./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label55.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label55.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7 --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 892d3c9e0b7c167d810581087b0633fb7bb5cd8a7fe1ab934154adc1945085ff --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:23:45,981 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:23:45,984 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:23:46,043 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:23:46,044 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:23:46,045 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:23:46,047 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:23:46,050 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:23:46,052 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:23:46,054 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:23:46,055 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:23:46,057 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:23:46,058 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:23:46,059 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:23:46,061 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:23:46,063 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:23:46,065 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:23:46,066 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:23:46,069 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:23:46,072 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:23:46,080 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:23:46,083 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:23:46,085 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:23:46,093 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:23:46,098 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:23:46,103 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:23:46,104 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:23:46,105 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:23:46,106 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:23:46,108 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:23:46,109 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:23:46,111 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:23:46,113 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:23:46,114 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:23:46,116 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:23:46,117 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:23:46,119 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:23:46,119 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:23:46,119 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:23:46,121 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:23:46,122 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:23:46,123 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:23:46,182 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:23:46,182 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:23:46,183 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:23:46,183 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:23:46,185 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:23:46,185 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:23:46,185 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:23:46,186 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:23:46,186 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:23:46,186 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:23:46,188 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:23:46,188 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:23:46,189 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:23:46,189 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:23:46,189 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:23:46,190 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:23:46,190 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:23:46,190 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:23:46,191 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:23:46,192 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:23:46,192 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:23:46,192 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:23:46,192 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:23:46,193 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:23:46,193 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:23:46,193 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:23:46,194 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:23:46,194 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:23:46,194 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:23:46,195 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:23:46,195 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:23:46,196 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:23:46,196 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:23:46,196 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:23:46,197 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:23:46,197 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:23:46,197 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:23:46,198 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:23:46,198 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:23:46,198 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:23:46,199 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:23:46,199 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_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 892d3c9e0b7c167d810581087b0633fb7bb5cd8a7fe1ab934154adc1945085ff [2021-11-25 20:23:46,499 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:23:46,527 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:23:46,530 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:23:46,531 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:23:46,533 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:23:46,535 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/eca-rers2012/Problem03_label55.c [2021-11-25 20:23:46,633 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/data/59cf418a6/384e9b3bb70d42bfaa5733ffeee6474c/FLAG43a3cfb61 [2021-11-25 20:23:47,391 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:23:47,392 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/sv-benchmarks/c/eca-rers2012/Problem03_label55.c [2021-11-25 20:23:47,416 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/data/59cf418a6/384e9b3bb70d42bfaa5733ffeee6474c/FLAG43a3cfb61 [2021-11-25 20:23:47,494 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/data/59cf418a6/384e9b3bb70d42bfaa5733ffeee6474c [2021-11-25 20:23:47,498 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:23:47,499 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:23:47,501 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:23:47,501 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:23:47,504 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:23:47,505 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:23:47" (1/1) ... [2021-11-25 20:23:47,506 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d0d9b88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:47, skipping insertion in model container [2021-11-25 20:23:47,506 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:23:47" (1/1) ... [2021-11-25 20:23:47,513 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:23:47,588 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:23:48,247 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/sv-benchmarks/c/eca-rers2012/Problem03_label55.c[56086,56099] [2021-11-25 20:23:48,309 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:23:48,321 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:23:48,605 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/sv-benchmarks/c/eca-rers2012/Problem03_label55.c[56086,56099] [2021-11-25 20:23:48,623 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:23:48,643 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:23:48,644 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48 WrapperNode [2021-11-25 20:23:48,644 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:23:48,646 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:23:48,646 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:23:48,646 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:23:48,654 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (1/1) ... [2021-11-25 20:23:48,708 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (1/1) ... [2021-11-25 20:23:48,794 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-25 20:23:48,794 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:23:48,795 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:23:48,796 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:23:48,796 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:23:48,806 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (1/1) ... [2021-11-25 20:23:48,806 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (1/1) ... [2021-11-25 20:23:48,815 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (1/1) ... [2021-11-25 20:23:48,815 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (1/1) ... [2021-11-25 20:23:48,886 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (1/1) ... [2021-11-25 20:23:48,914 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (1/1) ... [2021-11-25 20:23:48,936 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (1/1) ... [2021-11-25 20:23:48,951 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:23:48,952 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:23:48,953 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:23:48,953 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:23:48,954 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (1/1) ... [2021-11-25 20:23:48,962 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:23:48,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:48,993 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:23:49,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:23:49,045 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:23:49,046 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:23:49,046 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:23:49,047 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:23:49,223 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:23:49,226 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:23:51,034 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:23:51,364 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:23:51,364 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 20:23:51,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:23:51 BoogieIcfgContainer [2021-11-25 20:23:51,368 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:23:51,370 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:23:51,370 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:23:51,374 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:23:51,375 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:23:47" (1/3) ... [2021-11-25 20:23:51,376 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b047249 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:23:51, skipping insertion in model container [2021-11-25 20:23:51,376 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:23:48" (2/3) ... [2021-11-25 20:23:51,376 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b047249 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:23:51, skipping insertion in model container [2021-11-25 20:23:51,376 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:23:51" (3/3) ... [2021-11-25 20:23:51,378 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label55.c [2021-11-25 20:23:51,389 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:23:51,389 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:23:51,469 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:23:51,480 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 [2021-11-25 20:23:51,480 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:23:51,513 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 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) [2021-11-25 20:23:51,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 20:23:51,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:51,546 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:51,546 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:51,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:51,554 INFO L85 PathProgramCache]: Analyzing trace with hash 209341623, now seen corresponding path program 1 times [2021-11-25 20:23:51,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:51,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670090127] [2021-11-25 20:23:51,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:51,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:51,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:52,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:52,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:52,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670090127] [2021-11-25 20:23:52,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670090127] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:23:52,257 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:23:52,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:23:52,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001508323] [2021-11-25 20:23:52,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:23:52,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:23:52,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:52,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:23:52,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:52,311 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 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 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 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) [2021-11-25 20:23:53,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:53,349 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-25 20:23:53,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:23:53,352 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 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 143 [2021-11-25 20:23:53,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:53,380 INFO L225 Difference]: With dead ends: 440 [2021-11-25 20:23:53,380 INFO L226 Difference]: Without dead ends: 289 [2021-11-25 20:23:53,385 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:53,392 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 10 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:53,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 30 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:23:53,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-25 20:23:53,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-25 20:23:53,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8923611111111112) internal successors, (545), 288 states have internal predecessors, (545), 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) [2021-11-25 20:23:53,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 545 transitions. [2021-11-25 20:23:53,494 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 545 transitions. Word has length 143 [2021-11-25 20:23:53,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:53,495 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 545 transitions. [2021-11-25 20:23:53,496 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 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) [2021-11-25 20:23:53,496 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 545 transitions. [2021-11-25 20:23:53,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-25 20:23:53,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:53,513 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:53,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:23:53,514 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:53,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:53,519 INFO L85 PathProgramCache]: Analyzing trace with hash 874733531, now seen corresponding path program 1 times [2021-11-25 20:23:53,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:53,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433905336] [2021-11-25 20:23:53,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:53,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:53,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:53,696 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:53,696 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:53,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433905336] [2021-11-25 20:23:53,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [433905336] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:23:53,697 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:23:53,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:23:53,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622987572] [2021-11-25 20:23:53,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:23:53,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:23:53,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:53,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:23:53,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:53,700 INFO L87 Difference]: Start difference. First operand 289 states and 545 transitions. Second operand has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 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) [2021-11-25 20:23:54,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:54,536 INFO L93 Difference]: Finished difference Result 863 states and 1632 transitions. [2021-11-25 20:23:54,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:23:54,546 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 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 149 [2021-11-25 20:23:54,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:54,550 INFO L225 Difference]: With dead ends: 863 [2021-11-25 20:23:54,550 INFO L226 Difference]: Without dead ends: 575 [2021-11-25 20:23:54,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:54,554 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 152 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:54,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 95 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 451 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:23:54,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-25 20:23:54,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-25 20:23:54,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.5609756097560976) internal successors, (896), 574 states have internal predecessors, (896), 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) [2021-11-25 20:23:54,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 896 transitions. [2021-11-25 20:23:54,619 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 896 transitions. Word has length 149 [2021-11-25 20:23:54,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:54,620 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 896 transitions. [2021-11-25 20:23:54,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 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) [2021-11-25 20:23:54,620 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 896 transitions. [2021-11-25 20:23:54,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-25 20:23:54,623 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:54,623 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:54,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:23:54,624 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:54,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:54,625 INFO L85 PathProgramCache]: Analyzing trace with hash -69091252, now seen corresponding path program 1 times [2021-11-25 20:23:54,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:54,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422973360] [2021-11-25 20:23:54,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:54,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:54,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:54,832 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:54,832 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:54,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422973360] [2021-11-25 20:23:54,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422973360] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:23:54,833 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:23:54,833 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:23:54,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033238802] [2021-11-25 20:23:54,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:23:54,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:23:54,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:54,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:23:54,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:54,836 INFO L87 Difference]: Start difference. First operand 575 states and 896 transitions. Second operand has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 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) [2021-11-25 20:23:55,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:55,713 INFO L93 Difference]: Finished difference Result 1723 states and 2686 transitions. [2021-11-25 20:23:55,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:23:55,714 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 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 155 [2021-11-25 20:23:55,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:55,722 INFO L225 Difference]: With dead ends: 1723 [2021-11-25 20:23:55,722 INFO L226 Difference]: Without dead ends: 1149 [2021-11-25 20:23:55,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:55,727 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 168 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 553 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:55,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 107 Invalid, 616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 553 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:23:55,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-11-25 20:23:55,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 1147. [2021-11-25 20:23:55,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.4825479930191972) internal successors, (1699), 1146 states have internal predecessors, (1699), 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) [2021-11-25 20:23:55,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1699 transitions. [2021-11-25 20:23:55,792 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1699 transitions. Word has length 155 [2021-11-25 20:23:55,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:55,794 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1699 transitions. [2021-11-25 20:23:55,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 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) [2021-11-25 20:23:55,794 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1699 transitions. [2021-11-25 20:23:55,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-25 20:23:55,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:55,800 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:55,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 20:23:55,800 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:55,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:55,801 INFO L85 PathProgramCache]: Analyzing trace with hash 836227386, now seen corresponding path program 1 times [2021-11-25 20:23:55,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:55,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70985818] [2021-11-25 20:23:55,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:55,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:55,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:55,939 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:23:55,940 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:55,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70985818] [2021-11-25 20:23:55,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70985818] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:23:55,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:23:55,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:23:55,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917339521] [2021-11-25 20:23:55,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:23:55,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:23:55,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:55,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:23:55,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:55,945 INFO L87 Difference]: Start difference. First operand 1147 states and 1699 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 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) [2021-11-25 20:23:56,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:56,818 INFO L93 Difference]: Finished difference Result 3437 states and 5094 transitions. [2021-11-25 20:23:56,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:23:56,819 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 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 157 [2021-11-25 20:23:56,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:56,838 INFO L225 Difference]: With dead ends: 3437 [2021-11-25 20:23:56,838 INFO L226 Difference]: Without dead ends: 2291 [2021-11-25 20:23:56,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:56,842 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 159 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:56,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 23 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:23:56,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2291 states. [2021-11-25 20:23:56,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2291 to 2291. [2021-11-25 20:23:56,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 1.4480349344978165) internal successors, (3316), 2290 states have internal predecessors, (3316), 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) [2021-11-25 20:23:56,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 3316 transitions. [2021-11-25 20:23:56,917 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 3316 transitions. Word has length 157 [2021-11-25 20:23:56,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:56,917 INFO L470 AbstractCegarLoop]: Abstraction has 2291 states and 3316 transitions. [2021-11-25 20:23:56,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 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) [2021-11-25 20:23:56,918 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 3316 transitions. [2021-11-25 20:23:56,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-25 20:23:56,925 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:56,925 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:56,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 20:23:56,926 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:56,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:56,927 INFO L85 PathProgramCache]: Analyzing trace with hash 303763199, now seen corresponding path program 1 times [2021-11-25 20:23:56,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:56,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434349128] [2021-11-25 20:23:56,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:56,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:56,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:57,017 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:23:57,017 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:57,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434349128] [2021-11-25 20:23:57,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1434349128] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:23:57,018 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:23:57,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:23:57,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994689300] [2021-11-25 20:23:57,019 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:23:57,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:23:57,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:57,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:23:57,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:57,021 INFO L87 Difference]: Start difference. First operand 2291 states and 3316 transitions. Second operand has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 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) [2021-11-25 20:23:57,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:57,891 INFO L93 Difference]: Finished difference Result 5725 states and 8585 transitions. [2021-11-25 20:23:57,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:23:57,891 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 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 164 [2021-11-25 20:23:57,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:57,914 INFO L225 Difference]: With dead ends: 5725 [2021-11-25 20:23:57,914 INFO L226 Difference]: Without dead ends: 3435 [2021-11-25 20:23:57,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:57,919 INFO L933 BasicCegarLoop]: 254 mSDtfsCounter, 150 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:57,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 258 Invalid, 571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 408 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:23:57,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-25 20:23:58,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-25 20:23:58,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.36924868957484) internal successors, (4702), 3434 states have internal predecessors, (4702), 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) [2021-11-25 20:23:58,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4702 transitions. [2021-11-25 20:23:58,026 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4702 transitions. Word has length 164 [2021-11-25 20:23:58,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:58,027 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4702 transitions. [2021-11-25 20:23:58,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 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) [2021-11-25 20:23:58,027 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4702 transitions. [2021-11-25 20:23:58,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-25 20:23:58,035 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:58,036 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:58,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 20:23:58,036 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:58,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:58,037 INFO L85 PathProgramCache]: Analyzing trace with hash 610400796, now seen corresponding path program 1 times [2021-11-25 20:23:58,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:58,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228721686] [2021-11-25 20:23:58,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:58,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:58,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:58,141 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 20:23:58,142 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:58,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228721686] [2021-11-25 20:23:58,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1228721686] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:23:58,142 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:23:58,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:23:58,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992547768] [2021-11-25 20:23:58,143 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:23:58,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:23:58,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:58,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:23:58,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:58,145 INFO L87 Difference]: Start difference. First operand 3435 states and 4702 transitions. Second operand has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 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) [2021-11-25 20:23:58,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:58,622 INFO L93 Difference]: Finished difference Result 6869 states and 9403 transitions. [2021-11-25 20:23:58,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:23:58,622 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 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 176 [2021-11-25 20:23:58,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:58,641 INFO L225 Difference]: With dead ends: 6869 [2021-11-25 20:23:58,641 INFO L226 Difference]: Without dead ends: 3435 [2021-11-25 20:23:58,646 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:23:58,647 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 240 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:58,648 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 4 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:23:58,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-25 20:23:58,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-25 20:23:58,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.320326150262085) internal successors, (4534), 3434 states have internal predecessors, (4534), 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) [2021-11-25 20:23:58,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4534 transitions. [2021-11-25 20:23:58,772 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4534 transitions. Word has length 176 [2021-11-25 20:23:58,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:58,773 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4534 transitions. [2021-11-25 20:23:58,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 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) [2021-11-25 20:23:58,774 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4534 transitions. [2021-11-25 20:23:58,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-11-25 20:23:58,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:58,781 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:58,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 20:23:58,782 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:58,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:58,783 INFO L85 PathProgramCache]: Analyzing trace with hash 2077845564, now seen corresponding path program 1 times [2021-11-25 20:23:58,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:58,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369563638] [2021-11-25 20:23:58,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:58,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:58,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:58,923 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 69 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:23:58,923 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:58,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369563638] [2021-11-25 20:23:58,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369563638] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:23:58,924 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:23:58,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:23:58,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907388809] [2021-11-25 20:23:58,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:23:58,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:23:58,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:58,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:23:58,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:23:58,927 INFO L87 Difference]: Start difference. First operand 3435 states and 4534 transitions. Second operand has 4 states, 4 states have (on average 48.5) internal successors, (194), 3 states have internal predecessors, (194), 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) [2021-11-25 20:23:59,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:59,800 INFO L93 Difference]: Finished difference Result 8585 states and 11411 transitions. [2021-11-25 20:23:59,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:23:59,800 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 48.5) internal successors, (194), 3 states have internal predecessors, (194), 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 199 [2021-11-25 20:23:59,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:59,827 INFO L225 Difference]: With dead ends: 8585 [2021-11-25 20:23:59,827 INFO L226 Difference]: Without dead ends: 5151 [2021-11-25 20:23:59,832 INFO L932 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 [2021-11-25 20:23:59,833 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 422 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 607 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 607 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:59,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [422 Valid, 11 Invalid, 779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 607 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:23:59,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5151 states. [2021-11-25 20:23:59,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5151 to 5151. [2021-11-25 20:23:59,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5151 states, 5150 states have (on average 1.2741747572815534) internal successors, (6562), 5150 states have internal predecessors, (6562), 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) [2021-11-25 20:24:00,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5151 states to 5151 states and 6562 transitions. [2021-11-25 20:24:00,002 INFO L78 Accepts]: Start accepts. Automaton has 5151 states and 6562 transitions. Word has length 199 [2021-11-25 20:24:00,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:00,003 INFO L470 AbstractCegarLoop]: Abstraction has 5151 states and 6562 transitions. [2021-11-25 20:24:00,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 48.5) internal successors, (194), 3 states have internal predecessors, (194), 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) [2021-11-25 20:24:00,003 INFO L276 IsEmpty]: Start isEmpty. Operand 5151 states and 6562 transitions. [2021-11-25 20:24:00,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2021-11-25 20:24:00,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:00,015 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:00,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 20:24:00,015 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:00,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:00,016 INFO L85 PathProgramCache]: Analyzing trace with hash 1430663644, now seen corresponding path program 1 times [2021-11-25 20:24:00,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:00,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525711396] [2021-11-25 20:24:00,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:00,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:00,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:00,139 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 92 proven. 0 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-25 20:24:00,139 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:00,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525711396] [2021-11-25 20:24:00,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525711396] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:24:00,140 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:24:00,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:24:00,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836207333] [2021-11-25 20:24:00,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:24:00,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:24:00,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:00,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:24:00,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:24:00,142 INFO L87 Difference]: Start difference. First operand 5151 states and 6562 transitions. Second operand has 4 states, 4 states have (on average 41.75) internal successors, (167), 3 states have internal predecessors, (167), 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) [2021-11-25 20:24:01,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:01,568 INFO L93 Difference]: Finished difference Result 20601 states and 26245 transitions. [2021-11-25 20:24:01,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:24:01,568 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 41.75) internal successors, (167), 3 states have internal predecessors, (167), 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 223 [2021-11-25 20:24:01,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:01,655 INFO L225 Difference]: With dead ends: 20601 [2021-11-25 20:24:01,655 INFO L226 Difference]: Without dead ends: 15451 [2021-11-25 20:24:01,668 INFO L932 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 [2021-11-25 20:24:01,670 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 396 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 959 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 1084 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 959 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:01,670 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [396 Valid, 19 Invalid, 1084 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 959 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-25 20:24:01,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15451 states. [2021-11-25 20:24:02,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15451 to 15447. [2021-11-25 20:24:02,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15447 states, 15446 states have (on average 1.2685484915188399) internal successors, (19594), 15446 states have internal predecessors, (19594), 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) [2021-11-25 20:24:02,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15447 states to 15447 states and 19594 transitions. [2021-11-25 20:24:02,283 INFO L78 Accepts]: Start accepts. Automaton has 15447 states and 19594 transitions. Word has length 223 [2021-11-25 20:24:02,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:02,288 INFO L470 AbstractCegarLoop]: Abstraction has 15447 states and 19594 transitions. [2021-11-25 20:24:02,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 41.75) internal successors, (167), 3 states have internal predecessors, (167), 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) [2021-11-25 20:24:02,290 INFO L276 IsEmpty]: Start isEmpty. Operand 15447 states and 19594 transitions. [2021-11-25 20:24:02,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2021-11-25 20:24:02,306 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:02,308 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:02,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 20:24:02,308 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:02,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:02,309 INFO L85 PathProgramCache]: Analyzing trace with hash 888791995, now seen corresponding path program 1 times [2021-11-25 20:24:02,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:02,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453665595] [2021-11-25 20:24:02,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:02,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:02,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:02,457 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-11-25 20:24:02,458 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:02,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453665595] [2021-11-25 20:24:02,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1453665595] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:24:02,458 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:24:02,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:24:02,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888497489] [2021-11-25 20:24:02,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:24:02,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:24:02,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:02,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:24:02,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:24:02,462 INFO L87 Difference]: Start difference. First operand 15447 states and 19594 transitions. Second operand has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 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) [2021-11-25 20:24:03,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:03,479 INFO L93 Difference]: Finished difference Result 39759 states and 49908 transitions. [2021-11-25 20:24:03,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:24:03,480 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 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 242 [2021-11-25 20:24:03,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:03,538 INFO L225 Difference]: With dead ends: 39759 [2021-11-25 20:24:03,538 INFO L226 Difference]: Without dead ends: 24313 [2021-11-25 20:24:03,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:24:03,555 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 134 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:03,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 70 Invalid, 586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:24:03,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24313 states. [2021-11-25 20:24:04,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24313 to 22454. [2021-11-25 20:24:04,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22454 states, 22453 states have (on average 1.2466485547588295) internal successors, (27991), 22453 states have internal predecessors, (27991), 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) [2021-11-25 20:24:04,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22454 states to 22454 states and 27991 transitions. [2021-11-25 20:24:04,328 INFO L78 Accepts]: Start accepts. Automaton has 22454 states and 27991 transitions. Word has length 242 [2021-11-25 20:24:04,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:04,328 INFO L470 AbstractCegarLoop]: Abstraction has 22454 states and 27991 transitions. [2021-11-25 20:24:04,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 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) [2021-11-25 20:24:04,329 INFO L276 IsEmpty]: Start isEmpty. Operand 22454 states and 27991 transitions. [2021-11-25 20:24:04,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-25 20:24:04,351 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:04,351 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:04,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 20:24:04,352 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:04,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:04,353 INFO L85 PathProgramCache]: Analyzing trace with hash 1937884196, now seen corresponding path program 1 times [2021-11-25 20:24:04,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:04,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839728676] [2021-11-25 20:24:04,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:04,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:04,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:04,714 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 108 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:24:04,714 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:04,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839728676] [2021-11-25 20:24:04,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839728676] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:04,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551706235] [2021-11-25 20:24:04,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:04,715 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:04,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:24:04,721 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:24:04,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:24:04,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:04,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:24:04,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:05,698 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:24:05,698 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:24:05,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551706235] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:24:05,699 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:24:05,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 20:24:05,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667063525] [2021-11-25 20:24:05,699 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:24:05,700 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:24:05,700 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:05,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:24:05,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:24:05,701 INFO L87 Difference]: Start difference. First operand 22454 states and 27991 transitions. Second operand has 3 states, 3 states have (on average 80.33333333333333) internal successors, (241), 3 states have internal predecessors, (241), 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) [2021-11-25 20:24:06,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:06,727 INFO L93 Difference]: Finished difference Result 49340 states and 62806 transitions. [2021-11-25 20:24:06,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:24:06,728 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 80.33333333333333) internal successors, (241), 3 states have internal predecessors, (241), 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 249 [2021-11-25 20:24:06,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:06,795 INFO L225 Difference]: With dead ends: 49340 [2021-11-25 20:24:06,795 INFO L226 Difference]: Without dead ends: 26887 [2021-11-25 20:24:06,818 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:24:06,819 INFO L933 BasicCegarLoop]: 185 mSDtfsCounter, 39 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:06,820 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 189 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:24:06,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26887 states. [2021-11-25 20:24:07,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26887 to 26887. [2021-11-25 20:24:07,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26887 states, 26886 states have (on average 1.2797366659227851) internal successors, (34407), 26886 states have internal predecessors, (34407), 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) [2021-11-25 20:24:07,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26887 states to 26887 states and 34407 transitions. [2021-11-25 20:24:07,672 INFO L78 Accepts]: Start accepts. Automaton has 26887 states and 34407 transitions. Word has length 249 [2021-11-25 20:24:07,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:07,672 INFO L470 AbstractCegarLoop]: Abstraction has 26887 states and 34407 transitions. [2021-11-25 20:24:07,673 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 80.33333333333333) internal successors, (241), 3 states have internal predecessors, (241), 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) [2021-11-25 20:24:07,673 INFO L276 IsEmpty]: Start isEmpty. Operand 26887 states and 34407 transitions. [2021-11-25 20:24:07,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 260 [2021-11-25 20:24:07,698 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:07,698 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:07,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:07,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:24:07,922 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:07,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:07,922 INFO L85 PathProgramCache]: Analyzing trace with hash 1571747164, now seen corresponding path program 1 times [2021-11-25 20:24:07,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:07,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447474547] [2021-11-25 20:24:07,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:07,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:08,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:08,086 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 146 proven. 0 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2021-11-25 20:24:08,087 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:08,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447474547] [2021-11-25 20:24:08,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [447474547] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:24:08,087 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:24:08,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:24:08,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81470683] [2021-11-25 20:24:08,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:24:08,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:24:08,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:08,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:24:08,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:24:08,183 INFO L87 Difference]: Start difference. First operand 26887 states and 34407 transitions. Second operand has 4 states, 4 states have (on average 46.25) internal successors, (185), 3 states have internal predecessors, (185), 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) [2021-11-25 20:24:09,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:09,812 INFO L93 Difference]: Finished difference Result 82947 states and 105870 transitions. [2021-11-25 20:24:09,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:24:09,813 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 46.25) internal successors, (185), 3 states have internal predecessors, (185), 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 259 [2021-11-25 20:24:09,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:09,958 INFO L225 Difference]: With dead ends: 82947 [2021-11-25 20:24:09,959 INFO L226 Difference]: Without dead ends: 56061 [2021-11-25 20:24:09,988 INFO L932 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 [2021-11-25 20:24:09,990 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 381 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 621 mSolverCounterSat, 237 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 381 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 858 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:09,990 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [381 Valid, 272 Invalid, 858 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 621 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 20:24:10,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56061 states. [2021-11-25 20:24:11,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56061 to 56059. [2021-11-25 20:24:11,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56059 states, 56058 states have (on average 1.2594098968925043) internal successors, (70600), 56058 states have internal predecessors, (70600), 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) [2021-11-25 20:24:11,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56059 states to 56059 states and 70600 transitions. [2021-11-25 20:24:11,836 INFO L78 Accepts]: Start accepts. Automaton has 56059 states and 70600 transitions. Word has length 259 [2021-11-25 20:24:11,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:11,837 INFO L470 AbstractCegarLoop]: Abstraction has 56059 states and 70600 transitions. [2021-11-25 20:24:11,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 46.25) internal successors, (185), 3 states have internal predecessors, (185), 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) [2021-11-25 20:24:11,838 INFO L276 IsEmpty]: Start isEmpty. Operand 56059 states and 70600 transitions. [2021-11-25 20:24:11,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-25 20:24:11,881 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:11,881 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:11,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-25 20:24:11,882 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:11,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:11,883 INFO L85 PathProgramCache]: Analyzing trace with hash -1561383851, now seen corresponding path program 1 times [2021-11-25 20:24:11,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:11,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259463334] [2021-11-25 20:24:11,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:11,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:11,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:12,205 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 121 proven. 3 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 20:24:12,205 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:12,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259463334] [2021-11-25 20:24:12,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259463334] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:12,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358323467] [2021-11-25 20:24:12,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:12,206 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:12,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:24:12,209 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:24:12,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:24:12,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:12,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:24:12,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:13,008 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 118 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:24:13,008 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:24:13,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358323467] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:24:13,009 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:24:13,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 20:24:13,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69356254] [2021-11-25 20:24:13,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:24:13,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:24:13,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:13,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:24:13,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:24:13,011 INFO L87 Difference]: Start difference. First operand 56059 states and 70600 transitions. Second operand has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 3 states have internal predecessors, (242), 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) [2021-11-25 20:24:14,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:14,580 INFO L93 Difference]: Finished difference Result 135569 states and 170785 transitions. [2021-11-25 20:24:14,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:24:14,581 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 3 states have internal predecessors, (242), 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 262 [2021-11-25 20:24:14,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:14,740 INFO L225 Difference]: With dead ends: 135569 [2021-11-25 20:24:14,740 INFO L226 Difference]: Without dead ends: 80083 [2021-11-25 20:24:14,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:24:14,772 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 34 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 473 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:14,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 60 Invalid, 544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 473 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:24:14,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80083 states. [2021-11-25 20:24:16,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80083 to 78796. [2021-11-25 20:24:16,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78796 states, 78795 states have (on average 1.2329208706136177) internal successors, (97148), 78795 states have internal predecessors, (97148), 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) [2021-11-25 20:24:16,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78796 states to 78796 states and 97148 transitions. [2021-11-25 20:24:16,539 INFO L78 Accepts]: Start accepts. Automaton has 78796 states and 97148 transitions. Word has length 262 [2021-11-25 20:24:16,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:16,540 INFO L470 AbstractCegarLoop]: Abstraction has 78796 states and 97148 transitions. [2021-11-25 20:24:16,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 3 states have internal predecessors, (242), 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) [2021-11-25 20:24:16,541 INFO L276 IsEmpty]: Start isEmpty. Operand 78796 states and 97148 transitions. [2021-11-25 20:24:16,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2021-11-25 20:24:16,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:16,585 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:16,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:16,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:24:16,814 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:16,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:16,815 INFO L85 PathProgramCache]: Analyzing trace with hash -207108181, now seen corresponding path program 1 times [2021-11-25 20:24:16,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:16,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104553754] [2021-11-25 20:24:16,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:16,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:16,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:17,466 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 162 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:24:17,466 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:17,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104553754] [2021-11-25 20:24:17,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104553754] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:24:17,467 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:24:17,467 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:24:17,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148058007] [2021-11-25 20:24:17,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:24:17,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:24:17,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:17,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:24:17,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:24:17,470 INFO L87 Difference]: Start difference. First operand 78796 states and 97148 transitions. Second operand has 3 states, 3 states have (on average 95.66666666666667) internal successors, (287), 3 states have internal predecessors, (287), 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) [2021-11-25 20:24:19,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:19,015 INFO L93 Difference]: Finished difference Result 171462 states and 211035 transitions. [2021-11-25 20:24:19,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:24:19,016 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 95.66666666666667) internal successors, (287), 3 states have internal predecessors, (287), 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 292 [2021-11-25 20:24:19,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:19,104 INFO L225 Difference]: With dead ends: 171462 [2021-11-25 20:24:19,104 INFO L226 Difference]: Without dead ends: 93239 [2021-11-25 20:24:19,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:24:19,136 INFO L933 BasicCegarLoop]: 240 mSDtfsCounter, 15 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 415 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 536 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:19,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 243 Invalid, 536 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 415 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:24:19,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93239 states. [2021-11-25 20:24:20,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93239 to 92524. [2021-11-25 20:24:20,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92524 states, 92523 states have (on average 1.2101855754785296) internal successors, (111970), 92523 states have internal predecessors, (111970), 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) [2021-11-25 20:24:21,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92524 states to 92524 states and 111970 transitions. [2021-11-25 20:24:21,172 INFO L78 Accepts]: Start accepts. Automaton has 92524 states and 111970 transitions. Word has length 292 [2021-11-25 20:24:21,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:21,173 INFO L470 AbstractCegarLoop]: Abstraction has 92524 states and 111970 transitions. [2021-11-25 20:24:21,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 95.66666666666667) internal successors, (287), 3 states have internal predecessors, (287), 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) [2021-11-25 20:24:21,173 INFO L276 IsEmpty]: Start isEmpty. Operand 92524 states and 111970 transitions. [2021-11-25 20:24:21,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2021-11-25 20:24:21,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:21,211 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:21,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-25 20:24:21,211 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:21,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:21,212 INFO L85 PathProgramCache]: Analyzing trace with hash 1523539312, now seen corresponding path program 1 times [2021-11-25 20:24:21,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:21,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874878390] [2021-11-25 20:24:21,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:21,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:21,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:21,479 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 194 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:24:21,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:21,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874878390] [2021-11-25 20:24:21,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874878390] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:24:21,480 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:24:21,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:24:21,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636763556] [2021-11-25 20:24:21,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:24:21,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:24:21,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:21,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:24:21,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:24:21,485 INFO L87 Difference]: Start difference. First operand 92524 states and 111970 transitions. Second operand has 4 states, 4 states have (on average 77.0) internal successors, (308), 3 states have internal predecessors, (308), 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) [2021-11-25 20:24:23,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:23,570 INFO L93 Difference]: Finished difference Result 186620 states and 225749 transitions. [2021-11-25 20:24:23,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:24:23,570 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 77.0) internal successors, (308), 3 states have internal predecessors, (308), 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 308 [2021-11-25 20:24:23,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:23,691 INFO L225 Difference]: With dead ends: 186620 [2021-11-25 20:24:23,691 INFO L226 Difference]: Without dead ends: 94812 [2021-11-25 20:24:23,741 INFO L932 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 [2021-11-25 20:24:23,741 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 135 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 844 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 1005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 844 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:23,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 63 Invalid, 1005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 844 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-25 20:24:23,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94812 states. [2021-11-25 20:24:25,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94812 to 92095. [2021-11-25 20:24:25,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92095 states, 92094 states have (on average 1.2099050969661433) internal successors, (111425), 92094 states have internal predecessors, (111425), 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) [2021-11-25 20:24:25,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92095 states to 92095 states and 111425 transitions. [2021-11-25 20:24:25,621 INFO L78 Accepts]: Start accepts. Automaton has 92095 states and 111425 transitions. Word has length 308 [2021-11-25 20:24:25,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:25,622 INFO L470 AbstractCegarLoop]: Abstraction has 92095 states and 111425 transitions. [2021-11-25 20:24:25,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 77.0) internal successors, (308), 3 states have internal predecessors, (308), 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) [2021-11-25 20:24:25,622 INFO L276 IsEmpty]: Start isEmpty. Operand 92095 states and 111425 transitions. [2021-11-25 20:24:25,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2021-11-25 20:24:25,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:25,640 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:25,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-25 20:24:25,640 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:25,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:25,641 INFO L85 PathProgramCache]: Analyzing trace with hash 1407130299, now seen corresponding path program 1 times [2021-11-25 20:24:25,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:25,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [627694664] [2021-11-25 20:24:25,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:25,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:25,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:26,375 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 169 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:24:26,375 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:26,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [627694664] [2021-11-25 20:24:26,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [627694664] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:26,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671638016] [2021-11-25 20:24:26,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:26,376 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:26,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:24:26,393 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:24:26,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:24:26,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:26,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:24:26,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:27,571 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 217 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:24:27,571 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:24:27,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671638016] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:24:27,572 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:24:27,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 7 [2021-11-25 20:24:27,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41022367] [2021-11-25 20:24:27,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:24:27,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:24:27,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:27,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:24:27,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:24:27,575 INFO L87 Difference]: Start difference. First operand 92095 states and 111425 transitions. Second operand has 4 states, 4 states have (on average 77.0) internal successors, (308), 4 states have internal predecessors, (308), 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) [2021-11-25 20:24:29,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:29,514 INFO L93 Difference]: Finished difference Result 202779 states and 244505 transitions. [2021-11-25 20:24:29,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:24:29,514 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 77.0) internal successors, (308), 4 states have internal predecessors, (308), 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 313 [2021-11-25 20:24:29,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:29,671 INFO L225 Difference]: With dead ends: 202779 [2021-11-25 20:24:29,671 INFO L226 Difference]: Without dead ends: 111400 [2021-11-25 20:24:30,197 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 311 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:24:30,201 INFO L933 BasicCegarLoop]: 184 mSDtfsCounter, 225 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 795 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 1010 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:30,201 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 194 Invalid, 1010 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 795 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 20:24:30,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111400 states. [2021-11-25 20:24:31,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111400 to 105108. [2021-11-25 20:24:31,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105108 states, 105107 states have (on average 1.171977128069491) internal successors, (123183), 105107 states have internal predecessors, (123183), 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) [2021-11-25 20:24:32,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105108 states to 105108 states and 123183 transitions. [2021-11-25 20:24:32,082 INFO L78 Accepts]: Start accepts. Automaton has 105108 states and 123183 transitions. Word has length 313 [2021-11-25 20:24:32,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:32,082 INFO L470 AbstractCegarLoop]: Abstraction has 105108 states and 123183 transitions. [2021-11-25 20:24:32,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 77.0) internal successors, (308), 4 states have internal predecessors, (308), 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) [2021-11-25 20:24:32,083 INFO L276 IsEmpty]: Start isEmpty. Operand 105108 states and 123183 transitions. [2021-11-25 20:24:32,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2021-11-25 20:24:32,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:32,104 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:32,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:32,313 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:32,314 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:32,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:32,314 INFO L85 PathProgramCache]: Analyzing trace with hash 1254474251, now seen corresponding path program 1 times [2021-11-25 20:24:32,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:32,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047394292] [2021-11-25 20:24:32,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:32,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:32,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:32,480 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 74 proven. 6 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-25 20:24:32,480 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:32,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047394292] [2021-11-25 20:24:32,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2047394292] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:32,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161958082] [2021-11-25 20:24:32,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:32,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:32,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:24:32,489 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:24:32,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:24:33,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:33,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 573 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:24:33,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:34,058 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-25 20:24:34,058 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:24:34,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161958082] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:24:34,059 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:24:34,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 20:24:34,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362282187] [2021-11-25 20:24:34,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:24:34,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:24:34,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:34,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:24:34,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:24:34,062 INFO L87 Difference]: Start difference. First operand 105108 states and 123183 transitions. Second operand has 4 states, 4 states have (on average 45.5) internal successors, (182), 3 states have internal predecessors, (182), 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) [2021-11-25 20:24:35,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:35,891 INFO L93 Difference]: Finished difference Result 211218 states and 247443 transitions. [2021-11-25 20:24:35,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:24:35,892 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 45.5) internal successors, (182), 3 states have internal predecessors, (182), 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 315 [2021-11-25 20:24:35,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:36,039 INFO L225 Difference]: With dead ends: 211218 [2021-11-25 20:24:36,039 INFO L226 Difference]: Without dead ends: 106111 [2021-11-25 20:24:36,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 313 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:24:36,092 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 354 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 857 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:36,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [354 Valid, 285 Invalid, 857 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 20:24:36,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106111 states. [2021-11-25 20:24:38,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106111 to 105966. [2021-11-25 20:24:38,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105966 states, 105965 states have (on average 1.1672722125230028) internal successors, (123690), 105965 states have internal predecessors, (123690), 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) [2021-11-25 20:24:38,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105966 states to 105966 states and 123690 transitions. [2021-11-25 20:24:38,720 INFO L78 Accepts]: Start accepts. Automaton has 105966 states and 123690 transitions. Word has length 315 [2021-11-25 20:24:38,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:38,720 INFO L470 AbstractCegarLoop]: Abstraction has 105966 states and 123690 transitions. [2021-11-25 20:24:38,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 45.5) internal successors, (182), 3 states have internal predecessors, (182), 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) [2021-11-25 20:24:38,721 INFO L276 IsEmpty]: Start isEmpty. Operand 105966 states and 123690 transitions. [2021-11-25 20:24:38,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2021-11-25 20:24:38,751 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:38,752 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:38,801 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:38,977 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:24:38,978 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:38,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:38,978 INFO L85 PathProgramCache]: Analyzing trace with hash 1791140274, now seen corresponding path program 1 times [2021-11-25 20:24:38,978 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:38,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757293885] [2021-11-25 20:24:38,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:38,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:39,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:39,256 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 203 proven. 82 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:24:39,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:39,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757293885] [2021-11-25 20:24:39,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757293885] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:39,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51663960] [2021-11-25 20:24:39,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:39,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:39,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:24:39,259 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:24:39,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87a5a848-3243-4261-82dc-12291ae527c1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:24:39,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:39,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:24:39,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:40,388 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 243 proven. 40 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-25 20:24:40,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:24:41,728 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 243 proven. 40 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-25 20:24:41,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51663960] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:24:41,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1814413035] [2021-11-25 20:24:41,769 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-25 20:24:41,769 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:24:41,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:24:41,782 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:24:41,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs