:02,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:29:02,807 INFO L87 Difference]: Start difference. First operand 4400 states and 7108 transitions. Second operand has 8 states, 8 states have (on average 8.5) internal successors, (68), 8 states have internal predecessors, (68), 5 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 5 states have call predecessors, (17), 5 states have call successors, (17) [2021-11-21 00:29:03,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:03,780 INFO L93 Difference]: Finished difference Result 8491 states and 13829 transitions. [2021-11-21 00:29:03,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:29:03,781 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.5) internal successors, (68), 8 states have internal predecessors, (68), 5 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 5 states have call predecessors, (17), 5 states have call successors, (17) Word has length 116 [2021-11-21 00:29:03,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:03,845 INFO L225 Difference]: With dead ends: 8491 [2021-11-21 00:29:03,845 INFO L226 Difference]: Without dead ends: 4479 [2021-11-21 00:29:03,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:29:03,882 INFO L933 BasicCegarLoop]: 900 mSDtfsCounter, 852 mSDsluCounter, 5073 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 862 SdHoareTripleChecker+Valid, 5728 SdHoareTripleChecker+Invalid, 535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:03,883 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [862 Valid, 5728 Invalid, 535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:29:03,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4479 states. [2021-11-21 00:29:04,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4479 to 4424. [2021-11-21 00:29:04,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4424 states, 3139 states have (on average 1.4510990761388978) internal successors, (4555), 3263 states have internal predecessors, (4555), 947 states have call successors, (947), 332 states have call predecessors, (947), 337 states have return successors, (1639), 937 states have call predecessors, (1639), 929 states have call successors, (1639) [2021-11-21 00:29:04,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4424 states to 4424 states and 7141 transitions. [2021-11-21 00:29:04,452 INFO L78 Accepts]: Start accepts. Automaton has 4424 states and 7141 transitions. Word has length 116 [2021-11-21 00:29:04,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:04,453 INFO L470 AbstractCegarLoop]: Abstraction has 4424 states and 7141 transitions. [2021-11-21 00:29:04,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 8.5) internal successors, (68), 8 states have internal predecessors, (68), 5 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 5 states have call predecessors, (17), 5 states have call successors, (17) [2021-11-21 00:29:04,453 INFO L276 IsEmpty]: Start isEmpty. Operand 4424 states and 7141 transitions. [2021-11-21 00:29:04,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-21 00:29:04,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:04,461 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:04,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-21 00:29:04,462 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:29:04,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:04,463 INFO L85 PathProgramCache]: Analyzing trace with hash 12687373, now seen corresponding path program 1 times [2021-11-21 00:29:04,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:04,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373046196] [2021-11-21 00:29:04,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:04,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:04,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:04,572 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 00:29:04,573 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:04,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373046196] [2021-11-21 00:29:04,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373046196] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:04,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1566998917] [2021-11-21 00:29:04,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:04,574 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:04,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:04,575 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:04,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:29:04,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:04,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 1401 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:29:04,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:05,249 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 00:29:05,250 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:29:05,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1566998917] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:05,250 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:29:05,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5] total 10 [2021-11-21 00:29:05,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300163566] [2021-11-21 00:29:05,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:05,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:29:05,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:05,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:29:05,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:29:05,252 INFO L87 Difference]: Start difference. First operand 4424 states and 7141 transitions. Second operand has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 6 states have internal predecessors, (71), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-21 00:29:06,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:06,229 INFO L93 Difference]: Finished difference Result 9460 states and 16173 transitions. [2021-11-21 00:29:06,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:29:06,230 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 6 states have internal predecessors, (71), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) Word has length 118 [2021-11-21 00:29:06,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:06,269 INFO L225 Difference]: With dead ends: 9460 [2021-11-21 00:29:06,269 INFO L226 Difference]: Without dead ends: 5445 [2021-11-21 00:29:06,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:29:06,314 INFO L933 BasicCegarLoop]: 754 mSDtfsCounter, 169 mSDsluCounter, 3751 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 4321 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:06,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 4321 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:29:06,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5445 states. [2021-11-21 00:29:06,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5445 to 5012. [2021-11-21 00:29:06,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5012 states, 3466 states have (on average 1.4460473167916907) internal successors, (5012), 3657 states have internal predecessors, (5012), 1189 states have call successors, (1189), 332 states have call predecessors, (1189), 356 states have return successors, (2062), 1191 states have call predecessors, (2062), 1171 states have call successors, (2062) [2021-11-21 00:29:06,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5012 states to 5012 states and 8263 transitions. [2021-11-21 00:29:06,883 INFO L78 Accepts]: Start accepts. Automaton has 5012 states and 8263 transitions. Word has length 118 [2021-11-21 00:29:06,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:06,884 INFO L470 AbstractCegarLoop]: Abstraction has 5012 states and 8263 transitions. [2021-11-21 00:29:06,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 6 states have internal predecessors, (71), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-21 00:29:06,884 INFO L276 IsEmpty]: Start isEmpty. Operand 5012 states and 8263 transitions. [2021-11-21 00:29:06,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 00:29:06,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:06,895 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:06,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:07,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:29:07,110 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:29:07,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:07,110 INFO L85 PathProgramCache]: Analyzing trace with hash 638732479, now seen corresponding path program 1 times [2021-11-21 00:29:07,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:07,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836365791] [2021-11-21 00:29:07,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:07,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:07,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:07,265 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 00:29:07,266 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:07,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836365791] [2021-11-21 00:29:07,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836365791] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:07,266 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:29:07,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-21 00:29:07,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717424833] [2021-11-21 00:29:07,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:07,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:29:07,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:07,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:29:07,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:29:07,269 INFO L87 Difference]: Start difference. First operand 5012 states and 8263 transitions. Second operand has 8 states, 8 states have (on average 8.75) internal successors, (70), 6 states have internal predecessors, (70), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 4 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-21 00:29:08,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:08,061 INFO L93 Difference]: Finished difference Result 9598 states and 16890 transitions. [2021-11-21 00:29:08,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:29:08,062 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.75) internal successors, (70), 6 states have internal predecessors, (70), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 4 states have call predecessors, (18), 2 states have call successors, (18) Word has length 121 [2021-11-21 00:29:08,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:08,108 INFO L225 Difference]: With dead ends: 9598 [2021-11-21 00:29:08,109 INFO L226 Difference]: Without dead ends: 5193 [2021-11-21 00:29:08,160 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:29:08,162 INFO L933 BasicCegarLoop]: 679 mSDtfsCounter, 33 mSDsluCounter, 4222 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 4678 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:08,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 4678 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:29:08,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5193 states. [2021-11-21 00:29:08,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5193 to 5089. [2021-11-21 00:29:08,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5089 states, 3525 states have (on average 1.438581560283688) internal successors, (5071), 3715 states have internal predecessors, (5071), 1189 states have call successors, (1189), 332 states have call predecessors, (1189), 374 states have return successors, (2143), 1210 states have call predecessors, (2143), 1171 states have call successors, (2143) [2021-11-21 00:29:08,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5089 states to 5089 states and 8403 transitions. [2021-11-21 00:29:08,857 INFO L78 Accepts]: Start accepts. Automaton has 5089 states and 8403 transitions. Word has length 121 [2021-11-21 00:29:08,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:08,859 INFO L470 AbstractCegarLoop]: Abstraction has 5089 states and 8403 transitions. [2021-11-21 00:29:08,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 8.75) internal successors, (70), 6 states have internal predecessors, (70), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 4 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-21 00:29:08,859 INFO L276 IsEmpty]: Start isEmpty. Operand 5089 states and 8403 transitions. [2021-11-21 00:29:08,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 00:29:08,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:08,869 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:08,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-21 00:29:08,869 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:29:08,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:08,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1013581980, now seen corresponding path program 1 times [2021-11-21 00:29:08,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:08,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110858074] [2021-11-21 00:29:08,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:08,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:08,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:09,026 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 00:29:09,027 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:09,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110858074] [2021-11-21 00:29:09,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110858074] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:09,028 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:29:09,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-21 00:29:09,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122480749] [2021-11-21 00:29:09,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:09,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:29:09,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:09,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:29:09,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:29:09,032 INFO L87 Difference]: Start difference. First operand 5089 states and 8403 transitions. Second operand has 8 states, 8 states have (on average 8.625) internal successors, (69), 6 states have internal predecessors, (69), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 4 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-21 00:29:09,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:09,841 INFO L93 Difference]: Finished difference Result 9716 states and 17086 transitions. [2021-11-21 00:29:09,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:29:09,842 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.625) internal successors, (69), 6 states have internal predecessors, (69), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 4 states have call predecessors, (18), 2 states have call successors, (18) Word has length 120 [2021-11-21 00:29:09,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:09,880 INFO L225 Difference]: With dead ends: 9716 [2021-11-21 00:29:09,880 INFO L226 Difference]: Without dead ends: 5256 [2021-11-21 00:29:09,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:29:09,961 INFO L933 BasicCegarLoop]: 674 mSDtfsCounter, 34 mSDsluCounter, 4200 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 4651 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:09,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 4651 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:29:09,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5256 states. [2021-11-21 00:29:10,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5256 to 5097. [2021-11-21 00:29:10,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5097 states, 3533 states have (on average 1.4375884517407302) internal successors, (5079), 3715 states have internal predecessors, (5079), 1189 states have call successors, (1189), 332 states have call predecessors, (1189), 374 states have return successors, (2143), 1218 states have call predecessors, (2143), 1171 states have call successors, (2143) [2021-11-21 00:29:10,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5097 states to 5097 states and 8411 transitions. [2021-11-21 00:29:10,670 INFO L78 Accepts]: Start accepts. Automaton has 5097 states and 8411 transitions. Word has length 120 [2021-11-21 00:29:10,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:10,672 INFO L470 AbstractCegarLoop]: Abstraction has 5097 states and 8411 transitions. [2021-11-21 00:29:10,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 8.625) internal successors, (69), 6 states have internal predecessors, (69), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 4 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-21 00:29:10,672 INFO L276 IsEmpty]: Start isEmpty. Operand 5097 states and 8411 transitions. [2021-11-21 00:29:10,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 00:29:10,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:10,680 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:10,680 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-21 00:29:10,681 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:29:10,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:10,682 INFO L85 PathProgramCache]: Analyzing trace with hash 350803327, now seen corresponding path program 1 times [2021-11-21 00:29:10,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:10,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970683863] [2021-11-21 00:29:10,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:10,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:10,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:10,819 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 00:29:10,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:10,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970683863] [2021-11-21 00:29:10,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970683863] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:10,820 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:29:10,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-21 00:29:10,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579950173] [2021-11-21 00:29:10,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:10,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:29:10,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:10,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:29:10,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:29:10,823 INFO L87 Difference]: Start difference. First operand 5097 states and 8411 transitions. Second operand has 8 states, 8 states have (on average 8.75) internal successors, (70), 6 states have internal predecessors, (70), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 4 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-21 00:29:11,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:11,503 INFO L93 Difference]: Finished difference Result 9726 states and 17096 transitions. [2021-11-21 00:29:11,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:29:11,503 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.75) internal successors, (70), 6 states have internal predecessors, (70), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 4 states have call predecessors, (18), 2 states have call successors, (18) Word has length 121 [2021-11-21 00:29:11,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:11,544 INFO L225 Difference]: With dead ends: 9726 [2021-11-21 00:29:11,545 INFO L226 Difference]: Without dead ends: 5261 [2021-11-21 00:29:11,589 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:29:11,590 INFO L933 BasicCegarLoop]: 679 mSDtfsCounter, 33 mSDsluCounter, 4222 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 4678 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:11,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 4678 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:29:11,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5261 states. [2021-11-21 00:29:12,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5261 to 5102. [2021-11-21 00:29:12,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5102 states, 3538 states have (on average 1.4369700395703788) internal successors, (5084), 3712 states have internal predecessors, (5084), 1189 states have call successors, (1189), 332 states have call predecessors, (1189), 374 states have return successors, (2143), 1226 states have call predecessors, (2143), 1171 states have call successors, (2143) [2021-11-21 00:29:12,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5102 states to 5102 states and 8416 transitions. [2021-11-21 00:29:12,242 INFO L78 Accepts]: Start accepts. Automaton has 5102 states and 8416 transitions. Word has length 121 [2021-11-21 00:29:12,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:12,243 INFO L470 AbstractCegarLoop]: Abstraction has 5102 states and 8416 transitions. [2021-11-21 00:29:12,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 8.75) internal successors, (70), 6 states have internal predecessors, (70), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 4 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-21 00:29:12,243 INFO L276 IsEmpty]: Start isEmpty. Operand 5102 states and 8416 transitions. [2021-11-21 00:29:12,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 00:29:12,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:12,252 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:12,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-21 00:29:12,252 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:29:12,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:12,253 INFO L85 PathProgramCache]: Analyzing trace with hash 1517300027, now seen corresponding path program 1 times [2021-11-21 00:29:12,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:12,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127130558] [2021-11-21 00:29:12,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:12,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:12,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:12,371 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-21 00:29:12,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:12,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127130558] [2021-11-21 00:29:12,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [127130558] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:12,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600617711] [2021-11-21 00:29:12,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:12,372 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:12,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:12,378 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:12,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9727d38d-5975-40e8-8838-0130f55d973e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:29:12,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:12,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 1407 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:29:12,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:12,941 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:29:12,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:13,365 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:29:13,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600617711] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:13,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [884483270] [2021-11-21 00:29:13,371 INFO L159 IcfgInterpreter]: Started Sifa with 100 locations of interest [2021-11-21 00:29:13,371 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:13,372 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:13,372 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:13,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:30:40,903 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 574 for LOIs