./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.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_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/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_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/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_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/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 48263e5b2fdfa125a212d9dd2b1aa7b4bc28734093ef4904b2507084a0cf2933 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:46:06,928 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:46:06,930 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:46:06,964 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:46:06,965 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:46:06,966 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:46:06,968 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:46:06,970 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:46:06,973 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:46:06,974 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:46:06,975 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:46:06,977 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:46:06,977 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:46:06,979 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:46:06,981 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:46:06,983 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:46:06,984 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:46:06,985 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:46:06,987 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:46:06,990 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:46:06,992 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:46:06,994 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:46:06,995 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:46:06,996 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:46:07,000 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:46:07,001 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:46:07,001 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:46:07,002 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:46:07,003 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:46:07,004 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:46:07,005 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:46:07,006 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:46:07,007 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:46:07,008 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:46:07,009 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:46:07,010 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:46:07,011 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:46:07,011 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:46:07,012 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:46:07,013 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:46:07,014 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:46:07,015 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:46:07,048 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:46:07,049 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:46:07,050 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:46:07,050 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:46:07,058 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:46:07,058 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:46:07,059 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:46:07,059 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:46:07,059 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:46:07,059 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:46:07,061 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:46:07,061 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:46:07,061 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:46:07,061 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:46:07,062 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:46:07,062 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:46:07,062 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:46:07,062 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:46:07,063 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:46:07,063 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:46:07,064 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:46:07,064 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:46:07,064 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:46:07,064 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:46:07,065 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:46:07,065 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:46:07,065 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:46:07,065 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:46:07,066 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:46:07,066 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:46:07,066 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:46:07,067 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:46:07,067 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:46:07,067 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:46:07,067 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:46:07,068 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:46:07,068 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:46:07,068 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:46:07,068 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:46:07,069 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:46:07,069 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:46:07,069 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_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 48263e5b2fdfa125a212d9dd2b1aa7b4bc28734093ef4904b2507084a0cf2933 [2021-11-23 02:46:07,374 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:46:07,396 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:46:07,399 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:46:07,400 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:46:07,401 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:46:07,402 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-2.c [2021-11-23 02:46:07,474 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/data/b2a142773/3e91e04d136f4d5c993c78160be500db/FLAG2595aa8ca [2021-11-23 02:46:08,577 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:46:08,579 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-2.c [2021-11-23 02:46:08,649 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/data/b2a142773/3e91e04d136f4d5c993c78160be500db/FLAG2595aa8ca [2021-11-23 02:46:08,826 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/data/b2a142773/3e91e04d136f4d5c993c78160be500db [2021-11-23 02:46:08,828 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:46:08,831 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:46:08,836 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:46:08,836 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:46:08,840 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:46:08,842 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:46:08" (1/1) ... [2021-11-23 02:46:08,843 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24e25ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:08, skipping insertion in model container [2021-11-23 02:46:08,844 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:46:08" (1/1) ... [2021-11-23 02:46:08,852 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:46:09,168 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:46:11,889 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_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-2.c[378560,378573] [2021-11-23 02:46:11,923 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_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-2.c[383339,383352] [2021-11-23 02:46:12,303 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:46:12,314 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:46:13,514 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_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-2.c[378560,378573] [2021-11-23 02:46:13,526 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_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-2.c[383339,383352] [2021-11-23 02:46:13,577 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:46:13,667 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:46:13,668 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13 WrapperNode [2021-11-23 02:46:13,668 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:46:13,669 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:46:13,669 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:46:13,670 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:46:13,678 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (1/1) ... [2021-11-23 02:46:13,832 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (1/1) ... [2021-11-23 02:46:14,260 INFO L137 Inliner]: procedures = 68, calls = 77, calls flagged for inlining = 46, calls inlined = 46, statements flattened = 13199 [2021-11-23 02:46:14,260 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:46:14,262 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:46:14,262 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:46:14,262 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:46:14,273 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (1/1) ... [2021-11-23 02:46:14,273 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (1/1) ... [2021-11-23 02:46:14,500 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (1/1) ... [2021-11-23 02:46:14,500 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (1/1) ... [2021-11-23 02:46:14,739 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (1/1) ... [2021-11-23 02:46:14,889 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (1/1) ... [2021-11-23 02:46:14,939 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (1/1) ... [2021-11-23 02:46:15,060 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:46:15,062 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:46:15,075 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:46:15,076 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:46:15,077 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (1/1) ... [2021-11-23 02:46:15,091 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:46:15,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:15,153 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:46:15,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:46:15,266 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:46:15,266 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-23 02:46:15,266 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-23 02:46:15,266 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 02:46:15,266 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 02:46:15,266 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-23 02:46:15,267 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-23 02:46:15,267 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-23 02:46:15,267 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-23 02:46:15,267 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-23 02:46:15,267 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-23 02:46:15,267 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-23 02:46:15,268 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-23 02:46:15,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:46:15,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:46:15,268 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:46:15,454 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:46:15,456 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:46:22,992 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:46:25,159 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:46:25,159 INFO L301 CfgBuilder]: Removed 16 assume(true) statements. [2021-11-23 02:46:25,166 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:46:25 BoogieIcfgContainer [2021-11-23 02:46:25,167 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:46:25,169 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:46:25,169 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:46:25,172 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:46:25,173 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:46:08" (1/3) ... [2021-11-23 02:46:25,173 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@688743c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:46:25, skipping insertion in model container [2021-11-23 02:46:25,174 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:46:13" (2/3) ... [2021-11-23 02:46:25,174 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@688743c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:46:25, skipping insertion in model container [2021-11-23 02:46:25,174 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:46:25" (3/3) ... [2021-11-23 02:46:25,176 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label42+token_ring.12.cil-2.c [2021-11-23 02:46:25,181 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:46:25,182 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:46:25,240 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:46:25,247 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:46:25,247 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:46:25,313 INFO L276 IsEmpty]: Start isEmpty. Operand has 1831 states, 1796 states have (on average 1.9560133630289531) internal successors, (3513), 1799 states have internal predecessors, (3513), 26 states have call successors, (26), 6 states have call predecessors, (26), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-23 02:46:25,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 02:46:25,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:25,333 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:25,333 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:25,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:25,343 INFO L85 PathProgramCache]: Analyzing trace with hash -603071020, now seen corresponding path program 1 times [2021-11-23 02:46:25,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:25,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843756833] [2021-11-23 02:46:25,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:25,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:25,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:25,792 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:46:25,792 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:25,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843756833] [2021-11-23 02:46:25,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843756833] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:25,794 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:25,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:46:25,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208683722] [2021-11-23 02:46:25,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:25,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:46:25,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:25,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:46:25,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:25,852 INFO L87 Difference]: Start difference. First operand has 1831 states, 1796 states have (on average 1.9560133630289531) internal successors, (3513), 1799 states have internal predecessors, (3513), 26 states have call successors, (26), 6 states have call predecessors, (26), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:46:27,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:27,124 INFO L93 Difference]: Finished difference Result 3833 states and 7427 transitions. [2021-11-23 02:46:27,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:46:27,127 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 67 [2021-11-23 02:46:27,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:27,169 INFO L225 Difference]: With dead ends: 3833 [2021-11-23 02:46:27,169 INFO L226 Difference]: Without dead ends: 2001 [2021-11-23 02:46:27,184 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 02:46:27,191 INFO L933 BasicCegarLoop]: 3511 mSDtfsCounter, 3779 mSDsluCounter, 3721 mSDsCounter, 0 mSdLazyCounter, 726 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3779 SdHoareTripleChecker+Valid, 6924 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 726 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:27,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3779 Valid, 6924 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 726 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 02:46:27,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2001 states. [2021-11-23 02:46:27,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2001 to 2000. [2021-11-23 02:46:27,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2000 states, 1938 states have (on average 1.9195046439628483) internal successors, (3720), 1941 states have internal predecessors, (3720), 48 states have call successors, (48), 12 states have call predecessors, (48), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-23 02:46:27,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2000 states to 2000 states and 3816 transitions. [2021-11-23 02:46:27,410 INFO L78 Accepts]: Start accepts. Automaton has 2000 states and 3816 transitions. Word has length 67 [2021-11-23 02:46:27,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:27,412 INFO L470 AbstractCegarLoop]: Abstraction has 2000 states and 3816 transitions. [2021-11-23 02:46:27,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:46:27,413 INFO L276 IsEmpty]: Start isEmpty. Operand 2000 states and 3816 transitions. [2021-11-23 02:46:27,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:46:27,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:27,426 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, 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, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:27,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:46:27,426 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:27,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:27,427 INFO L85 PathProgramCache]: Analyzing trace with hash -799309757, now seen corresponding path program 1 times [2021-11-23 02:46:27,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:27,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250127098] [2021-11-23 02:46:27,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:27,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:27,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:27,650 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:46:27,650 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:27,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250127098] [2021-11-23 02:46:27,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250127098] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:27,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423104371] [2021-11-23 02:46:27,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:27,652 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:27,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:27,664 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:27,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:46:27,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:27,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 1050 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:46:27,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:28,327 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:46:28,330 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:46:28,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423104371] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:28,335 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:46:28,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:46:28,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982979805] [2021-11-23 02:46:28,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:28,338 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:46:28,338 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:28,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:46:28,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:28,340 INFO L87 Difference]: Start difference. First operand 2000 states and 3816 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:28,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:28,972 INFO L93 Difference]: Finished difference Result 2701 states and 4915 transitions. [2021-11-23 02:46:28,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:46:28,973 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2021-11-23 02:46:28,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:28,997 INFO L225 Difference]: With dead ends: 2701 [2021-11-23 02:46:28,998 INFO L226 Difference]: Without dead ends: 2347 [2021-11-23 02:46:29,001 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 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 02:46:29,002 INFO L933 BasicCegarLoop]: 3343 mSDtfsCounter, 3507 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3507 SdHoareTripleChecker+Valid, 3568 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:29,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3507 Valid, 3568 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:46:29,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2347 states. [2021-11-23 02:46:29,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2347 to 2343. [2021-11-23 02:46:29,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2343 states, 2227 states have (on average 1.8666367310282892) internal successors, (4157), 2231 states have internal predecessors, (4157), 90 states have call successors, (90), 24 states have call predecessors, (90), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2021-11-23 02:46:29,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2343 states to 2343 states and 4337 transitions. [2021-11-23 02:46:29,129 INFO L78 Accepts]: Start accepts. Automaton has 2343 states and 4337 transitions. Word has length 136 [2021-11-23 02:46:29,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:29,131 INFO L470 AbstractCegarLoop]: Abstraction has 2343 states and 4337 transitions. [2021-11-23 02:46:29,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:29,131 INFO L276 IsEmpty]: Start isEmpty. Operand 2343 states and 4337 transitions. [2021-11-23 02:46:29,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:46:29,139 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:29,140 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, 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, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:29,179 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-23 02:46:29,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-23 02:46:29,355 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:29,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:29,355 INFO L85 PathProgramCache]: Analyzing trace with hash 1141284707, now seen corresponding path program 1 times [2021-11-23 02:46:29,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:29,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883569463] [2021-11-23 02:46:29,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:29,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:29,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:29,511 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:46:29,512 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:29,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883569463] [2021-11-23 02:46:29,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883569463] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:29,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2037097597] [2021-11-23 02:46:29,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:29,513 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:29,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:29,515 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:29,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:46:29,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:29,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 1044 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:46:29,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:29,983 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 02:46:29,984 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:46:29,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2037097597] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:29,984 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:46:29,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:46:29,985 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748425953] [2021-11-23 02:46:29,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:29,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:46:29,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:29,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:46:29,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:29,989 INFO L87 Difference]: Start difference. First operand 2343 states and 4337 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:30,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:30,516 INFO L93 Difference]: Finished difference Result 3724 states and 6496 transitions. [2021-11-23 02:46:30,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:46:30,517 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2021-11-23 02:46:30,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:30,544 INFO L225 Difference]: With dead ends: 3724 [2021-11-23 02:46:30,544 INFO L226 Difference]: Without dead ends: 3027 [2021-11-23 02:46:30,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 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 02:46:30,554 INFO L933 BasicCegarLoop]: 3342 mSDtfsCounter, 3525 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3525 SdHoareTripleChecker+Valid, 3567 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:30,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3525 Valid, 3567 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:46:30,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3027 states. [2021-11-23 02:46:30,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3027 to 3021. [2021-11-23 02:46:30,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3021 states, 2799 states have (on average 1.7931404072883173) internal successors, (5019), 2805 states have internal predecessors, (5019), 172 states have call successors, (172), 48 states have call predecessors, (172), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2021-11-23 02:46:30,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3021 states to 3021 states and 5363 transitions. [2021-11-23 02:46:30,821 INFO L78 Accepts]: Start accepts. Automaton has 3021 states and 5363 transitions. Word has length 136 [2021-11-23 02:46:30,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:30,821 INFO L470 AbstractCegarLoop]: Abstraction has 3021 states and 5363 transitions. [2021-11-23 02:46:30,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:30,822 INFO L276 IsEmpty]: Start isEmpty. Operand 3021 states and 5363 transitions. [2021-11-23 02:46:30,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:46:30,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:30,830 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, 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, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:30,868 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:31,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:31,053 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:31,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:31,054 INFO L85 PathProgramCache]: Analyzing trace with hash -1709951357, now seen corresponding path program 1 times [2021-11-23 02:46:31,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:31,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486120128] [2021-11-23 02:46:31,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:31,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:31,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:31,183 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:46:31,183 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:31,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486120128] [2021-11-23 02:46:31,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486120128] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:31,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330131027] [2021-11-23 02:46:31,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:31,195 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:31,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:31,200 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:31,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:46:31,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:31,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 1038 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:46:31,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:31,646 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:46:31,646 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:46:31,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1330131027] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:31,647 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:46:31,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:46:31,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942144558] [2021-11-23 02:46:31,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:31,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:46:31,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:31,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:46:31,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:31,650 INFO L87 Difference]: Start difference. First operand 3021 states and 5363 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:32,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:32,231 INFO L93 Difference]: Finished difference Result 5746 states and 9608 transitions. [2021-11-23 02:46:32,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:46:32,236 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2021-11-23 02:46:32,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:32,270 INFO L225 Difference]: With dead ends: 5746 [2021-11-23 02:46:32,271 INFO L226 Difference]: Without dead ends: 4371 [2021-11-23 02:46:32,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 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 02:46:32,281 INFO L933 BasicCegarLoop]: 3310 mSDtfsCounter, 3519 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3519 SdHoareTripleChecker+Valid, 3535 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:32,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3519 Valid, 3535 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:46:32,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4371 states. [2021-11-23 02:46:32,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4371 to 4361. [2021-11-23 02:46:32,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4361 states, 3931 states have (on average 1.709234291528873) internal successors, (6719), 3941 states have internal predecessors, (6719), 332 states have call successors, (332), 96 states have call predecessors, (332), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2021-11-23 02:46:32,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4361 states to 4361 states and 7383 transitions. [2021-11-23 02:46:32,548 INFO L78 Accepts]: Start accepts. Automaton has 4361 states and 7383 transitions. Word has length 136 [2021-11-23 02:46:32,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:32,548 INFO L470 AbstractCegarLoop]: Abstraction has 4361 states and 7383 transitions. [2021-11-23 02:46:32,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:32,549 INFO L276 IsEmpty]: Start isEmpty. Operand 4361 states and 7383 transitions. [2021-11-23 02:46:32,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:46:32,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:32,561 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, 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, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:32,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:32,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:32,776 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:32,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:32,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1821792861, now seen corresponding path program 1 times [2021-11-23 02:46:32,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:32,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972779463] [2021-11-23 02:46:32,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:32,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:32,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:32,909 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:46:32,909 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:32,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972779463] [2021-11-23 02:46:32,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [972779463] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:32,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567156448] [2021-11-23 02:46:32,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:32,910 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:32,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:32,911 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:32,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:46:33,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:33,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:46:33,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:33,358 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 02:46:33,359 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:46:33,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567156448] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:33,359 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:46:33,359 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:46:33,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587629311] [2021-11-23 02:46:33,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:33,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:46:33,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:33,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:46:33,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:33,361 INFO L87 Difference]: Start difference. First operand 4361 states and 7383 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:34,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:34,049 INFO L93 Difference]: Finished difference Result 9742 states and 15732 transitions. [2021-11-23 02:46:34,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:46:34,050 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2021-11-23 02:46:34,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:34,104 INFO L225 Difference]: With dead ends: 9742 [2021-11-23 02:46:34,104 INFO L226 Difference]: Without dead ends: 7027 [2021-11-23 02:46:34,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 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 02:46:34,121 INFO L933 BasicCegarLoop]: 3340 mSDtfsCounter, 3528 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3528 SdHoareTripleChecker+Valid, 3565 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:34,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3528 Valid, 3565 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:46:34,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7027 states. [2021-11-23 02:46:34,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7027 to 7009. [2021-11-23 02:46:34,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7009 states, 6171 states have (on average 1.631988332523092) internal successors, (10071), 6189 states have internal predecessors, (10071), 644 states have call successors, (644), 192 states have call predecessors, (644), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2021-11-23 02:46:34,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7009 states to 7009 states and 11359 transitions. [2021-11-23 02:46:34,577 INFO L78 Accepts]: Start accepts. Automaton has 7009 states and 11359 transitions. Word has length 136 [2021-11-23 02:46:34,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:34,577 INFO L470 AbstractCegarLoop]: Abstraction has 7009 states and 11359 transitions. [2021-11-23 02:46:34,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:34,579 INFO L276 IsEmpty]: Start isEmpty. Operand 7009 states and 11359 transitions. [2021-11-23 02:46:34,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:46:34,600 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:34,601 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, 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, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:34,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:34,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:34,820 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:34,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:34,820 INFO L85 PathProgramCache]: Analyzing trace with hash -1427162493, now seen corresponding path program 1 times [2021-11-23 02:46:34,820 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:34,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371989561] [2021-11-23 02:46:34,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:34,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:34,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:34,963 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:46:34,963 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:34,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371989561] [2021-11-23 02:46:34,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371989561] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:34,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355143164] [2021-11-23 02:46:34,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:34,965 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:34,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:34,966 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:35,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:46:35,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:35,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 1026 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:46:35,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:35,539 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:46:35,540 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:46:35,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355143164] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:35,540 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:46:35,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:46:35,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960076569] [2021-11-23 02:46:35,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:35,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:46:35,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:35,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:46:35,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:35,542 INFO L87 Difference]: Start difference. First operand 7009 states and 11359 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:36,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:36,314 INFO L93 Difference]: Finished difference Result 17638 states and 27780 transitions. [2021-11-23 02:46:36,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:46:36,315 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2021-11-23 02:46:36,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:36,410 INFO L225 Difference]: With dead ends: 17638 [2021-11-23 02:46:36,410 INFO L226 Difference]: Without dead ends: 12275 [2021-11-23 02:46:36,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 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 02:46:36,439 INFO L933 BasicCegarLoop]: 3310 mSDtfsCounter, 3498 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3498 SdHoareTripleChecker+Valid, 3535 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:36,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3498 Valid, 3535 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:46:36,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12275 states. [2021-11-23 02:46:36,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12275 to 12241. [2021-11-23 02:46:36,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12241 states, 10603 states have (on average 1.5730453645194755) internal successors, (16679), 10637 states have internal predecessors, (16679), 1252 states have call successors, (1252), 384 states have call predecessors, (1252), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2021-11-23 02:46:37,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12241 states to 12241 states and 19183 transitions. [2021-11-23 02:46:37,018 INFO L78 Accepts]: Start accepts. Automaton has 12241 states and 19183 transitions. Word has length 136 [2021-11-23 02:46:37,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:37,020 INFO L470 AbstractCegarLoop]: Abstraction has 12241 states and 19183 transitions. [2021-11-23 02:46:37,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:37,020 INFO L276 IsEmpty]: Start isEmpty. Operand 12241 states and 19183 transitions. [2021-11-23 02:46:37,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:46:37,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:37,046 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, 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, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:37,083 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:37,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:46:37,260 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:37,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:37,260 INFO L85 PathProgramCache]: Analyzing trace with hash -1894869149, now seen corresponding path program 1 times [2021-11-23 02:46:37,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:37,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294132766] [2021-11-23 02:46:37,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:37,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:37,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:37,374 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:46:37,374 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:37,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294132766] [2021-11-23 02:46:37,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294132766] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:37,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178579021] [2021-11-23 02:46:37,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:37,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:37,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:37,376 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:37,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:46:37,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:37,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 1020 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:46:37,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:37,841 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:46:37,842 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:46:37,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178579021] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:37,842 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:46:37,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:46:37,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481223592] [2021-11-23 02:46:37,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:37,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:46:37,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:37,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:46:37,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:37,845 INFO L87 Difference]: Start difference. First operand 12241 states and 19183 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:39,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:39,122 INFO L93 Difference]: Finished difference Result 33238 states and 51476 transitions. [2021-11-23 02:46:39,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:46:39,123 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2021-11-23 02:46:39,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:39,243 INFO L225 Difference]: With dead ends: 33238 [2021-11-23 02:46:39,244 INFO L226 Difference]: Without dead ends: 22643 [2021-11-23 02:46:39,294 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 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 02:46:39,295 INFO L933 BasicCegarLoop]: 3310 mSDtfsCounter, 3501 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3501 SdHoareTripleChecker+Valid, 3535 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:39,298 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3501 Valid, 3535 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:46:39,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22643 states. [2021-11-23 02:46:40,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22643 to 22577. [2021-11-23 02:46:40,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22577 states, 19371 states have (on average 1.533374632182128) internal successors, (29703), 19437 states have internal predecessors, (29703), 2436 states have call successors, (2436), 768 states have call predecessors, (2436), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2021-11-23 02:46:40,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22577 states to 22577 states and 34575 transitions. [2021-11-23 02:46:40,300 INFO L78 Accepts]: Start accepts. Automaton has 22577 states and 34575 transitions. Word has length 136 [2021-11-23 02:46:40,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:40,304 INFO L470 AbstractCegarLoop]: Abstraction has 22577 states and 34575 transitions. [2021-11-23 02:46:40,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:40,305 INFO L276 IsEmpty]: Start isEmpty. Operand 22577 states and 34575 transitions. [2021-11-23 02:46:40,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:46:40,353 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:40,353 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, 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, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:40,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:40,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 02:46:40,578 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:40,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:40,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1825017475, now seen corresponding path program 1 times [2021-11-23 02:46:40,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:40,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307017965] [2021-11-23 02:46:40,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:40,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:40,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:40,722 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:46:40,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:40,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307017965] [2021-11-23 02:46:40,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307017965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:40,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1154064240] [2021-11-23 02:46:40,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:40,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:40,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:40,724 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:40,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:46:41,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:41,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 1014 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:46:41,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:41,293 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 02:46:41,294 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:46:41,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1154064240] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:41,294 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:46:41,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:46:41,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852801992] [2021-11-23 02:46:41,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:41,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:46:41,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:41,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:46:41,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:41,297 INFO L87 Difference]: Start difference. First operand 22577 states and 34575 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:43,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:43,253 INFO L93 Difference]: Finished difference Result 64054 states and 98068 transitions. [2021-11-23 02:46:43,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:46:43,254 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 136 [2021-11-23 02:46:43,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:43,476 INFO L225 Difference]: With dead ends: 64054 [2021-11-23 02:46:43,476 INFO L226 Difference]: Without dead ends: 43123 [2021-11-23 02:46:43,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 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 02:46:43,559 INFO L933 BasicCegarLoop]: 3310 mSDtfsCounter, 3513 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3513 SdHoareTripleChecker+Valid, 3535 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:43,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3513 Valid, 3535 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:46:43,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43123 states. [2021-11-23 02:46:45,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43123 to 42993. [2021-11-23 02:46:45,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42993 states, 36715 states have (on average 1.5080212447228654) internal successors, (55367), 36845 states have internal predecessors, (55367), 4740 states have call successors, (4740), 1536 states have call predecessors, (4740), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2021-11-23 02:46:46,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42993 states to 42993 states and 64847 transitions. [2021-11-23 02:46:46,219 INFO L78 Accepts]: Start accepts. Automaton has 42993 states and 64847 transitions. Word has length 136 [2021-11-23 02:46:46,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:46,220 INFO L470 AbstractCegarLoop]: Abstraction has 42993 states and 64847 transitions. [2021-11-23 02:46:46,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:46:46,221 INFO L276 IsEmpty]: Start isEmpty. Operand 42993 states and 64847 transitions. [2021-11-23 02:46:46,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 02:46:46,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:46,338 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, 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, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:46,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:46,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d2deb7f-2e80-443f-bb7c-b598a7e201e9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-23 02:46:46,552 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:46,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:46,552 INFO L85 PathProgramCache]: Analyzing trace with hash -1306077789, now seen corresponding path program 1 times [2021-11-23 02:46:46,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:46,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962454231] [2021-11-23 02:46:46,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:46,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:46,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:46,743 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:46:46,743 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:46,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962454231] [2021-11-23 02:46:46,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962454231] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:46,744 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:46,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:46:46,745 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306439821] [2021-11-23 02:46:46,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:46,746 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:46:46,746 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:46,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:46:46,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:46,747 INFO L87 Difference]: Start difference. First operand 42993 states and 64847 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:46:52,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:52,145 INFO L93 Difference]: Finished difference Result 146421 states and 218578 transitions. [2021-11-23 02:46:52,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:46:52,147 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 136 [2021-11-23 02:46:52,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:53,395 INFO L225 Difference]: With dead ends: 146421 [2021-11-23 02:46:53,395 INFO L226 Difference]: Without dead ends: 105075 [2021-11-23 02:46:53,577 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:46:53,581 INFO L933 BasicCegarLoop]: 3313 mSDtfsCounter, 4328 mSDsluCounter, 10516 mSDsCounter, 0 mSdLazyCounter, 1229 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4349 SdHoareTripleChecker+Valid, 13067 SdHoareTripleChecker+Invalid, 1375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 1229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:53,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4349 Valid, 13067 Invalid, 1375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 1229 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 02:46:53,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105075 states. [2021-11-23 02:46:57,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105075 to 82801. [2021-11-23 02:46:57,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82801 states, 70507 states have (on average 1.4914689321627639) internal successors, (105159), 70765 states have internal predecessors, (105159), 9220 states have call successors, (9220), 3072 states have call predecessors, (9220), 3072 states have return successors, (9220), 8964 states have call predecessors, (9220), 9220 states have call successors, (9220) [2021-11-23 02:46:58,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82801 states to 82801 states and 123599 transitions. [2021-11-23 02:46:58,267 INFO L78 Accepts]: Start accepts. Automaton has 82801 states and 123599 transitions. Word has length 136 [2021-11-23 02:46:58,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:58,269 INFO L470 AbstractCegarLoop]: Abstraction has 82801 states and 123599 transitions. [2021-11-23 02:46:58,269 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:46:58,269 INFO L276 IsEmpty]: Start isEmpty. Operand 82801 states and 123599 transitions. [2021-11-23 02:46:58,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-23 02:46:58,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:58,376 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, 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:58,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:46:58,377 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:58,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:58,378 INFO L85 PathProgramCache]: Analyzing trace with hash -751464290, now seen corresponding path program 1 times [2021-11-23 02:46:58,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:58,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216725221] [2021-11-23 02:46:58,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:58,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:58,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:58,553 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:46:58,554 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:58,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216725221] [2021-11-23 02:46:58,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216725221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:58,554 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:58,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:46:58,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946717417] [2021-11-23 02:46:58,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:58,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:46:58,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:58,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:46:58,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:58,557 INFO L87 Difference]: Start difference. First operand 82801 states and 123599 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:47:05,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:47:05,437 INFO L93 Difference]: Finished difference Result 222197 states and 331089 transitions. [2021-11-23 02:47:05,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:47:05,438 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 137 [2021-11-23 02:47:05,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:47:06,047 INFO L225 Difference]: With dead ends: 222197 [2021-11-23 02:47:06,048 INFO L226 Difference]: Without dead ends: 141043 [2021-11-23 02:47:06,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:47:06,270 INFO L933 BasicCegarLoop]: 3305 mSDtfsCounter, 4182 mSDsluCounter, 10618 mSDsCounter, 0 mSdLazyCounter, 1236 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4188 SdHoareTripleChecker+Valid, 13151 SdHoareTripleChecker+Invalid, 1390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 1236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:47:06,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4188 Valid, 13151 Invalid, 1390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 1236 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 02:47:06,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141043 states. [2021-11-23 02:47:11,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141043 to 122353. [2021-11-23 02:47:11,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122353 states, 104043 states have (on average 1.4831463913958651) internal successors, (154311), 104429 states have internal predecessors, (154311), 13700 states have call successors, (13700), 4608 states have call predecessors, (13700), 4608 states have return successors, (13700), 13316 states have call predecessors, (13700), 13700 states have call successors, (13700) [2021-11-23 02:47:12,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122353 states to 122353 states and 181711 transitions. [2021-11-23 02:47:12,660 INFO L78 Accepts]: Start accepts. Automaton has 122353 states and 181711 transitions. Word has length 137 [2021-11-23 02:47:12,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:47:12,661 INFO L470 AbstractCegarLoop]: Abstraction has 122353 states and 181711 transitions. [2021-11-23 02:47:12,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:47:12,662 INFO L276 IsEmpty]: Start isEmpty. Operand 122353 states and 181711 transitions. [2021-11-23 02:47:12,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 02:47:12,882 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:47:12,882 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, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:47:12,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:47:12,883 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:47:12,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:47:12,884 INFO L85 PathProgramCache]: Analyzing trace with hash 1420096899, now seen corresponding path program 1 times [2021-11-23 02:47:12,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:47:12,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55366938] [2021-11-23 02:47:12,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:47:12,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:47:12,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:47:13,045 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:47:13,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:47:13,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55366938] [2021-11-23 02:47:13,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [55366938] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:47:13,046 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:47:13,046 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:47:13,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787139670] [2021-11-23 02:47:13,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:47:13,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:47:13,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:47:13,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:47:13,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:47:13,050 INFO L87 Difference]: Start difference. First operand 122353 states and 181711 transitions. Second operand has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)