./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 22315e954f625a92454f179210263631b555d33fa4f07d11e85c64617a347172 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:48:45,343 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:48:45,346 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:48:45,400 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:48:45,401 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:48:45,406 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:48:45,407 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:48:45,412 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:48:45,414 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:48:45,420 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:48:45,422 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:48:45,424 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:48:45,424 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:48:45,427 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:48:45,429 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:48:45,433 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:48:45,435 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:48:45,436 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:48:45,442 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:48:45,450 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:48:45,453 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:48:45,454 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:48:45,457 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:48:45,459 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:48:45,468 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:48:45,468 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:48:45,469 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:48:45,471 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:48:45,471 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:48:45,473 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:48:45,474 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:48:45,475 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:48:45,477 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:48:45,478 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:48:45,480 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:48:45,480 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:48:45,481 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:48:45,481 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:48:45,481 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:48:45,482 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:48:45,483 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:48:45,484 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:48:45,524 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:48:45,525 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:48:45,525 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:48:45,525 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:48:45,526 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:48:45,527 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:48:45,527 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:48:45,527 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:48:45,527 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:48:45,527 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:48:45,528 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:48:45,529 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:48:45,529 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:48:45,529 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:48:45,529 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:48:45,529 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:48:45,530 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:48:45,530 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:48:45,531 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:48:45,531 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:48:45,531 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:48:45,531 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:48:45,531 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:48:45,532 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:48:45,532 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:48:45,532 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:48:45,532 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:48:45,532 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:48:45,533 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:48:45,533 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:48:45,533 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:48:45,533 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:48:45,534 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:48:45,534 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:48:45,534 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:48:45,534 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:48:45,534 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:48:45,535 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:48:45,535 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:48:45,535 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:48:45,535 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:48:45,535 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_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 22315e954f625a92454f179210263631b555d33fa4f07d11e85c64617a347172 [2021-11-23 03:48:45,815 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:48:45,837 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:48:45,840 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:48:45,841 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:48:45,842 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:48:45,843 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c [2021-11-23 03:48:45,939 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/data/cb7540d10/6702f78aff0540b5a838af7f5082fa75/FLAG6cd724949 [2021-11-23 03:48:47,057 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:48:47,058 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c [2021-11-23 03:48:47,138 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/data/cb7540d10/6702f78aff0540b5a838af7f5082fa75/FLAG6cd724949 [2021-11-23 03:48:47,268 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/data/cb7540d10/6702f78aff0540b5a838af7f5082fa75 [2021-11-23 03:48:47,271 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:48:47,274 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:48:47,278 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:48:47,278 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:48:47,282 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:48:47,283 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:48:47" (1/1) ... [2021-11-23 03:48:47,284 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6166de76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:47, skipping insertion in model container [2021-11-23 03:48:47,285 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:48:47" (1/1) ... [2021-11-23 03:48:47,293 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:48:47,574 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:48:50,164 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_25a7b630-9492-443f-b559-182e86b7908b/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c[380593,380606] [2021-11-23 03:48:50,200 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_25a7b630-9492-443f-b559-182e86b7908b/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c[383339,383352] [2021-11-23 03:48:50,445 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:48:50,456 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:48:51,710 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_25a7b630-9492-443f-b559-182e86b7908b/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c[380593,380606] [2021-11-23 03:48:51,717 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_25a7b630-9492-443f-b559-182e86b7908b/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c[383339,383352] [2021-11-23 03:48:51,745 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:48:51,826 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:48:51,827 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51 WrapperNode [2021-11-23 03:48:51,827 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:48:51,828 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:48:51,828 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:48:51,829 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:48:51,836 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (1/1) ... [2021-11-23 03:48:51,939 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (1/1) ... [2021-11-23 03:48:52,362 INFO L137 Inliner]: procedures = 54, calls = 57, calls flagged for inlining = 31, calls inlined = 31, statements flattened = 12798 [2021-11-23 03:48:52,363 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:48:52,364 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:48:52,364 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:48:52,364 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:48:52,374 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (1/1) ... [2021-11-23 03:48:52,374 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (1/1) ... [2021-11-23 03:48:52,438 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (1/1) ... [2021-11-23 03:48:52,438 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (1/1) ... [2021-11-23 03:48:52,752 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (1/1) ... [2021-11-23 03:48:52,824 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (1/1) ... [2021-11-23 03:48:52,852 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (1/1) ... [2021-11-23 03:48:53,025 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:48:53,040 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:48:53,040 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:48:53,041 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:48:53,042 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (1/1) ... [2021-11-23 03:48:53,049 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:48:53,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:48:53,109 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:48:53,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:48:53,222 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:48:53,222 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-23 03:48:53,222 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-23 03:48:53,222 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 03:48:53,223 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 03:48:53,223 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-23 03:48:53,223 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-23 03:48:53,223 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-23 03:48:53,223 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-23 03:48:53,223 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-23 03:48:53,224 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-23 03:48:53,224 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-23 03:48:53,224 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-23 03:48:53,224 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-23 03:48:53,224 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-23 03:48:53,224 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:48:53,225 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:48:53,225 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:48:53,445 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:48:53,447 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:49:01,016 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:49:03,645 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:49:03,646 INFO L301 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-23 03:49:03,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:49:03 BoogieIcfgContainer [2021-11-23 03:49:03,652 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:49:03,654 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:49:03,654 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:49:03,657 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:49:03,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:48:47" (1/3) ... [2021-11-23 03:49:03,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15d83118 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:49:03, skipping insertion in model container [2021-11-23 03:49:03,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:48:51" (2/3) ... [2021-11-23 03:49:03,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15d83118 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:49:03, skipping insertion in model container [2021-11-23 03:49:03,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:49:03" (3/3) ... [2021-11-23 03:49:03,661 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.05.cil-2.c [2021-11-23 03:49:03,666 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:49:03,667 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 03:49:03,726 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:49:03,733 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:49:03,733 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 03:49:03,795 INFO L276 IsEmpty]: Start isEmpty. Operand has 1760 states, 1729 states have (on average 1.9705031810294968) internal successors, (3407), 1734 states have internal predecessors, (3407), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-23 03:49:03,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:49:03,809 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:49:03,810 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:49:03,811 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:49:03,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:49:03,821 INFO L85 PathProgramCache]: Analyzing trace with hash 151883147, now seen corresponding path program 1 times [2021-11-23 03:49:03,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:49:03,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638080911] [2021-11-23 03:49:03,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:03,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:49:04,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:04,153 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:49:04,154 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:49:04,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638080911] [2021-11-23 03:49:04,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638080911] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:49:04,155 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:49:04,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:49:04,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695993600] [2021-11-23 03:49:04,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:49:04,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:49:04,163 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:49:04,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:49:04,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:49:04,197 INFO L87 Difference]: Start difference. First operand has 1760 states, 1729 states have (on average 1.9705031810294968) internal successors, (3407), 1734 states have internal predecessors, (3407), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:49:05,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:49:05,020 INFO L93 Difference]: Finished difference Result 3613 states and 7055 transitions. [2021-11-23 03:49:05,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:49:05,023 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 47 [2021-11-23 03:49:05,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:49:05,058 INFO L225 Difference]: With dead ends: 3613 [2021-11-23 03:49:05,059 INFO L226 Difference]: Without dead ends: 1852 [2021-11-23 03:49:05,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:49:05,080 INFO L933 BasicCegarLoop]: 3308 mSDtfsCounter, 3556 mSDsluCounter, 3503 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3556 SdHoareTripleChecker+Valid, 6544 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:49:05,082 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3556 Valid, 6544 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 618 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:49:05,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1852 states. [2021-11-23 03:49:05,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1852 to 1851. [2021-11-23 03:49:05,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1851 states, 1801 states have (on average 1.9444752915047196) internal successors, (3502), 1805 states have internal predecessors, (3502), 36 states have call successors, (36), 13 states have call predecessors, (36), 12 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 03:49:05,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1851 states to 1851 states and 3572 transitions. [2021-11-23 03:49:05,248 INFO L78 Accepts]: Start accepts. Automaton has 1851 states and 3572 transitions. Word has length 47 [2021-11-23 03:49:05,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:49:05,249 INFO L470 AbstractCegarLoop]: Abstraction has 1851 states and 3572 transitions. [2021-11-23 03:49:05,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:49:05,250 INFO L276 IsEmpty]: Start isEmpty. Operand 1851 states and 3572 transitions. [2021-11-23 03:49:05,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:49:05,256 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:49:05,256 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:49:05,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:49:05,257 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:49:05,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:49:05,258 INFO L85 PathProgramCache]: Analyzing trace with hash -1724696445, now seen corresponding path program 1 times [2021-11-23 03:49:05,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:49:05,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518944172] [2021-11-23 03:49:05,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:05,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:49:05,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:05,378 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:49:05,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:49:05,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518944172] [2021-11-23 03:49:05,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518944172] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:49:05,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861787164] [2021-11-23 03:49:05,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:05,385 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:49:05,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:49:05,396 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:49:05,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:49:05,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:05,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:49:05,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:49:05,767 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:49:05,767 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:49:05,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861787164] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:49:05,773 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:49:05,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:49:05,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908553834] [2021-11-23 03:49:05,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:49:05,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:49:05,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:49:05,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:49:05,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:49:05,782 INFO L87 Difference]: Start difference. First operand 1851 states and 3572 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:49:06,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:49:06,309 INFO L93 Difference]: Finished difference Result 2254 states and 4169 transitions. [2021-11-23 03:49:06,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:49:06,309 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 88 [2021-11-23 03:49:06,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:49:06,326 INFO L225 Difference]: With dead ends: 2254 [2021-11-23 03:49:06,326 INFO L226 Difference]: Without dead ends: 2049 [2021-11-23 03:49:06,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:49:06,343 INFO L933 BasicCegarLoop]: 3238 mSDtfsCounter, 3410 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3410 SdHoareTripleChecker+Valid, 3365 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:49:06,344 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3410 Valid, 3365 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:49:06,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2049 states. [2021-11-23 03:49:06,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2049 to 2043. [2021-11-23 03:49:06,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2043 states, 1953 states have (on average 1.905273937532002) internal successors, (3721), 1958 states have internal predecessors, (3721), 64 states have call successors, (64), 25 states have call predecessors, (64), 24 states have return successors, (62), 60 states have call predecessors, (62), 62 states have call successors, (62) [2021-11-23 03:49:06,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2043 states to 2043 states and 3847 transitions. [2021-11-23 03:49:06,449 INFO L78 Accepts]: Start accepts. Automaton has 2043 states and 3847 transitions. Word has length 88 [2021-11-23 03:49:06,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:49:06,450 INFO L470 AbstractCegarLoop]: Abstraction has 2043 states and 3847 transitions. [2021-11-23 03:49:06,451 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:49:06,451 INFO L276 IsEmpty]: Start isEmpty. Operand 2043 states and 3847 transitions. [2021-11-23 03:49:06,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:49:06,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:49:06,459 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:49:06,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:49:06,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:49:06,676 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:49:06,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:49:06,676 INFO L85 PathProgramCache]: Analyzing trace with hash 1666398725, now seen corresponding path program 1 times [2021-11-23 03:49:06,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:49:06,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156214446] [2021-11-23 03:49:06,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:06,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:49:06,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:06,767 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:49:06,767 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:49:06,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156214446] [2021-11-23 03:49:06,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156214446] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:49:06,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231023397] [2021-11-23 03:49:06,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:06,768 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:49:06,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:49:06,769 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:49:06,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:49:06,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:06,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:49:06,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:49:07,063 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 03:49:07,063 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:49:07,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231023397] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:49:07,063 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:49:07,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:49:07,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85166304] [2021-11-23 03:49:07,064 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:49:07,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:49:07,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:49:07,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:49:07,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:49:07,065 INFO L87 Difference]: Start difference. First operand 2043 states and 3847 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:49:07,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:49:07,655 INFO L93 Difference]: Finished difference Result 2824 states and 4998 transitions. [2021-11-23 03:49:07,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:49:07,656 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 88 [2021-11-23 03:49:07,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:49:07,675 INFO L225 Difference]: With dead ends: 2824 [2021-11-23 03:49:07,675 INFO L226 Difference]: Without dead ends: 2427 [2021-11-23 03:49:07,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:49:07,679 INFO L933 BasicCegarLoop]: 3237 mSDtfsCounter, 3407 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3407 SdHoareTripleChecker+Valid, 3364 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:49:07,680 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3407 Valid, 3364 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:49:07,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2427 states. [2021-11-23 03:49:07,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2427 to 2419. [2021-11-23 03:49:07,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2419 states, 2251 states have (on average 1.842292314526877) internal successors, (4147), 2258 states have internal predecessors, (4147), 118 states have call successors, (118), 49 states have call predecessors, (118), 48 states have return successors, (116), 112 states have call predecessors, (116), 116 states have call successors, (116) [2021-11-23 03:49:07,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2419 states to 2419 states and 4381 transitions. [2021-11-23 03:49:07,796 INFO L78 Accepts]: Start accepts. Automaton has 2419 states and 4381 transitions. Word has length 88 [2021-11-23 03:49:07,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:49:07,797 INFO L470 AbstractCegarLoop]: Abstraction has 2419 states and 4381 transitions. [2021-11-23 03:49:07,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:49:07,797 INFO L276 IsEmpty]: Start isEmpty. Operand 2419 states and 4381 transitions. [2021-11-23 03:49:07,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:49:07,801 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:49:07,802 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:49:07,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:49:08,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:49:08,016 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:49:08,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:49:08,016 INFO L85 PathProgramCache]: Analyzing trace with hash 128219075, now seen corresponding path program 1 times [2021-11-23 03:49:08,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:49:08,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412025466] [2021-11-23 03:49:08,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:08,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:49:08,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:08,213 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:49:08,213 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:49:08,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412025466] [2021-11-23 03:49:08,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1412025466] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:49:08,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882943027] [2021-11-23 03:49:08,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:08,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:49:08,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:49:08,223 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:49:08,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:49:08,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:08,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:49:08,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:49:08,546 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:49:08,546 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:49:08,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882943027] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:49:08,547 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:49:08,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:49:08,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44690509] [2021-11-23 03:49:08,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:49:08,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:49:08,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:49:08,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:49:08,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:49:08,552 INFO L87 Difference]: Start difference. First operand 2419 states and 4381 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:49:09,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:49:09,063 INFO L93 Difference]: Finished difference Result 3940 states and 6606 transitions. [2021-11-23 03:49:09,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:49:09,064 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 88 [2021-11-23 03:49:09,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:49:09,090 INFO L225 Difference]: With dead ends: 3940 [2021-11-23 03:49:09,090 INFO L226 Difference]: Without dead ends: 3167 [2021-11-23 03:49:09,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:49:09,099 INFO L933 BasicCegarLoop]: 3205 mSDtfsCounter, 3401 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3401 SdHoareTripleChecker+Valid, 3332 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:49:09,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3401 Valid, 3332 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:49:09,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3167 states. [2021-11-23 03:49:09,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3167 to 3155. [2021-11-23 03:49:09,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3155 states, 2835 states have (on average 1.7548500881834215) internal successors, (4975), 2846 states have internal predecessors, (4975), 222 states have call successors, (222), 97 states have call predecessors, (222), 96 states have return successors, (220), 212 states have call predecessors, (220), 220 states have call successors, (220) [2021-11-23 03:49:09,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3155 states to 3155 states and 5417 transitions. [2021-11-23 03:49:09,290 INFO L78 Accepts]: Start accepts. Automaton has 3155 states and 5417 transitions. Word has length 88 [2021-11-23 03:49:09,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:49:09,290 INFO L470 AbstractCegarLoop]: Abstraction has 3155 states and 5417 transitions. [2021-11-23 03:49:09,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:49:09,291 INFO L276 IsEmpty]: Start isEmpty. Operand 3155 states and 5417 transitions. [2021-11-23 03:49:09,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:49:09,297 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:49:09,297 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:49:09,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:49:09,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:49:09,512 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:49:09,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:49:09,512 INFO L85 PathProgramCache]: Analyzing trace with hash -1708237823, now seen corresponding path program 1 times [2021-11-23 03:49:09,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:49:09,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681772058] [2021-11-23 03:49:09,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:09,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:49:09,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:09,681 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 03:49:09,681 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:49:09,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681772058] [2021-11-23 03:49:09,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681772058] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:49:09,682 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:49:09,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:49:09,683 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400302914] [2021-11-23 03:49:09,683 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:49:09,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:49:09,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:49:09,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:49:09,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:49:09,685 INFO L87 Difference]: Start difference. First operand 3155 states and 5417 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:49:10,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:49:10,268 INFO L93 Difference]: Finished difference Result 4335 states and 7148 transitions. [2021-11-23 03:49:10,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:49:10,269 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 88 [2021-11-23 03:49:10,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:49:10,297 INFO L225 Difference]: With dead ends: 4335 [2021-11-23 03:49:10,297 INFO L226 Difference]: Without dead ends: 3547 [2021-11-23 03:49:10,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:49:10,305 INFO L933 BasicCegarLoop]: 3259 mSDtfsCounter, 64 mSDsluCounter, 3433 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 6456 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:49:10,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 6456 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 498 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:49:10,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3547 states. [2021-11-23 03:49:10,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3547 to 3399. [2021-11-23 03:49:10,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3399 states, 3063 states have (on average 1.7495919033627163) internal successors, (5359), 3074 states have internal predecessors, (5359), 230 states have call successors, (230), 105 states have call predecessors, (230), 104 states have return successors, (228), 220 states have call predecessors, (228), 228 states have call successors, (228) [2021-11-23 03:49:10,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3399 states to 3399 states and 5817 transitions. [2021-11-23 03:49:10,480 INFO L78 Accepts]: Start accepts. Automaton has 3399 states and 5817 transitions. Word has length 88 [2021-11-23 03:49:10,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:49:10,483 INFO L470 AbstractCegarLoop]: Abstraction has 3399 states and 5817 transitions. [2021-11-23 03:49:10,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:49:10,484 INFO L276 IsEmpty]: Start isEmpty. Operand 3399 states and 5817 transitions. [2021-11-23 03:49:10,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 03:49:10,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:49:10,495 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:49:10,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:49:10,495 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:49:10,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:49:10,497 INFO L85 PathProgramCache]: Analyzing trace with hash -1578454786, now seen corresponding path program 1 times [2021-11-23 03:49:10,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:49:10,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48605033] [2021-11-23 03:49:10,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:10,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:49:10,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:10,626 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-23 03:49:10,627 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:49:10,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48605033] [2021-11-23 03:49:10,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48605033] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:49:10,627 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:49:10,628 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:49:10,628 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781985443] [2021-11-23 03:49:10,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:49:10,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:49:10,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:49:10,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:49:10,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:49:10,630 INFO L87 Difference]: Start difference. First operand 3399 states and 5817 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:49:11,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:49:11,188 INFO L93 Difference]: Finished difference Result 6832 states and 10874 transitions. [2021-11-23 03:49:11,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:49:11,189 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 117 [2021-11-23 03:49:11,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:49:11,226 INFO L225 Difference]: With dead ends: 6832 [2021-11-23 03:49:11,226 INFO L226 Difference]: Without dead ends: 5079 [2021-11-23 03:49:11,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:49:11,237 INFO L933 BasicCegarLoop]: 3207 mSDtfsCounter, 3401 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3401 SdHoareTripleChecker+Valid, 3334 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:49:11,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3401 Valid, 3334 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:49:11,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5079 states. [2021-11-23 03:49:11,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5079 to 5051. [2021-11-23 03:49:11,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5051 states, 4403 states have (on average 1.6550079491255962) internal successors, (7287), 4422 states have internal predecessors, (7287), 438 states have call successors, (438), 209 states have call predecessors, (438), 208 states have return successors, (436), 420 states have call predecessors, (436), 436 states have call successors, (436) [2021-11-23 03:49:11,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5051 states to 5051 states and 8161 transitions. [2021-11-23 03:49:11,523 INFO L78 Accepts]: Start accepts. Automaton has 5051 states and 8161 transitions. Word has length 117 [2021-11-23 03:49:11,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:49:11,524 INFO L470 AbstractCegarLoop]: Abstraction has 5051 states and 8161 transitions. [2021-11-23 03:49:11,525 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:49:11,526 INFO L276 IsEmpty]: Start isEmpty. Operand 5051 states and 8161 transitions. [2021-11-23 03:49:11,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 03:49:11,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:49:11,540 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:49:11,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:49:11,541 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:49:11,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:49:11,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1106779769, now seen corresponding path program 1 times [2021-11-23 03:49:11,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:49:11,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30482575] [2021-11-23 03:49:11,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:11,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:49:11,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:11,732 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-23 03:49:11,732 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:49:11,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30482575] [2021-11-23 03:49:11,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30482575] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:49:11,733 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:49:11,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:49:11,734 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747767737] [2021-11-23 03:49:11,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:49:11,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:49:11,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:49:11,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:49:11,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:49:11,735 INFO L87 Difference]: Start difference. First operand 5051 states and 8161 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:49:12,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:49:12,404 INFO L93 Difference]: Finished difference Result 11716 states and 17866 transitions. [2021-11-23 03:49:12,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:49:12,405 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 117 [2021-11-23 03:49:12,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:49:12,463 INFO L225 Difference]: With dead ends: 11716 [2021-11-23 03:49:12,463 INFO L226 Difference]: Without dead ends: 8311 [2021-11-23 03:49:12,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:49:12,480 INFO L933 BasicCegarLoop]: 3228 mSDtfsCounter, 3404 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3404 SdHoareTripleChecker+Valid, 3355 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:49:12,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3404 Valid, 3355 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:49:12,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8311 states. [2021-11-23 03:49:12,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8311 to 8259. [2021-11-23 03:49:12,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8259 states, 7003 states have (on average 1.5683278594887906) internal successors, (10983), 7038 states have internal predecessors, (10983), 838 states have call successors, (838), 417 states have call predecessors, (838), 416 states have return successors, (836), 804 states have call predecessors, (836), 836 states have call successors, (836) [2021-11-23 03:49:12,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8259 states to 8259 states and 12657 transitions. [2021-11-23 03:49:12,882 INFO L78 Accepts]: Start accepts. Automaton has 8259 states and 12657 transitions. Word has length 117 [2021-11-23 03:49:12,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:49:12,883 INFO L470 AbstractCegarLoop]: Abstraction has 8259 states and 12657 transitions. [2021-11-23 03:49:12,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:49:12,883 INFO L276 IsEmpty]: Start isEmpty. Operand 8259 states and 12657 transitions. [2021-11-23 03:49:12,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:49:12,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:49:12,911 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:49:12,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:49:12,911 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:49:12,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:49:12,912 INFO L85 PathProgramCache]: Analyzing trace with hash -584797484, now seen corresponding path program 1 times [2021-11-23 03:49:12,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:49:12,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740098823] [2021-11-23 03:49:12,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:12,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:49:12,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:12,987 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-23 03:49:12,987 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:49:12,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740098823] [2021-11-23 03:49:12,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740098823] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:49:12,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93865038] [2021-11-23 03:49:12,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:12,988 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:49:12,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:49:12,989 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:49:13,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:49:13,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:13,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 742 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:49:13,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:49:13,495 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 03:49:13,495 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:49:13,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93865038] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:49:13,495 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:49:13,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:49:13,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43328249] [2021-11-23 03:49:13,496 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:49:13,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:49:13,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:49:13,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:49:13,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:49:13,498 INFO L87 Difference]: Start difference. First operand 8259 states and 12657 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:49:14,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:49:14,296 INFO L93 Difference]: Finished difference Result 14155 states and 21223 transitions. [2021-11-23 03:49:14,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:49:14,297 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2021-11-23 03:49:14,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:49:14,351 INFO L225 Difference]: With dead ends: 14155 [2021-11-23 03:49:14,351 INFO L226 Difference]: Without dead ends: 10775 [2021-11-23 03:49:14,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:49:14,367 INFO L933 BasicCegarLoop]: 3283 mSDtfsCounter, 103 mSDsluCounter, 3434 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 6482 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:49:14,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 6482 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:49:14,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10775 states. [2021-11-23 03:49:14,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10775 to 9491. [2021-11-23 03:49:14,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9491 states, 8139 states have (on average 1.5794323626981202) internal successors, (12855), 8174 states have internal predecessors, (12855), 886 states have call successors, (886), 465 states have call predecessors, (886), 464 states have return successors, (884), 852 states have call predecessors, (884), 884 states have call successors, (884) [2021-11-23 03:49:14,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9491 states to 9491 states and 14625 transitions. [2021-11-23 03:49:14,913 INFO L78 Accepts]: Start accepts. Automaton has 9491 states and 14625 transitions. Word has length 135 [2021-11-23 03:49:14,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:49:14,915 INFO L470 AbstractCegarLoop]: Abstraction has 9491 states and 14625 transitions. [2021-11-23 03:49:14,915 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:49:14,915 INFO L276 IsEmpty]: Start isEmpty. Operand 9491 states and 14625 transitions. [2021-11-23 03:49:14,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:49:14,946 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:49:14,947 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:49:14,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:49:15,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:49:15,164 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:49:15,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:49:15,164 INFO L85 PathProgramCache]: Analyzing trace with hash 606227871, now seen corresponding path program 2 times [2021-11-23 03:49:15,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:49:15,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83854548] [2021-11-23 03:49:15,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:49:15,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:49:15,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:49:15,265 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 03:49:15,265 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:49:15,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83854548] [2021-11-23 03:49:15,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83854548] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:49:15,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865374997] [2021-11-23 03:49:15,266 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:49:15,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:49:15,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:49:15,267 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:49:15,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25a7b630-9492-443f-b559-182e86b7908b/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:49:15,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:49:15,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:49:15,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 03:49:15,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:49:15,826 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 62 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 03:49:15,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:49:16,501 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 19 proven. 40 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 03:49:16,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865374997] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:49:16,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1567011436] [2021-11-23 03:49:16,524 INFO L159 IcfgInterpreter]: Started Sifa with 71 locations of interest [2021-11-23 03:49:16,524 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:49:16,529 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:49:16,534 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:49:16,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:49:33,526 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 78 for LOIs [2021-11-23 03:49:33,552 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 157 for LOIs [2021-11-23 03:49:33,632 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 12 [2021-11-23 03:49:40,881 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 12