./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.5.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.5.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8 --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 351e3bc8fe69313dfbfbeaf7f37de5791a1bf381bb5ef0945347e83cb39fb485 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:26:44,978 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:26:44,991 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:26:45,023 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:26:45,023 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:26:45,025 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:26:45,027 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:26:45,029 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:26:45,031 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:26:45,033 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:26:45,034 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:26:45,036 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:26:45,036 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:26:45,038 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:26:45,039 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:26:45,041 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:26:45,042 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:26:45,044 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:26:45,046 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:26:45,049 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:26:45,052 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:26:45,053 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:26:45,055 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:26:45,056 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:26:45,060 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:26:45,061 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:26:45,061 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:26:45,063 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:26:45,063 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:26:45,065 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:26:45,065 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:26:45,066 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:26:45,067 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:26:45,068 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:26:45,069 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:26:45,070 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:26:45,071 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:26:45,071 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:26:45,072 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:26:45,073 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:26:45,074 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:26:45,075 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:26:45,101 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:26:45,101 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:26:45,103 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:26:45,103 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:26:45,104 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:26:45,104 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:26:45,104 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:26:45,105 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:26:45,105 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:26:45,106 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:26:45,106 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:26:45,107 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:26:45,107 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:26:45,108 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:26:45,108 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:26:45,109 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:26:45,110 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:26:45,110 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:26:45,111 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:26:45,111 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:26:45,111 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:26:45,112 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:26:45,112 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:26:45,113 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:26:45,113 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:26:45,114 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:26:45,114 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:26:45,115 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:26:45,115 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:26:45,115 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:26:45,116 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:26:45,116 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:26:45,116 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:26:45,117 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:26:45,117 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:26:45,117 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:26:45,118 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:26:45,118 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:26:45,118 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:26:45,119 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_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 351e3bc8fe69313dfbfbeaf7f37de5791a1bf381bb5ef0945347e83cb39fb485 [2021-11-07 01:26:45,341 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:26:45,365 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:26:45,368 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:26:45,370 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:26:45,371 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:26:45,372 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.5.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c [2021-11-07 01:26:45,451 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/data/2173c0ade/145331a0c1cf4c07a86f385a3b6f7640/FLAG4512acc28 [2021-11-07 01:26:46,000 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:26:46,001 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.5.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c [2021-11-07 01:26:46,024 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/data/2173c0ade/145331a0c1cf4c07a86f385a3b6f7640/FLAG4512acc28 [2021-11-07 01:26:46,299 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/data/2173c0ade/145331a0c1cf4c07a86f385a3b6f7640 [2021-11-07 01:26:46,301 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:26:46,303 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:26:46,304 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:26:46,305 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:26:46,308 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:26:46,308 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:26:46" (1/1) ... [2021-11-07 01:26:46,310 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@663d2eca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:46, skipping insertion in model container [2021-11-07 01:26:46,310 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:26:46" (1/1) ... [2021-11-07 01:26:46,317 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:26:46,394 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:26:46,715 WARN L228 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_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.5.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c[11101,11114] [2021-11-07 01:26:46,840 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:26:46,852 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:26:46,957 WARN L228 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_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.5.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c[11101,11114] [2021-11-07 01:26:47,031 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:26:47,057 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:26:47,057 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47 WrapperNode [2021-11-07 01:26:47,057 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:26:47,058 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:26:47,059 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:26:47,059 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:26:47,070 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (1/1) ... [2021-11-07 01:26:47,100 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (1/1) ... [2021-11-07 01:26:47,162 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:26:47,163 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:26:47,163 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:26:47,163 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:26:47,171 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (1/1) ... [2021-11-07 01:26:47,172 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (1/1) ... [2021-11-07 01:26:47,178 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (1/1) ... [2021-11-07 01:26:47,178 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (1/1) ... [2021-11-07 01:26:47,195 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (1/1) ... [2021-11-07 01:26:47,206 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (1/1) ... [2021-11-07 01:26:47,210 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (1/1) ... [2021-11-07 01:26:47,216 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:26:47,217 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:26:47,217 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:26:47,217 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:26:47,218 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (1/1) ... [2021-11-07 01:26:47,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:26:47,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:26:47,279 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:26:47,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:26:47,324 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:26:47,325 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:26:47,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:26:47,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:26:50,182 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:26:50,184 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 01:26:50,188 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:26:50 BoogieIcfgContainer [2021-11-07 01:26:50,189 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:26:50,192 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:26:50,193 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:26:50,196 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:26:50,196 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:26:46" (1/3) ... [2021-11-07 01:26:50,198 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@553e094e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:26:50, skipping insertion in model container [2021-11-07 01:26:50,198 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:47" (2/3) ... [2021-11-07 01:26:50,199 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@553e094e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:26:50, skipping insertion in model container [2021-11-07 01:26:50,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:26:50" (3/3) ... [2021-11-07 01:26:50,201 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr-var-start-time.5.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c [2021-11-07 01:26:50,209 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:26:50,210 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:26:50,270 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:26:50,276 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 [2021-11-07 01:26:50,276 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:26:50,300 INFO L276 IsEmpty]: Start isEmpty. Operand has 208 states, 206 states have (on average 1.5485436893203883) internal successors, (319), 207 states have internal predecessors, (319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:50,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-07 01:26:50,316 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:50,317 INFO L513 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] [2021-11-07 01:26:50,318 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:50,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:50,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1527238198, now seen corresponding path program 1 times [2021-11-07 01:26:50,351 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:50,352 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920514866] [2021-11-07 01:26:50,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:50,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:50,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:50,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:50,813 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:50,813 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920514866] [2021-11-07 01:26:50,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [920514866] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:26:50,814 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:26:50,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:26:50,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812734091] [2021-11-07 01:26:50,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:26:50,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:50,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:26:50,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:26:50,855 INFO L87 Difference]: Start difference. First operand has 208 states, 206 states have (on average 1.5485436893203883) internal successors, (319), 207 states have internal predecessors, (319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:51,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:26:51,079 INFO L93 Difference]: Finished difference Result 518 states and 789 transitions. [2021-11-07 01:26:51,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:26:51,085 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-07 01:26:51,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:26:51,101 INFO L225 Difference]: With dead ends: 518 [2021-11-07 01:26:51,101 INFO L226 Difference]: Without dead ends: 319 [2021-11-07 01:26:51,106 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:26:51,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2021-11-07 01:26:51,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 317. [2021-11-07 01:26:51,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 316 states have (on average 1.5126582278481013) internal successors, (478), 316 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:51,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 478 transitions. [2021-11-07 01:26:51,216 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 478 transitions. Word has length 40 [2021-11-07 01:26:51,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:26:51,217 INFO L470 AbstractCegarLoop]: Abstraction has 317 states and 478 transitions. [2021-11-07 01:26:51,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:51,218 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 478 transitions. [2021-11-07 01:26:51,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 01:26:51,225 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:51,225 INFO L513 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] [2021-11-07 01:26:51,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:26:51,226 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:51,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:51,227 INFO L85 PathProgramCache]: Analyzing trace with hash -1624166599, now seen corresponding path program 1 times [2021-11-07 01:26:51,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:51,227 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018975816] [2021-11-07 01:26:51,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:51,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:51,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:51,356 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:51,356 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:51,356 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018975816] [2021-11-07 01:26:51,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018975816] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:26:51,357 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:26:51,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:26:51,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242169269] [2021-11-07 01:26:51,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:26:51,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:51,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:26:51,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:26:51,360 INFO L87 Difference]: Start difference. First operand 317 states and 478 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:51,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:26:51,442 INFO L93 Difference]: Finished difference Result 793 states and 1196 transitions. [2021-11-07 01:26:51,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:26:51,443 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-07 01:26:51,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:26:51,448 INFO L225 Difference]: With dead ends: 793 [2021-11-07 01:26:51,448 INFO L226 Difference]: Without dead ends: 504 [2021-11-07 01:26:51,450 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:26:51,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-11-07 01:26:51,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 502. [2021-11-07 01:26:51,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 1.5069860279441119) internal successors, (755), 501 states have internal predecessors, (755), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:51,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 755 transitions. [2021-11-07 01:26:51,489 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 755 transitions. Word has length 46 [2021-11-07 01:26:51,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:26:51,489 INFO L470 AbstractCegarLoop]: Abstraction has 502 states and 755 transitions. [2021-11-07 01:26:51,489 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:51,490 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 755 transitions. [2021-11-07 01:26:51,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 01:26:51,492 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:51,492 INFO L513 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] [2021-11-07 01:26:51,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 01:26:51,493 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:51,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:51,493 INFO L85 PathProgramCache]: Analyzing trace with hash 84772929, now seen corresponding path program 1 times [2021-11-07 01:26:51,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:51,494 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380017304] [2021-11-07 01:26:51,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:51,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:51,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:51,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:51,583 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:51,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380017304] [2021-11-07 01:26:51,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [380017304] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:26:51,584 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:26:51,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:26:51,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992502244] [2021-11-07 01:26:51,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:26:51,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:51,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:26:51,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:26:51,586 INFO L87 Difference]: Start difference. First operand 502 states and 755 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:51,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:26:51,669 INFO L93 Difference]: Finished difference Result 1261 states and 1895 transitions. [2021-11-07 01:26:51,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:26:51,669 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-07 01:26:51,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:26:51,676 INFO L225 Difference]: With dead ends: 1261 [2021-11-07 01:26:51,677 INFO L226 Difference]: Without dead ends: 800 [2021-11-07 01:26:51,682 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:26:51,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 800 states. [2021-11-07 01:26:51,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 800 to 798. [2021-11-07 01:26:51,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 798 states, 797 states have (on average 1.4981179422835633) internal successors, (1194), 797 states have internal predecessors, (1194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:51,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 798 states to 798 states and 1194 transitions. [2021-11-07 01:26:51,764 INFO L78 Accepts]: Start accepts. Automaton has 798 states and 1194 transitions. Word has length 52 [2021-11-07 01:26:51,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:26:51,764 INFO L470 AbstractCegarLoop]: Abstraction has 798 states and 1194 transitions. [2021-11-07 01:26:51,764 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:51,765 INFO L276 IsEmpty]: Start isEmpty. Operand 798 states and 1194 transitions. [2021-11-07 01:26:51,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-07 01:26:51,768 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:51,768 INFO L513 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] [2021-11-07 01:26:51,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 01:26:51,768 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:51,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:51,769 INFO L85 PathProgramCache]: Analyzing trace with hash 1115837971, now seen corresponding path program 1 times [2021-11-07 01:26:51,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:51,769 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226673468] [2021-11-07 01:26:51,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:51,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:51,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:51,912 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:51,913 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:51,913 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226673468] [2021-11-07 01:26:51,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226673468] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:26:51,914 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:26:51,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:26:51,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329395975] [2021-11-07 01:26:51,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:26:51,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:51,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:26:51,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:26:51,916 INFO L87 Difference]: Start difference. First operand 798 states and 1194 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 3 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:52,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:26:52,019 INFO L93 Difference]: Finished difference Result 1988 states and 2966 transitions. [2021-11-07 01:26:52,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:26:52,019 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 3 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-07 01:26:52,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:26:52,027 INFO L225 Difference]: With dead ends: 1988 [2021-11-07 01:26:52,027 INFO L226 Difference]: Without dead ends: 1244 [2021-11-07 01:26:52,029 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:26:52,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1244 states. [2021-11-07 01:26:52,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1244 to 1242. [2021-11-07 01:26:52,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1242 states, 1241 states have (on average 1.48348106365834) internal successors, (1841), 1241 states have internal predecessors, (1841), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:52,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1242 states to 1242 states and 1841 transitions. [2021-11-07 01:26:52,106 INFO L78 Accepts]: Start accepts. Automaton has 1242 states and 1841 transitions. Word has length 58 [2021-11-07 01:26:52,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:26:52,106 INFO L470 AbstractCegarLoop]: Abstraction has 1242 states and 1841 transitions. [2021-11-07 01:26:52,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 3 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:52,107 INFO L276 IsEmpty]: Start isEmpty. Operand 1242 states and 1841 transitions. [2021-11-07 01:26:52,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 01:26:52,110 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:52,110 INFO L513 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] [2021-11-07 01:26:52,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 01:26:52,111 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:52,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:52,112 INFO L85 PathProgramCache]: Analyzing trace with hash -1526384750, now seen corresponding path program 1 times [2021-11-07 01:26:52,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:52,112 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642226731] [2021-11-07 01:26:52,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:52,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:52,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:52,219 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:52,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:52,220 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642226731] [2021-11-07 01:26:52,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642226731] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:26:52,221 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:26:52,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:26:52,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880397704] [2021-11-07 01:26:52,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:26:52,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:52,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:26:52,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:26:52,223 INFO L87 Difference]: Start difference. First operand 1242 states and 1841 transitions. Second operand has 4 states, 4 states have (on average 16.0) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:52,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:26:52,394 INFO L93 Difference]: Finished difference Result 3011 states and 4433 transitions. [2021-11-07 01:26:52,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:26:52,395 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-07 01:26:52,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:26:52,407 INFO L225 Difference]: With dead ends: 3011 [2021-11-07 01:26:52,407 INFO L226 Difference]: Without dead ends: 1836 [2021-11-07 01:26:52,411 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:26:52,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1836 states. [2021-11-07 01:26:52,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1836 to 1834. [2021-11-07 01:26:52,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1834 states, 1833 states have (on average 1.4577195853791598) internal successors, (2672), 1833 states have internal predecessors, (2672), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:52,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1834 states to 1834 states and 2672 transitions. [2021-11-07 01:26:52,586 INFO L78 Accepts]: Start accepts. Automaton has 1834 states and 2672 transitions. Word has length 64 [2021-11-07 01:26:52,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:26:52,587 INFO L470 AbstractCegarLoop]: Abstraction has 1834 states and 2672 transitions. [2021-11-07 01:26:52,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:52,587 INFO L276 IsEmpty]: Start isEmpty. Operand 1834 states and 2672 transitions. [2021-11-07 01:26:52,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 01:26:52,593 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:52,593 INFO L513 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, 1, 1, 1] [2021-11-07 01:26:52,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 01:26:52,593 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:52,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:52,594 INFO L85 PathProgramCache]: Analyzing trace with hash 100503792, now seen corresponding path program 1 times [2021-11-07 01:26:52,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:52,594 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593839685] [2021-11-07 01:26:52,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:52,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:52,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:52,849 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:52,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:52,851 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593839685] [2021-11-07 01:26:52,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593839685] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:26:52,852 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:26:52,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-07 01:26:52,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071111159] [2021-11-07 01:26:52,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 01:26:52,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:52,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 01:26:52,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:26:52,854 INFO L87 Difference]: Start difference. First operand 1834 states and 2672 transitions. Second operand has 8 states, 8 states have (on average 8.75) internal successors, (70), 7 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:53,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:26:53,785 INFO L93 Difference]: Finished difference Result 9177 states and 13246 transitions. [2021-11-07 01:26:53,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:26:53,786 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.75) internal successors, (70), 7 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-07 01:26:53,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:26:53,832 INFO L225 Difference]: With dead ends: 9177 [2021-11-07 01:26:53,833 INFO L226 Difference]: Without dead ends: 7404 [2021-11-07 01:26:53,839 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:26:53,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7404 states. [2021-11-07 01:26:54,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7404 to 7396. [2021-11-07 01:26:54,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7396 states, 7395 states have (on average 1.4367816091954022) internal successors, (10625), 7395 states have internal predecessors, (10625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:54,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7396 states to 7396 states and 10625 transitions. [2021-11-07 01:26:54,535 INFO L78 Accepts]: Start accepts. Automaton has 7396 states and 10625 transitions. Word has length 70 [2021-11-07 01:26:54,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:26:54,536 INFO L470 AbstractCegarLoop]: Abstraction has 7396 states and 10625 transitions. [2021-11-07 01:26:54,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 8.75) internal successors, (70), 7 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:54,537 INFO L276 IsEmpty]: Start isEmpty. Operand 7396 states and 10625 transitions. [2021-11-07 01:26:54,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:26:54,557 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:54,557 INFO L513 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, 1, 1, 1, 1, 1] [2021-11-07 01:26:54,557 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 01:26:54,558 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:54,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:54,559 INFO L85 PathProgramCache]: Analyzing trace with hash -487776601, now seen corresponding path program 1 times [2021-11-07 01:26:54,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:54,559 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483627006] [2021-11-07 01:26:54,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:54,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:54,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:54,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:54,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:54,622 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483627006] [2021-11-07 01:26:54,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483627006] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:26:54,623 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:26:54,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:26:54,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758264111] [2021-11-07 01:26:54,623 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:26:54,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:54,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:26:54,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:26:54,625 INFO L87 Difference]: Start difference. First operand 7396 states and 10625 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:55,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:26:55,543 INFO L93 Difference]: Finished difference Result 17997 states and 25789 transitions. [2021-11-07 01:26:55,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:26:55,578 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-07 01:26:55,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:26:55,657 INFO L225 Difference]: With dead ends: 17997 [2021-11-07 01:26:55,657 INFO L226 Difference]: Without dead ends: 12794 [2021-11-07 01:26:55,666 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:26:55,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12794 states. [2021-11-07 01:26:56,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12794 to 12792. [2021-11-07 01:26:56,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12792 states, 12791 states have (on average 1.4245954186537408) internal successors, (18222), 12791 states have internal predecessors, (18222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:56,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12792 states to 12792 states and 18222 transitions. [2021-11-07 01:26:56,827 INFO L78 Accepts]: Start accepts. Automaton has 12792 states and 18222 transitions. Word has length 72 [2021-11-07 01:26:56,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:26:56,830 INFO L470 AbstractCegarLoop]: Abstraction has 12792 states and 18222 transitions. [2021-11-07 01:26:56,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:56,830 INFO L276 IsEmpty]: Start isEmpty. Operand 12792 states and 18222 transitions. [2021-11-07 01:26:56,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:26:56,865 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:56,865 INFO L513 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, 1, 1, 1, 1, 1] [2021-11-07 01:26:56,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 01:26:56,866 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:56,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:56,867 INFO L85 PathProgramCache]: Analyzing trace with hash 377835833, now seen corresponding path program 1 times [2021-11-07 01:26:56,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:56,868 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585740402] [2021-11-07 01:26:56,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:56,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:56,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:56,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:56,955 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:56,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585740402] [2021-11-07 01:26:56,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585740402] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:26:56,956 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:26:56,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:26:56,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192355678] [2021-11-07 01:26:56,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:26:56,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:56,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:26:56,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:26:56,959 INFO L87 Difference]: Start difference. First operand 12792 states and 18222 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:58,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:26:58,150 INFO L93 Difference]: Finished difference Result 28111 states and 39907 transitions. [2021-11-07 01:26:58,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:26:58,159 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-07 01:26:58,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:26:58,224 INFO L225 Difference]: With dead ends: 28111 [2021-11-07 01:26:58,224 INFO L226 Difference]: Without dead ends: 20573 [2021-11-07 01:26:58,240 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:26:58,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20573 states. [2021-11-07 01:26:59,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20573 to 20571. [2021-11-07 01:26:59,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20571 states, 20570 states have (on average 1.411229946524064) internal successors, (29029), 20570 states have internal predecessors, (29029), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:59,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20571 states to 20571 states and 29029 transitions. [2021-11-07 01:26:59,702 INFO L78 Accepts]: Start accepts. Automaton has 20571 states and 29029 transitions. Word has length 72 [2021-11-07 01:26:59,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:26:59,703 INFO L470 AbstractCegarLoop]: Abstraction has 20571 states and 29029 transitions. [2021-11-07 01:26:59,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:59,703 INFO L276 IsEmpty]: Start isEmpty. Operand 20571 states and 29029 transitions. [2021-11-07 01:26:59,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:26:59,756 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:59,756 INFO L513 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, 1, 1, 1, 1, 1] [2021-11-07 01:26:59,756 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 01:26:59,756 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:59,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:59,757 INFO L85 PathProgramCache]: Analyzing trace with hash 794222759, now seen corresponding path program 1 times [2021-11-07 01:26:59,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:59,757 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076469618] [2021-11-07 01:26:59,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:59,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:59,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:59,816 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:59,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:59,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076469618] [2021-11-07 01:26:59,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076469618] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:26:59,817 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:26:59,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:26:59,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636779728] [2021-11-07 01:26:59,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:26:59,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:59,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:26:59,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:26:59,820 INFO L87 Difference]: Start difference. First operand 20571 states and 29029 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:01,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:01,375 INFO L93 Difference]: Finished difference Result 40087 states and 56271 transitions. [2021-11-07 01:27:01,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:27:01,376 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-07 01:27:01,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:01,465 INFO L225 Difference]: With dead ends: 40087 [2021-11-07 01:27:01,466 INFO L226 Difference]: Without dead ends: 30437 [2021-11-07 01:27:01,485 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:01,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30437 states. [2021-11-07 01:27:03,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30437 to 30435. [2021-11-07 01:27:03,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30435 states, 30434 states have (on average 1.395183018991917) internal successors, (42461), 30434 states have internal predecessors, (42461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:03,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30435 states to 30435 states and 42461 transitions. [2021-11-07 01:27:03,623 INFO L78 Accepts]: Start accepts. Automaton has 30435 states and 42461 transitions. Word has length 72 [2021-11-07 01:27:03,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:03,623 INFO L470 AbstractCegarLoop]: Abstraction has 30435 states and 42461 transitions. [2021-11-07 01:27:03,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:03,624 INFO L276 IsEmpty]: Start isEmpty. Operand 30435 states and 42461 transitions. [2021-11-07 01:27:03,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:27:03,736 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:03,736 INFO L513 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, 1, 1, 1, 1, 1] [2021-11-07 01:27:03,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-07 01:27:03,737 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:03,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:03,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1905395513, now seen corresponding path program 1 times [2021-11-07 01:27:03,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:03,738 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65704083] [2021-11-07 01:27:03,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:03,738 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:03,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:03,799 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:03,799 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:03,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65704083] [2021-11-07 01:27:03,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65704083] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:27:03,800 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:27:03,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:27:03,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445321269] [2021-11-07 01:27:03,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:27:03,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:03,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:27:03,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:03,802 INFO L87 Difference]: Start difference. First operand 30435 states and 42461 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:05,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:05,596 INFO L93 Difference]: Finished difference Result 48763 states and 67427 transitions. [2021-11-07 01:27:05,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:27:05,596 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-07 01:27:05,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:05,684 INFO L225 Difference]: With dead ends: 48763 [2021-11-07 01:27:05,685 INFO L226 Difference]: Without dead ends: 39609 [2021-11-07 01:27:05,710 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:05,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39609 states. [2021-11-07 01:27:08,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39609 to 39607. [2021-11-07 01:27:08,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39607 states, 39606 states have (on average 1.374362470332778) internal successors, (54433), 39606 states have internal predecessors, (54433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:08,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39607 states to 39607 states and 54433 transitions. [2021-11-07 01:27:08,404 INFO L78 Accepts]: Start accepts. Automaton has 39607 states and 54433 transitions. Word has length 72 [2021-11-07 01:27:08,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:08,404 INFO L470 AbstractCegarLoop]: Abstraction has 39607 states and 54433 transitions. [2021-11-07 01:27:08,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:08,405 INFO L276 IsEmpty]: Start isEmpty. Operand 39607 states and 54433 transitions. [2021-11-07 01:27:08,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:27:08,481 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:08,481 INFO L513 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:27:08,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 01:27:08,481 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:08,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:08,482 INFO L85 PathProgramCache]: Analyzing trace with hash -1174942000, now seen corresponding path program 1 times [2021-11-07 01:27:08,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:08,485 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334751064] [2021-11-07 01:27:08,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:08,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:08,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:08,787 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:08,787 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:08,788 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334751064] [2021-11-07 01:27:08,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [334751064] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:27:08,788 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:27:08,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:27:08,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408845587] [2021-11-07 01:27:08,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:27:08,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:08,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:27:08,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:27:08,791 INFO L87 Difference]: Start difference. First operand 39607 states and 54433 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:12,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:12,825 INFO L93 Difference]: Finished difference Result 95302 states and 131347 transitions. [2021-11-07 01:27:12,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:27:12,826 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:27:12,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:12,925 INFO L225 Difference]: With dead ends: 95302 [2021-11-07 01:27:12,925 INFO L226 Difference]: Without dead ends: 55705 [2021-11-07 01:27:12,977 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:27:13,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55705 states. [2021-11-07 01:27:16,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55705 to 55703. [2021-11-07 01:27:16,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55703 states, 55702 states have (on average 1.3715845032494345) internal successors, (76400), 55702 states have internal predecessors, (76400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:16,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55703 states to 55703 states and 76400 transitions. [2021-11-07 01:27:16,614 INFO L78 Accepts]: Start accepts. Automaton has 55703 states and 76400 transitions. Word has length 74 [2021-11-07 01:27:16,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:16,614 INFO L470 AbstractCegarLoop]: Abstraction has 55703 states and 76400 transitions. [2021-11-07 01:27:16,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:16,614 INFO L276 IsEmpty]: Start isEmpty. Operand 55703 states and 76400 transitions. [2021-11-07 01:27:16,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:27:16,709 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:16,709 INFO L513 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:27:16,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 01:27:16,710 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:16,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:16,711 INFO L85 PathProgramCache]: Analyzing trace with hash -522801936, now seen corresponding path program 1 times [2021-11-07 01:27:16,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:16,711 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328946417] [2021-11-07 01:27:16,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:16,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:16,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:16,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:16,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:16,807 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328946417] [2021-11-07 01:27:16,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328946417] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:27:16,808 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:27:16,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:27:16,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769122930] [2021-11-07 01:27:16,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:27:16,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:16,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:27:16,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:16,810 INFO L87 Difference]: Start difference. First operand 55703 states and 76400 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:18,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:18,821 INFO L93 Difference]: Finished difference Result 84683 states and 116210 transitions. [2021-11-07 01:27:18,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:27:18,823 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:27:18,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:18,871 INFO L225 Difference]: With dead ends: 84683 [2021-11-07 01:27:18,871 INFO L226 Difference]: Without dead ends: 34471 [2021-11-07 01:27:18,907 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:18,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34471 states. [2021-11-07 01:27:21,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34471 to 34469. [2021-11-07 01:27:21,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34469 states, 34468 states have (on average 1.3586224904259023) internal successors, (46829), 34468 states have internal predecessors, (46829), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:21,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34469 states to 34469 states and 46829 transitions. [2021-11-07 01:27:21,211 INFO L78 Accepts]: Start accepts. Automaton has 34469 states and 46829 transitions. Word has length 74 [2021-11-07 01:27:21,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:21,211 INFO L470 AbstractCegarLoop]: Abstraction has 34469 states and 46829 transitions. [2021-11-07 01:27:21,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:21,212 INFO L276 IsEmpty]: Start isEmpty. Operand 34469 states and 46829 transitions. [2021-11-07 01:27:21,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:27:21,257 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:21,257 INFO L513 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:27:21,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-07 01:27:21,257 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:21,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:21,258 INFO L85 PathProgramCache]: Analyzing trace with hash 871742522, now seen corresponding path program 1 times [2021-11-07 01:27:21,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:21,258 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971824567] [2021-11-07 01:27:21,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:21,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:21,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:21,371 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:21,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:21,371 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971824567] [2021-11-07 01:27:21,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971824567] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:27:21,372 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:27:21,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:27:21,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222550704] [2021-11-07 01:27:21,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:27:21,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:21,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:27:21,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:21,374 INFO L87 Difference]: Start difference. First operand 34469 states and 46829 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:22,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:22,597 INFO L93 Difference]: Finished difference Result 48961 states and 66487 transitions. [2021-11-07 01:27:22,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:27:22,598 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:27:22,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:22,632 INFO L225 Difference]: With dead ends: 48961 [2021-11-07 01:27:22,632 INFO L226 Difference]: Without dead ends: 17445 [2021-11-07 01:27:22,657 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:22,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17445 states. [2021-11-07 01:27:23,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17445 to 17443. [2021-11-07 01:27:23,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17443 states, 17442 states have (on average 1.3417612659098728) internal successors, (23403), 17442 states have internal predecessors, (23403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:23,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17443 states to 17443 states and 23403 transitions. [2021-11-07 01:27:23,830 INFO L78 Accepts]: Start accepts. Automaton has 17443 states and 23403 transitions. Word has length 74 [2021-11-07 01:27:23,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:23,830 INFO L470 AbstractCegarLoop]: Abstraction has 17443 states and 23403 transitions. [2021-11-07 01:27:23,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:23,831 INFO L276 IsEmpty]: Start isEmpty. Operand 17443 states and 23403 transitions. [2021-11-07 01:27:23,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:27:23,846 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:23,846 INFO L513 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:27:23,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-07 01:27:23,846 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:23,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:23,847 INFO L85 PathProgramCache]: Analyzing trace with hash 878033260, now seen corresponding path program 1 times [2021-11-07 01:27:23,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:23,847 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422839371] [2021-11-07 01:27:23,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:23,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:23,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:23,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:23,923 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:23,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422839371] [2021-11-07 01:27:23,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422839371] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:27:23,923 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:27:23,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:27:23,924 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132335376] [2021-11-07 01:27:23,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:27:23,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:23,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:27:23,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:23,925 INFO L87 Difference]: Start difference. First operand 17443 states and 23403 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:24,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:24,634 INFO L93 Difference]: Finished difference Result 24691 states and 33109 transitions. [2021-11-07 01:27:24,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:27:24,635 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:27:24,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:24,646 INFO L225 Difference]: With dead ends: 24691 [2021-11-07 01:27:24,646 INFO L226 Difference]: Without dead ends: 9149 [2021-11-07 01:27:24,659 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:24,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9149 states. [2021-11-07 01:27:25,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9149 to 9147. [2021-11-07 01:27:25,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9147 states, 9146 states have (on average 1.3154384430352066) internal successors, (12031), 9146 states have internal predecessors, (12031), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:25,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9147 states to 9147 states and 12031 transitions. [2021-11-07 01:27:25,279 INFO L78 Accepts]: Start accepts. Automaton has 9147 states and 12031 transitions. Word has length 74 [2021-11-07 01:27:25,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:25,280 INFO L470 AbstractCegarLoop]: Abstraction has 9147 states and 12031 transitions. [2021-11-07 01:27:25,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:25,280 INFO L276 IsEmpty]: Start isEmpty. Operand 9147 states and 12031 transitions. [2021-11-07 01:27:25,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:27:25,286 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:25,286 INFO L513 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:27:25,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-07 01:27:25,287 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:25,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:25,287 INFO L85 PathProgramCache]: Analyzing trace with hash -113284023, now seen corresponding path program 1 times [2021-11-07 01:27:25,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:25,288 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956497250] [2021-11-07 01:27:25,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:25,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:25,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:25,417 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:25,417 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:25,417 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956497250] [2021-11-07 01:27:25,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956497250] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:27:25,417 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:27:25,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 01:27:25,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460478159] [2021-11-07 01:27:25,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:27:25,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:25,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:27:25,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:27:25,419 INFO L87 Difference]: Start difference. First operand 9147 states and 12031 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:26,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:26,835 INFO L93 Difference]: Finished difference Result 23179 states and 30366 transitions. [2021-11-07 01:27:26,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 01:27:26,840 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:27:26,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:26,859 INFO L225 Difference]: With dead ends: 23179 [2021-11-07 01:27:26,859 INFO L226 Difference]: Without dead ends: 14369 [2021-11-07 01:27:26,866 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:27:26,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14369 states. [2021-11-07 01:27:27,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14369 to 13405. [2021-11-07 01:27:27,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13405 states, 13404 states have (on average 1.3099820948970458) internal successors, (17559), 13404 states have internal predecessors, (17559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:27,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13405 states to 13405 states and 17559 transitions. [2021-11-07 01:27:27,718 INFO L78 Accepts]: Start accepts. Automaton has 13405 states and 17559 transitions. Word has length 74 [2021-11-07 01:27:27,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:27,718 INFO L470 AbstractCegarLoop]: Abstraction has 13405 states and 17559 transitions. [2021-11-07 01:27:27,718 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:27,718 INFO L276 IsEmpty]: Start isEmpty. Operand 13405 states and 17559 transitions. [2021-11-07 01:27:27,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:27:27,726 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:27,727 INFO L513 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:27:27,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-07 01:27:27,727 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:27,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:27,727 INFO L85 PathProgramCache]: Analyzing trace with hash 22477188, now seen corresponding path program 1 times [2021-11-07 01:27:27,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:27,728 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581313447] [2021-11-07 01:27:27,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:27,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:27,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:27,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:27,919 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:27,920 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581313447] [2021-11-07 01:27:27,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581313447] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:27:27,920 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:27:27,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 01:27:27,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288890908] [2021-11-07 01:27:27,920 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:27:27,921 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:27,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:27:27,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:27:27,921 INFO L87 Difference]: Start difference. First operand 13405 states and 17559 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:29,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:29,544 INFO L93 Difference]: Finished difference Result 20599 states and 27070 transitions. [2021-11-07 01:27:29,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:27:29,545 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:27:29,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:29,567 INFO L225 Difference]: With dead ends: 20599 [2021-11-07 01:27:29,567 INFO L226 Difference]: Without dead ends: 20597 [2021-11-07 01:27:29,572 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:27:29,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20597 states. [2021-11-07 01:27:30,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20597 to 18645. [2021-11-07 01:27:30,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18645 states, 18644 states have (on average 1.3154366015876422) internal successors, (24525), 18644 states have internal predecessors, (24525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:30,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18645 states to 18645 states and 24525 transitions. [2021-11-07 01:27:30,792 INFO L78 Accepts]: Start accepts. Automaton has 18645 states and 24525 transitions. Word has length 74 [2021-11-07 01:27:30,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:30,792 INFO L470 AbstractCegarLoop]: Abstraction has 18645 states and 24525 transitions. [2021-11-07 01:27:30,792 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:30,793 INFO L276 IsEmpty]: Start isEmpty. Operand 18645 states and 24525 transitions. [2021-11-07 01:27:30,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:27:30,801 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:30,801 INFO L513 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:27:30,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-07 01:27:30,801 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:30,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:30,802 INFO L85 PathProgramCache]: Analyzing trace with hash -7103060, now seen corresponding path program 1 times [2021-11-07 01:27:30,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:30,802 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075458817] [2021-11-07 01:27:30,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:30,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:30,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:30,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:30,864 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:30,864 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075458817] [2021-11-07 01:27:30,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075458817] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:27:30,865 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:27:30,865 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:27:30,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129465275] [2021-11-07 01:27:30,865 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:27:30,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:30,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:27:30,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:30,866 INFO L87 Difference]: Start difference. First operand 18645 states and 24525 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:31,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:31,907 INFO L93 Difference]: Finished difference Result 24825 states and 32721 transitions. [2021-11-07 01:27:31,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:27:31,907 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:27:31,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:31,919 INFO L225 Difference]: With dead ends: 24825 [2021-11-07 01:27:31,919 INFO L226 Difference]: Without dead ends: 10069 [2021-11-07 01:27:31,931 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:31,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10069 states. [2021-11-07 01:27:32,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10069 to 10067. [2021-11-07 01:27:32,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10067 states, 10066 states have (on average 1.2933637989270812) internal successors, (13019), 10066 states have internal predecessors, (13019), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:32,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10067 states to 10067 states and 13019 transitions. [2021-11-07 01:27:32,730 INFO L78 Accepts]: Start accepts. Automaton has 10067 states and 13019 transitions. Word has length 74 [2021-11-07 01:27:32,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:32,731 INFO L470 AbstractCegarLoop]: Abstraction has 10067 states and 13019 transitions. [2021-11-07 01:27:32,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:32,731 INFO L276 IsEmpty]: Start isEmpty. Operand 10067 states and 13019 transitions. [2021-11-07 01:27:32,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:27:32,735 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:32,735 INFO L513 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:27:32,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-07 01:27:32,735 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:32,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:32,736 INFO L85 PathProgramCache]: Analyzing trace with hash -1557211749, now seen corresponding path program 1 times [2021-11-07 01:27:32,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:32,736 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876131897] [2021-11-07 01:27:32,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:32,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:32,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:32,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:32,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:32,798 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876131897] [2021-11-07 01:27:32,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1876131897] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:27:32,798 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:27:32,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:27:32,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579878391] [2021-11-07 01:27:32,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:27:32,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:32,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:27:32,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:32,800 INFO L87 Difference]: Start difference. First operand 10067 states and 13019 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:33,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:33,331 INFO L93 Difference]: Finished difference Result 13943 states and 18136 transitions. [2021-11-07 01:27:33,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:27:33,332 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:27:33,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:33,340 INFO L225 Difference]: With dead ends: 13943 [2021-11-07 01:27:33,340 INFO L226 Difference]: Without dead ends: 5883 [2021-11-07 01:27:33,346 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:27:33,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5883 states. [2021-11-07 01:27:33,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5883 to 5881. [2021-11-07 01:27:33,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5881 states, 5880 states have (on average 1.2726190476190475) internal successors, (7483), 5880 states have internal predecessors, (7483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:33,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5881 states to 5881 states and 7483 transitions. [2021-11-07 01:27:33,709 INFO L78 Accepts]: Start accepts. Automaton has 5881 states and 7483 transitions. Word has length 74 [2021-11-07 01:27:33,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:33,709 INFO L470 AbstractCegarLoop]: Abstraction has 5881 states and 7483 transitions. [2021-11-07 01:27:33,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:33,710 INFO L276 IsEmpty]: Start isEmpty. Operand 5881 states and 7483 transitions. [2021-11-07 01:27:33,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-07 01:27:33,713 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:33,714 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:27:33,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-07 01:27:33,714 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:33,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:33,714 INFO L85 PathProgramCache]: Analyzing trace with hash 2025521546, now seen corresponding path program 1 times [2021-11-07 01:27:33,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:33,714 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910322351] [2021-11-07 01:27:33,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:33,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:33,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:34,717 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:34,717 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:34,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910322351] [2021-11-07 01:27:34,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910322351] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:27:34,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823645101] [2021-11-07 01:27:34,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:34,718 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:27:34,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:27:34,724 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:27:34,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_146ff5d5-d512-4fb6-a2da-4b7fd16850c8/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 01:27:34,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:34,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-07 01:27:34,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:27:44,838 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-07 01:27:44,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:27:49,037 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-07 01:27:49,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823645101] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:27:49,038 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 01:27:49,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19, 17] imperfect sequences [17] total 51 [2021-11-07 01:27:49,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136139374] [2021-11-07 01:27:49,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-07 01:27:49,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:49,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-07 01:27:49,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2282, Unknown=0, NotChecked=0, Total=2652 [2021-11-07 01:27:49,042 INFO L87 Difference]: Start difference. First operand 5881 states and 7483 transitions. Second operand has 36 states, 36 states have (on average 3.8333333333333335) internal successors, (138), 35 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)