./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../../sv-benchmarks/c/heap-manipulation/dll_of_dll-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/heap-manipulation/dll_of_dll-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/config/svcomp-MemCleanup-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0eca46c14885d62179341dcc13b398752af03e020a80dcf533f4c9afc7372707 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:29:32,985 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:29:32,988 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:29:33,044 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:29:33,044 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:29:33,049 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:29:33,051 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:29:33,056 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:29:33,059 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:29:33,067 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:29:33,068 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:29:33,070 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:29:33,071 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:29:33,074 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:29:33,077 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:29:33,086 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:29:33,087 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:29:33,088 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:29:33,090 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:29:33,092 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:29:33,094 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:29:33,097 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:29:33,100 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:29:33,101 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:29:33,115 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:29:33,115 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:29:33,116 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:29:33,118 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:29:33,119 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:29:33,120 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:29:33,120 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:29:33,121 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:29:33,123 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:29:33,124 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:29:33,126 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:29:33,126 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:29:33,127 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:29:33,127 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:29:33,127 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:29:33,128 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:29:33,129 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:29:33,130 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/config/svcomp-MemCleanup-32bit-Taipan_Default.epf [2021-11-23 03:29:33,179 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:29:33,179 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:29:33,180 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:29:33,180 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:29:33,181 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:29:33,181 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:29:33,181 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:29:33,182 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:29:33,182 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:29:33,182 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:29:33,183 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:29:33,183 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:29:33,183 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:29:33,184 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:29:33,184 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:29:33,184 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:29:33,184 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:29:33,184 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:29:33,185 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 03:29:33,185 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 03:29:33,186 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:29:33,186 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:29:33,186 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-23 03:29:33,187 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:29:33,188 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:29:33,188 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:29:33,188 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-23 03:29:33,188 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-23 03:29:33,188 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:29:33,189 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 03:29:33,189 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:29:33,189 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:29:33,189 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:29:33,189 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:29:33,190 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:29:33,190 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:29:33,190 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:29:33,190 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:29:33,190 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:29:33,191 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:29:33,191 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:29:33,191 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_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0eca46c14885d62179341dcc13b398752af03e020a80dcf533f4c9afc7372707 [2021-11-23 03:29:33,438 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:29:33,463 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:29:33,465 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:29:33,467 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:29:33,467 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:29:33,469 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/heap-manipulation/dll_of_dll-2.i [2021-11-23 03:29:33,551 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/data/8adcd2085/0bc95b4bd7414416be7be94160b3fb88/FLAG7be8a0ac9 [2021-11-23 03:29:34,096 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:29:34,096 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/sv-benchmarks/c/heap-manipulation/dll_of_dll-2.i [2021-11-23 03:29:34,111 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/data/8adcd2085/0bc95b4bd7414416be7be94160b3fb88/FLAG7be8a0ac9 [2021-11-23 03:29:34,402 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/data/8adcd2085/0bc95b4bd7414416be7be94160b3fb88 [2021-11-23 03:29:34,404 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:29:34,406 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:29:34,410 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:29:34,410 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:29:34,414 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:29:34,414 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:29:34" (1/1) ... [2021-11-23 03:29:34,415 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31a2e9cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:34, skipping insertion in model container [2021-11-23 03:29:34,416 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:29:34" (1/1) ... [2021-11-23 03:29:34,426 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:29:34,478 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:29:34,841 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_3c980cbd-924a-424d-8c66-586823d7f405/sv-benchmarks/c/heap-manipulation/dll_of_dll-2.i[22634,22647] [2021-11-23 03:29:34,929 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:29:34,940 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:29:34,995 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_3c980cbd-924a-424d-8c66-586823d7f405/sv-benchmarks/c/heap-manipulation/dll_of_dll-2.i[22634,22647] [2021-11-23 03:29:35,032 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:29:35,080 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:29:35,080 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35 WrapperNode [2021-11-23 03:29:35,081 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:29:35,082 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:29:35,082 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:29:35,082 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:29:35,090 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (1/1) ... [2021-11-23 03:29:35,127 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (1/1) ... [2021-11-23 03:29:35,183 INFO L137 Inliner]: procedures = 140, calls = 94, calls flagged for inlining = 13, calls inlined = 13, statements flattened = 234 [2021-11-23 03:29:35,184 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:29:35,186 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:29:35,186 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:29:35,186 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:29:35,195 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (1/1) ... [2021-11-23 03:29:35,196 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (1/1) ... [2021-11-23 03:29:35,213 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (1/1) ... [2021-11-23 03:29:35,216 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (1/1) ... [2021-11-23 03:29:35,230 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (1/1) ... [2021-11-23 03:29:35,238 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (1/1) ... [2021-11-23 03:29:35,241 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (1/1) ... [2021-11-23 03:29:35,245 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:29:35,246 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:29:35,246 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:29:35,247 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:29:35,248 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (1/1) ... [2021-11-23 03:29:35,255 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:29:35,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:29:35,288 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:29:35,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:29:35,332 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2021-11-23 03:29:35,332 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2021-11-23 03:29:35,333 INFO L130 BoogieDeclarations]: Found specification of procedure inspect_base [2021-11-23 03:29:35,333 INFO L138 BoogieDeclarations]: Found implementation of procedure inspect_base [2021-11-23 03:29:35,333 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 03:29:35,333 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:29:35,333 INFO L130 BoogieDeclarations]: Found specification of procedure dll_insert_master [2021-11-23 03:29:35,334 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_insert_master [2021-11-23 03:29:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 03:29:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 03:29:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~TO~VOID [2021-11-23 03:29:35,334 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~TO~VOID [2021-11-23 03:29:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 03:29:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 03:29:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-23 03:29:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create_generic [2021-11-23 03:29:35,335 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create_generic [2021-11-23 03:29:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create_slave [2021-11-23 03:29:35,336 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create_slave [2021-11-23 03:29:35,336 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:29:35,336 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:29:35,336 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:29:35,473 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:29:35,475 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:29:36,210 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:29:36,314 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:29:36,314 INFO L301 CfgBuilder]: Removed 38 assume(true) statements. [2021-11-23 03:29:36,318 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:29:36 BoogieIcfgContainer [2021-11-23 03:29:36,318 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:29:36,321 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:29:36,322 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:29:36,325 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:29:36,326 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:29:34" (1/3) ... [2021-11-23 03:29:36,327 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7146902d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:29:36, skipping insertion in model container [2021-11-23 03:29:36,327 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:35" (2/3) ... [2021-11-23 03:29:36,328 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7146902d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:29:36, skipping insertion in model container [2021-11-23 03:29:36,328 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:29:36" (3/3) ... [2021-11-23 03:29:36,329 INFO L111 eAbstractionObserver]: Analyzing ICFG dll_of_dll-2.i [2021-11-23 03:29:36,341 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:29:36,341 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 98 error locations. [2021-11-23 03:29:36,388 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:29:36,396 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:29:36,397 INFO L340 AbstractCegarLoop]: Starting to check reachability of 98 error locations. [2021-11-23 03:29:36,422 INFO L276 IsEmpty]: Start isEmpty. Operand has 232 states, 103 states have (on average 2.495145631067961) internal successors, (257), 220 states have internal predecessors, (257), 24 states have call successors, (24), 6 states have call predecessors, (24), 6 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-23 03:29:36,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 03:29:36,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:36,431 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:36,432 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ##fun~$Pointer$~TO~VOIDErr0REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:36,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:36,438 INFO L85 PathProgramCache]: Analyzing trace with hash 691826204, now seen corresponding path program 1 times [2021-11-23 03:29:36,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:36,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185514105] [2021-11-23 03:29:36,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:36,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:36,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:36,661 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:36,661 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:36,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185514105] [2021-11-23 03:29:36,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185514105] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:36,662 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:36,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:29:36,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671956175] [2021-11-23 03:29:36,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:36,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:36,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:36,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:36,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:36,702 INFO L87 Difference]: Start difference. First operand has 232 states, 103 states have (on average 2.495145631067961) internal successors, (257), 220 states have internal predecessors, (257), 24 states have call successors, (24), 6 states have call predecessors, (24), 6 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:36,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:36,907 INFO L93 Difference]: Finished difference Result 231 states and 263 transitions. [2021-11-23 03:29:36,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:36,910 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 03:29:36,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:36,921 INFO L225 Difference]: With dead ends: 231 [2021-11-23 03:29:36,921 INFO L226 Difference]: Without dead ends: 230 [2021-11-23 03:29:36,923 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 [2021-11-23 03:29:36,926 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 19 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:36,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 355 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:29:36,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-11-23 03:29:36,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 228. [2021-11-23 03:29:36,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 103 states have (on average 2.174757281553398) internal successors, (224), 216 states have internal predecessors, (224), 24 states have call successors, (24), 6 states have call predecessors, (24), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:29:36,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 258 transitions. [2021-11-23 03:29:36,985 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 258 transitions. Word has length 7 [2021-11-23 03:29:36,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:36,986 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 258 transitions. [2021-11-23 03:29:36,986 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:36,986 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 258 transitions. [2021-11-23 03:29:36,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 03:29:36,987 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:36,987 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:36,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:29:36,987 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ##fun~$Pointer$~TO~VOIDErr1REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:36,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:36,988 INFO L85 PathProgramCache]: Analyzing trace with hash 691826205, now seen corresponding path program 1 times [2021-11-23 03:29:36,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:36,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721708481] [2021-11-23 03:29:36,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:36,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:37,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:37,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:37,066 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:37,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721708481] [2021-11-23 03:29:37,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1721708481] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:37,068 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:37,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:29:37,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626317658] [2021-11-23 03:29:37,069 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:37,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:37,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:37,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:37,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:37,076 INFO L87 Difference]: Start difference. First operand 228 states and 258 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:37,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:37,290 INFO L93 Difference]: Finished difference Result 228 states and 260 transitions. [2021-11-23 03:29:37,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:37,291 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 03:29:37,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:37,296 INFO L225 Difference]: With dead ends: 228 [2021-11-23 03:29:37,301 INFO L226 Difference]: Without dead ends: 228 [2021-11-23 03:29:37,305 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 [2021-11-23 03:29:37,307 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 17 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 360 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:37,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 360 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:29:37,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-11-23 03:29:37,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 226. [2021-11-23 03:29:37,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 103 states have (on average 2.1553398058252426) internal successors, (222), 214 states have internal predecessors, (222), 24 states have call successors, (24), 6 states have call predecessors, (24), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:29:37,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 256 transitions. [2021-11-23 03:29:37,342 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 256 transitions. Word has length 7 [2021-11-23 03:29:37,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:37,344 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 256 transitions. [2021-11-23 03:29:37,344 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:37,345 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 256 transitions. [2021-11-23 03:29:37,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 03:29:37,345 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:37,346 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:37,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:29:37,346 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting dll_insert_masterErr0REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:37,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:37,347 INFO L85 PathProgramCache]: Analyzing trace with hash -892161265, now seen corresponding path program 1 times [2021-11-23 03:29:37,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:37,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45677885] [2021-11-23 03:29:37,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:37,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:37,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:37,398 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:37,398 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:37,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45677885] [2021-11-23 03:29:37,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [45677885] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:37,399 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:37,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:29:37,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785875072] [2021-11-23 03:29:37,400 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:37,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:37,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:37,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:37,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:37,401 INFO L87 Difference]: Start difference. First operand 226 states and 256 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:37,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:37,573 INFO L93 Difference]: Finished difference Result 223 states and 253 transitions. [2021-11-23 03:29:37,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:37,574 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 03:29:37,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:37,576 INFO L225 Difference]: With dead ends: 223 [2021-11-23 03:29:37,577 INFO L226 Difference]: Without dead ends: 223 [2021-11-23 03:29:37,577 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 [2021-11-23 03:29:37,584 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 17 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:37,585 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 346 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:29:37,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-23 03:29:37,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2021-11-23 03:29:37,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 103 states have (on average 2.1262135922330097) internal successors, (219), 211 states have internal predecessors, (219), 24 states have call successors, (24), 6 states have call predecessors, (24), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:29:37,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 253 transitions. [2021-11-23 03:29:37,606 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 253 transitions. Word has length 9 [2021-11-23 03:29:37,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:37,611 INFO L470 AbstractCegarLoop]: Abstraction has 223 states and 253 transitions. [2021-11-23 03:29:37,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:37,612 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 253 transitions. [2021-11-23 03:29:37,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 03:29:37,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:37,613 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:37,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:29:37,613 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_insert_masterErr1REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:37,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:37,614 INFO L85 PathProgramCache]: Analyzing trace with hash -892161264, now seen corresponding path program 1 times [2021-11-23 03:29:37,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:37,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498683048] [2021-11-23 03:29:37,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:37,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:37,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:37,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:37,717 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:37,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498683048] [2021-11-23 03:29:37,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498683048] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:37,718 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:37,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:29:37,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527792649] [2021-11-23 03:29:37,718 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:37,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:37,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:37,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:37,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:37,720 INFO L87 Difference]: Start difference. First operand 223 states and 253 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:37,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:37,878 INFO L93 Difference]: Finished difference Result 220 states and 250 transitions. [2021-11-23 03:29:37,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:37,878 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 03:29:37,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:37,880 INFO L225 Difference]: With dead ends: 220 [2021-11-23 03:29:37,880 INFO L226 Difference]: Without dead ends: 220 [2021-11-23 03:29:37,880 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 [2021-11-23 03:29:37,881 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 14 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 351 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:37,882 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 351 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:37,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-23 03:29:37,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 220. [2021-11-23 03:29:37,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 103 states have (on average 2.0970873786407767) internal successors, (216), 208 states have internal predecessors, (216), 24 states have call successors, (24), 6 states have call predecessors, (24), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:29:37,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 250 transitions. [2021-11-23 03:29:37,892 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 250 transitions. Word has length 9 [2021-11-23 03:29:37,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:37,892 INFO L470 AbstractCegarLoop]: Abstraction has 220 states and 250 transitions. [2021-11-23 03:29:37,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:37,893 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 250 transitions. [2021-11-23 03:29:37,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 03:29:37,893 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:37,893 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:37,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:29:37,894 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ##fun~$Pointer$~TO~VOIDErr5REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:37,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:37,894 INFO L85 PathProgramCache]: Analyzing trace with hash -874929520, now seen corresponding path program 1 times [2021-11-23 03:29:37,894 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:37,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691713109] [2021-11-23 03:29:37,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:37,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:37,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:37,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:37,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:37,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691713109] [2021-11-23 03:29:37,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1691713109] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:37,994 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:37,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:29:37,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940181798] [2021-11-23 03:29:37,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:37,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:29:37,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:37,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:29:37,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:29:37,996 INFO L87 Difference]: Start difference. First operand 220 states and 250 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:38,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:38,199 INFO L93 Difference]: Finished difference Result 242 states and 280 transitions. [2021-11-23 03:29:38,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:29:38,200 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 03:29:38,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:38,202 INFO L225 Difference]: With dead ends: 242 [2021-11-23 03:29:38,202 INFO L226 Difference]: Without dead ends: 242 [2021-11-23 03:29:38,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:38,204 INFO L933 BasicCegarLoop]: 226 mSDtfsCounter, 15 mSDsluCounter, 761 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 880 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:38,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 880 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 181 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:29:38,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-11-23 03:29:38,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 236. [2021-11-23 03:29:38,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 112 states have (on average 2.044642857142857) internal successors, (229), 217 states have internal predecessors, (229), 29 states have call successors, (29), 8 states have call predecessors, (29), 7 states have return successors, (18), 13 states have call predecessors, (18), 15 states have call successors, (18) [2021-11-23 03:29:38,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 276 transitions. [2021-11-23 03:29:38,220 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 276 transitions. Word has length 9 [2021-11-23 03:29:38,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:38,220 INFO L470 AbstractCegarLoop]: Abstraction has 236 states and 276 transitions. [2021-11-23 03:29:38,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:38,220 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 276 transitions. [2021-11-23 03:29:38,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 03:29:38,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:38,221 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:38,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:29:38,221 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_insert_masterErr6REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:38,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:38,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1118615216, now seen corresponding path program 1 times [2021-11-23 03:29:38,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:38,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165261366] [2021-11-23 03:29:38,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:38,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:38,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:38,386 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:38,386 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:38,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165261366] [2021-11-23 03:29:38,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165261366] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:38,387 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:38,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 03:29:38,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892491899] [2021-11-23 03:29:38,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:38,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:29:38,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:38,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:29:38,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:29:38,391 INFO L87 Difference]: Start difference. First operand 236 states and 276 transitions. Second operand has 8 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:38,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:38,827 INFO L93 Difference]: Finished difference Result 255 states and 298 transitions. [2021-11-23 03:29:38,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:29:38,828 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-23 03:29:38,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:38,830 INFO L225 Difference]: With dead ends: 255 [2021-11-23 03:29:38,830 INFO L226 Difference]: Without dead ends: 255 [2021-11-23 03:29:38,830 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:29:38,831 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 92 mSDsluCounter, 720 mSDsCounter, 0 mSdLazyCounter, 617 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 866 SdHoareTripleChecker+Invalid, 631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:38,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 866 Invalid, 631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 617 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:29:38,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-23 03:29:38,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 245. [2021-11-23 03:29:38,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 120 states have (on average 1.9916666666666667) internal successors, (239), 224 states have internal predecessors, (239), 30 states have call successors, (30), 10 states have call predecessors, (30), 7 states have return successors, (19), 13 states have call predecessors, (19), 16 states have call successors, (19) [2021-11-23 03:29:38,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 288 transitions. [2021-11-23 03:29:38,842 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 288 transitions. Word has length 12 [2021-11-23 03:29:38,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:38,843 INFO L470 AbstractCegarLoop]: Abstraction has 245 states and 288 transitions. [2021-11-23 03:29:38,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:38,843 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 288 transitions. [2021-11-23 03:29:38,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 03:29:38,844 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:38,844 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:38,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:29:38,844 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_insert_masterErr7REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:38,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:38,845 INFO L85 PathProgramCache]: Analyzing trace with hash -1118615215, now seen corresponding path program 1 times [2021-11-23 03:29:38,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:38,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851950796] [2021-11-23 03:29:38,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:38,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:38,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:38,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:38,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:38,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851950796] [2021-11-23 03:29:38,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851950796] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:38,987 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:38,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:29:38,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039371917] [2021-11-23 03:29:38,987 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:38,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:29:38,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:38,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:29:38,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:29:38,990 INFO L87 Difference]: Start difference. First operand 245 states and 288 transitions. Second operand has 7 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:39,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:39,531 INFO L93 Difference]: Finished difference Result 253 states and 296 transitions. [2021-11-23 03:29:39,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:29:39,532 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-23 03:29:39,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:39,534 INFO L225 Difference]: With dead ends: 253 [2021-11-23 03:29:39,534 INFO L226 Difference]: Without dead ends: 253 [2021-11-23 03:29:39,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:29:39,535 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 60 mSDsluCounter, 590 mSDsCounter, 0 mSdLazyCounter, 761 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 732 SdHoareTripleChecker+Invalid, 770 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 761 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:39,536 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 732 Invalid, 770 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 761 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:29:39,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-11-23 03:29:39,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 245. [2021-11-23 03:29:39,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 120 states have (on average 1.975) internal successors, (237), 224 states have internal predecessors, (237), 30 states have call successors, (30), 10 states have call predecessors, (30), 7 states have return successors, (19), 13 states have call predecessors, (19), 16 states have call successors, (19) [2021-11-23 03:29:39,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 286 transitions. [2021-11-23 03:29:39,546 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 286 transitions. Word has length 12 [2021-11-23 03:29:39,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:39,546 INFO L470 AbstractCegarLoop]: Abstraction has 245 states and 286 transitions. [2021-11-23 03:29:39,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:39,547 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 286 transitions. [2021-11-23 03:29:39,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:29:39,547 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:39,548 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:39,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:29:39,548 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting dll_insert_masterErr8REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:39,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:39,552 INFO L85 PathProgramCache]: Analyzing trace with hash -317313492, now seen corresponding path program 1 times [2021-11-23 03:29:39,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:39,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418047072] [2021-11-23 03:29:39,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:39,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:39,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:39,609 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:39,613 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:39,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418047072] [2021-11-23 03:29:39,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418047072] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:39,613 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:39,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:29:39,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271513747] [2021-11-23 03:29:39,614 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:39,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:29:39,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:39,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:29:39,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:29:39,615 INFO L87 Difference]: Start difference. First operand 245 states and 286 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:39,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:39,808 INFO L93 Difference]: Finished difference Result 244 states and 285 transitions. [2021-11-23 03:29:39,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:29:39,809 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-23 03:29:39,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:39,812 INFO L225 Difference]: With dead ends: 244 [2021-11-23 03:29:39,812 INFO L226 Difference]: Without dead ends: 244 [2021-11-23 03:29:39,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:29:39,813 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 23 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 478 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:39,813 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 478 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:29:39,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-23 03:29:39,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 244. [2021-11-23 03:29:39,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 120 states have (on average 1.9666666666666666) internal successors, (236), 223 states have internal predecessors, (236), 30 states have call successors, (30), 10 states have call predecessors, (30), 7 states have return successors, (19), 13 states have call predecessors, (19), 16 states have call successors, (19) [2021-11-23 03:29:39,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 285 transitions. [2021-11-23 03:29:39,827 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 285 transitions. Word has length 13 [2021-11-23 03:29:39,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:39,829 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 285 transitions. [2021-11-23 03:29:39,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:39,829 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 285 transitions. [2021-11-23 03:29:39,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:29:39,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:39,830 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:39,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 03:29:39,831 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_insert_masterErr9REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:39,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:39,831 INFO L85 PathProgramCache]: Analyzing trace with hash -317313491, now seen corresponding path program 1 times [2021-11-23 03:29:39,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:39,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070368500] [2021-11-23 03:29:39,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:39,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:39,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:39,895 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:39,895 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:39,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070368500] [2021-11-23 03:29:39,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070368500] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:39,895 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:39,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:29:39,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440406669] [2021-11-23 03:29:39,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:39,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:29:39,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:39,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:29:39,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:29:39,898 INFO L87 Difference]: Start difference. First operand 244 states and 285 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:40,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:40,093 INFO L93 Difference]: Finished difference Result 243 states and 284 transitions. [2021-11-23 03:29:40,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:29:40,094 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-23 03:29:40,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:40,095 INFO L225 Difference]: With dead ends: 243 [2021-11-23 03:29:40,096 INFO L226 Difference]: Without dead ends: 243 [2021-11-23 03:29:40,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:29:40,097 INFO L933 BasicCegarLoop]: 207 mSDtfsCounter, 18 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 492 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:40,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 492 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:29:40,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-23 03:29:40,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2021-11-23 03:29:40,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 120 states have (on average 1.9583333333333333) internal successors, (235), 222 states have internal predecessors, (235), 30 states have call successors, (30), 10 states have call predecessors, (30), 7 states have return successors, (19), 13 states have call predecessors, (19), 16 states have call successors, (19) [2021-11-23 03:29:40,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 284 transitions. [2021-11-23 03:29:40,111 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 284 transitions. Word has length 13 [2021-11-23 03:29:40,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:40,111 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 284 transitions. [2021-11-23 03:29:40,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:40,111 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 284 transitions. [2021-11-23 03:29:40,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 03:29:40,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:40,112 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:40,112 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 03:29:40,113 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_insert_masterErr10REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:40,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:40,113 INFO L85 PathProgramCache]: Analyzing trace with hash 4412237, now seen corresponding path program 1 times [2021-11-23 03:29:40,113 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:40,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052357926] [2021-11-23 03:29:40,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:40,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:40,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:40,343 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:40,344 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:40,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052357926] [2021-11-23 03:29:40,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052357926] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:40,344 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:40,344 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-23 03:29:40,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398844229] [2021-11-23 03:29:40,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:40,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:29:40,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:40,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:29:40,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:29:40,345 INFO L87 Difference]: Start difference. First operand 243 states and 284 transitions. Second operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:40,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:40,930 INFO L93 Difference]: Finished difference Result 270 states and 316 transitions. [2021-11-23 03:29:40,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:29:40,931 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-23 03:29:40,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:40,933 INFO L225 Difference]: With dead ends: 270 [2021-11-23 03:29:40,933 INFO L226 Difference]: Without dead ends: 270 [2021-11-23 03:29:40,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:29:40,934 INFO L933 BasicCegarLoop]: 207 mSDtfsCounter, 23 mSDsluCounter, 1220 mSDsCounter, 0 mSdLazyCounter, 673 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 1330 SdHoareTripleChecker+Invalid, 693 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 673 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:40,934 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 1330 Invalid, 693 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 673 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:29:40,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2021-11-23 03:29:40,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 257. [2021-11-23 03:29:40,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 131 states have (on average 1.916030534351145) internal successors, (251), 233 states have internal predecessors, (251), 32 states have call successors, (32), 12 states have call predecessors, (32), 8 states have return successors, (23), 14 states have call predecessors, (23), 18 states have call successors, (23) [2021-11-23 03:29:40,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 306 transitions. [2021-11-23 03:29:40,946 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 306 transitions. Word has length 15 [2021-11-23 03:29:40,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:40,946 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 306 transitions. [2021-11-23 03:29:40,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:40,947 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 306 transitions. [2021-11-23 03:29:40,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 03:29:40,947 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:40,948 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:40,948 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 03:29:40,948 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ##fun~$Pointer$~TO~VOIDErr5REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:40,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:40,949 INFO L85 PathProgramCache]: Analyzing trace with hash 2063600924, now seen corresponding path program 1 times [2021-11-23 03:29:40,949 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:40,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344562263] [2021-11-23 03:29:40,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:40,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:40,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:41,079 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:29:41,079 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:41,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344562263] [2021-11-23 03:29:41,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344562263] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:41,079 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:41,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:29:41,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352130999] [2021-11-23 03:29:41,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:41,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:29:41,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:41,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:29:41,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:41,081 INFO L87 Difference]: Start difference. First operand 257 states and 306 transitions. Second operand has 6 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:41,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:41,510 INFO L93 Difference]: Finished difference Result 255 states and 304 transitions. [2021-11-23 03:29:41,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:29:41,511 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-23 03:29:41,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:41,513 INFO L225 Difference]: With dead ends: 255 [2021-11-23 03:29:41,513 INFO L226 Difference]: Without dead ends: 255 [2021-11-23 03:29:41,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:29:41,515 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 49 mSDsluCounter, 479 mSDsCounter, 0 mSdLazyCounter, 565 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 637 SdHoareTripleChecker+Invalid, 573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 565 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:41,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 637 Invalid, 573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 565 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:29:41,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-23 03:29:41,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 255. [2021-11-23 03:29:41,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 131 states have (on average 1.900763358778626) internal successors, (249), 231 states have internal predecessors, (249), 32 states have call successors, (32), 12 states have call predecessors, (32), 8 states have return successors, (23), 14 states have call predecessors, (23), 18 states have call successors, (23) [2021-11-23 03:29:41,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 304 transitions. [2021-11-23 03:29:41,526 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 304 transitions. Word has length 23 [2021-11-23 03:29:41,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:41,526 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 304 transitions. [2021-11-23 03:29:41,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:41,527 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 304 transitions. [2021-11-23 03:29:41,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 03:29:41,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:41,528 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:41,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 03:29:41,528 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ##fun~$Pointer$~TO~VOIDErr4REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:41,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:41,528 INFO L85 PathProgramCache]: Analyzing trace with hash 2063600923, now seen corresponding path program 1 times [2021-11-23 03:29:41,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:41,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607563999] [2021-11-23 03:29:41,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:41,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:41,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:41,613 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:29:41,613 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:41,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607563999] [2021-11-23 03:29:41,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607563999] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:41,614 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:41,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:29:41,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67997022] [2021-11-23 03:29:41,614 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:41,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:29:41,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:41,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:29:41,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:29:41,616 INFO L87 Difference]: Start difference. First operand 255 states and 304 transitions. Second operand has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:41,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:41,944 INFO L93 Difference]: Finished difference Result 253 states and 302 transitions. [2021-11-23 03:29:41,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:29:41,945 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-23 03:29:41,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:41,947 INFO L225 Difference]: With dead ends: 253 [2021-11-23 03:29:41,947 INFO L226 Difference]: Without dead ends: 253 [2021-11-23 03:29:41,947 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:29:41,948 INFO L933 BasicCegarLoop]: 204 mSDtfsCounter, 45 mSDsluCounter, 725 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 874 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:41,948 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 874 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:29:41,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-11-23 03:29:41,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 253. [2021-11-23 03:29:41,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 131 states have (on average 1.8854961832061068) internal successors, (247), 229 states have internal predecessors, (247), 32 states have call successors, (32), 12 states have call predecessors, (32), 8 states have return successors, (23), 14 states have call predecessors, (23), 18 states have call successors, (23) [2021-11-23 03:29:41,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 302 transitions. [2021-11-23 03:29:41,960 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 302 transitions. Word has length 23 [2021-11-23 03:29:41,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:41,966 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 302 transitions. [2021-11-23 03:29:41,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:41,966 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 302 transitions. [2021-11-23 03:29:41,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 03:29:41,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:41,967 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:41,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 03:29:41,968 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ##fun~$Pointer$~TO~VOIDErr6REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:41,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:41,968 INFO L85 PathProgramCache]: Analyzing trace with hash -452863182, now seen corresponding path program 1 times [2021-11-23 03:29:41,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:41,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883942403] [2021-11-23 03:29:41,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:41,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:41,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:42,024 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:29:42,025 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:42,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883942403] [2021-11-23 03:29:42,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883942403] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:42,025 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:42,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:29:42,026 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253581059] [2021-11-23 03:29:42,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:42,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:29:42,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:42,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:29:42,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:29:42,027 INFO L87 Difference]: Start difference. First operand 253 states and 302 transitions. Second operand has 4 states, 3 states have (on average 5.333333333333333) internal successors, (16), 4 states have internal predecessors, (16), 1 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:42,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:42,213 INFO L93 Difference]: Finished difference Result 252 states and 301 transitions. [2021-11-23 03:29:42,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:29:42,214 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 5.333333333333333) internal successors, (16), 4 states have internal predecessors, (16), 1 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-23 03:29:42,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:42,215 INFO L225 Difference]: With dead ends: 252 [2021-11-23 03:29:42,216 INFO L226 Difference]: Without dead ends: 252 [2021-11-23 03:29:42,216 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:29:42,217 INFO L933 BasicCegarLoop]: 204 mSDtfsCounter, 20 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 476 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:42,217 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 476 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:29:42,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-23 03:29:42,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 252. [2021-11-23 03:29:42,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 131 states have (on average 1.8778625954198473) internal successors, (246), 228 states have internal predecessors, (246), 32 states have call successors, (32), 12 states have call predecessors, (32), 8 states have return successors, (23), 14 states have call predecessors, (23), 18 states have call successors, (23) [2021-11-23 03:29:42,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 301 transitions. [2021-11-23 03:29:42,227 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 301 transitions. Word has length 24 [2021-11-23 03:29:42,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:42,227 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 301 transitions. [2021-11-23 03:29:42,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 5.333333333333333) internal successors, (16), 4 states have internal predecessors, (16), 1 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:42,228 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 301 transitions. [2021-11-23 03:29:42,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 03:29:42,229 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:42,229 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:42,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 03:29:42,229 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ##fun~$Pointer$~TO~VOIDErr7REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:42,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:42,230 INFO L85 PathProgramCache]: Analyzing trace with hash -452863181, now seen corresponding path program 1 times [2021-11-23 03:29:42,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:42,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118303150] [2021-11-23 03:29:42,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:42,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:42,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:42,286 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:29:42,286 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:42,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118303150] [2021-11-23 03:29:42,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118303150] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:42,287 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:42,287 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:29:42,287 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007497322] [2021-11-23 03:29:42,287 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:42,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:29:42,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:42,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:29:42,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:29:42,289 INFO L87 Difference]: Start difference. First operand 252 states and 301 transitions. Second operand has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:42,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:42,442 INFO L93 Difference]: Finished difference Result 251 states and 300 transitions. [2021-11-23 03:29:42,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:29:42,443 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-23 03:29:42,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:42,445 INFO L225 Difference]: With dead ends: 251 [2021-11-23 03:29:42,445 INFO L226 Difference]: Without dead ends: 251 [2021-11-23 03:29:42,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:42,446 INFO L933 BasicCegarLoop]: 204 mSDtfsCounter, 29 mSDsluCounter, 384 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 546 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:42,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 546 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:42,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-11-23 03:29:42,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2021-11-23 03:29:42,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 131 states have (on average 1.8702290076335877) internal successors, (245), 227 states have internal predecessors, (245), 32 states have call successors, (32), 12 states have call predecessors, (32), 8 states have return successors, (23), 14 states have call predecessors, (23), 18 states have call successors, (23) [2021-11-23 03:29:42,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 300 transitions. [2021-11-23 03:29:42,456 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 300 transitions. Word has length 24 [2021-11-23 03:29:42,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:42,456 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 300 transitions. [2021-11-23 03:29:42,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:42,457 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 300 transitions. [2021-11-23 03:29:42,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 03:29:42,457 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:42,458 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:42,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 03:29:42,458 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ##fun~$Pointer$~TO~VOIDErr8REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:42,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:42,459 INFO L85 PathProgramCache]: Analyzing trace with hash -1409818669, now seen corresponding path program 1 times [2021-11-23 03:29:42,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:42,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610941853] [2021-11-23 03:29:42,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:42,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:42,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:42,603 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:29:42,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:42,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610941853] [2021-11-23 03:29:42,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610941853] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:42,603 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:42,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-23 03:29:42,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907222246] [2021-11-23 03:29:42,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:42,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:29:42,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:42,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:29:42,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:29:42,605 INFO L87 Difference]: Start difference. First operand 251 states and 300 transitions. Second operand has 9 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:43,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:43,031 INFO L93 Difference]: Finished difference Result 260 states and 310 transitions. [2021-11-23 03:29:43,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:29:43,032 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 03:29:43,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:43,034 INFO L225 Difference]: With dead ends: 260 [2021-11-23 03:29:43,035 INFO L226 Difference]: Without dead ends: 260 [2021-11-23 03:29:43,035 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:29:43,036 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 14 mSDsluCounter, 878 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 1006 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:43,036 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 1006 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 461 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:29:43,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-23 03:29:43,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 259. [2021-11-23 03:29:43,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 138 states have (on average 1.826086956521739) internal successors, (252), 235 states have internal predecessors, (252), 32 states have call successors, (32), 12 states have call predecessors, (32), 9 states have return successors, (25), 14 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-23 03:29:43,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 309 transitions. [2021-11-23 03:29:43,049 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 309 transitions. Word has length 26 [2021-11-23 03:29:43,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:43,050 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 309 transitions. [2021-11-23 03:29:43,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:43,050 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 309 transitions. [2021-11-23 03:29:43,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 03:29:43,057 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:43,057 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-23 03:29:43,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 03:29:43,057 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ##fun~$Pointer$~TO~VOIDErr8REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:43,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:43,058 INFO L85 PathProgramCache]: Analyzing trace with hash -143384194, now seen corresponding path program 1 times [2021-11-23 03:29:43,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:43,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194339893] [2021-11-23 03:29:43,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:43,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:43,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:43,352 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:43,353 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:43,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194339893] [2021-11-23 03:29:43,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194339893] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:29:43,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314495570] [2021-11-23 03:29:43,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:43,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:29:43,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:29:43,357 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:29:43,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:29:43,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:43,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-23 03:29:43,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:43,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-23 03:29:43,839 INFO L354 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2021-11-23 03:29:43,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 26 treesize of output 41 [2021-11-23 03:29:43,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2021-11-23 03:29:43,995 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:29:43,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 45 treesize of output 36 [2021-11-23 03:29:44,112 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 03:29:44,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 30 [2021-11-23 03:29:44,246 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:29:44,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:48,727 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-23 03:29:48,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 64 treesize of output 1 [2021-11-23 03:29:48,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 96 treesize of output 92 [2021-11-23 03:29:50,137 INFO L354 Elim1Store]: treesize reduction 18, result has 85.1 percent of original size [2021-11-23 03:29:50,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 72 treesize of output 162 [2021-11-23 03:29:50,659 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:50,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1314495570] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:50,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2050707013] [2021-11-23 03:29:50,679 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 03:29:50,679 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:29:50,685 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:29:50,687 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:29:50,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 12] total 31 [2021-11-23 03:29:50,688 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240115066] [2021-11-23 03:29:50,688 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:29:50,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 03:29:50,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:50,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 03:29:50,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=883, Unknown=2, NotChecked=0, Total=992 [2021-11-23 03:29:50,690 INFO L87 Difference]: Start difference. First operand 259 states and 309 transitions. Second operand has 32 states, 27 states have (on average 1.962962962962963) internal successors, (53), 28 states have internal predecessors, (53), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:29:55,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:55,638 INFO L93 Difference]: Finished difference Result 261 states and 310 transitions. [2021-11-23 03:29:55,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:29:55,639 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 27 states have (on average 1.962962962962963) internal successors, (53), 28 states have internal predecessors, (53), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2021-11-23 03:29:55,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:55,641 INFO L225 Difference]: With dead ends: 261 [2021-11-23 03:29:55,641 INFO L226 Difference]: Without dead ends: 261 [2021-11-23 03:29:55,642 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=305, Invalid=1414, Unknown=3, NotChecked=0, Total=1722 [2021-11-23 03:29:55,643 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 76 mSDsluCounter, 3099 mSDsCounter, 0 mSdLazyCounter, 1220 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 3045 SdHoareTripleChecker+Invalid, 1942 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 691 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:55,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 3045 Invalid, 1942 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1220 Invalid, 0 Unknown, 691 Unchecked, 0.8s Time] [2021-11-23 03:29:55,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-11-23 03:29:55,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 258. [2021-11-23 03:29:55,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 138 states have (on average 1.818840579710145) internal successors, (251), 234 states have internal predecessors, (251), 32 states have call successors, (32), 12 states have call predecessors, (32), 9 states have return successors, (23), 14 states have call predecessors, (23), 18 states have call successors, (23) [2021-11-23 03:29:55,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 306 transitions. [2021-11-23 03:29:55,653 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 306 transitions. Word has length 37 [2021-11-23 03:29:55,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:55,654 INFO L470 AbstractCegarLoop]: Abstraction has 258 states and 306 transitions. [2021-11-23 03:29:55,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 27 states have (on average 1.962962962962963) internal successors, (53), 28 states have internal predecessors, (53), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:29:55,654 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 306 transitions. [2021-11-23 03:29:55,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 03:29:55,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:55,655 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-23 03:29:55,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:55,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:29:55,870 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ##fun~$Pointer$~TO~VOIDErr9REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:29:55,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:55,870 INFO L85 PathProgramCache]: Analyzing trace with hash -143384193, now seen corresponding path program 1 times [2021-11-23 03:29:55,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:55,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587311840] [2021-11-23 03:29:55,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:55,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:55,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:56,249 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:56,249 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:56,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587311840] [2021-11-23 03:29:56,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587311840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:29:56,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045652200] [2021-11-23 03:29:56,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:56,250 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:29:56,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:29:56,251 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:29:56,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:29:56,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:56,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-23 03:29:56,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:56,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:29:56,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-23 03:29:56,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:29:56,776 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-23 03:29:56,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2021-11-23 03:29:56,792 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-23 03:29:56,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2021-11-23 03:29:56,861 INFO L354 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2021-11-23 03:29:56,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 03:29:56,900 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 03:29:56,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-23 03:29:57,005 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-23 03:29:57,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 69 treesize of output 64 [2021-11-23 03:29:57,023 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-23 03:29:57,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 58 treesize of output 53 [2021-11-23 03:29:57,203 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 03:29:57,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 57 [2021-11-23 03:29:57,210 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:29:57,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 39 [2021-11-23 03:29:57,494 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:29:57,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:50,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 347 treesize of output 339 [2021-11-23 03:30:50,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1187 treesize of output 1139 [2021-11-23 03:31:00,594 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:31:00,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 85 [2021-11-23 03:31:01,663 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:31:01,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045652200] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:31:01,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [885967736] [2021-11-23 03:31:01,667 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 03:31:01,667 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:31:01,667 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:31:01,669 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:31:01,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 12] total 33 [2021-11-23 03:31:01,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903308844] [2021-11-23 03:31:01,670 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:31:01,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 03:31:01,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:31:01,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 03:31:01,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=998, Unknown=17, NotChecked=0, Total=1122 [2021-11-23 03:31:01,672 INFO L87 Difference]: Start difference. First operand 258 states and 306 transitions. Second operand has 34 states, 29 states have (on average 2.0) internal successors, (58), 30 states have internal predecessors, (58), 5 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:31:03,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:31:03,553 INFO L93 Difference]: Finished difference Result 274 states and 331 transitions. [2021-11-23 03:31:03,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:31:03,554 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 29 states have (on average 2.0) internal successors, (58), 30 states have internal predecessors, (58), 5 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2021-11-23 03:31:03,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:31:03,556 INFO L225 Difference]: With dead ends: 274 [2021-11-23 03:31:03,556 INFO L226 Difference]: Without dead ends: 274 [2021-11-23 03:31:03,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 54.1s TimeCoverageRelationStatistics Valid=304, Invalid=1935, Unknown=17, NotChecked=0, Total=2256 [2021-11-23 03:31:03,558 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 50 mSDsluCounter, 2295 mSDsCounter, 0 mSdLazyCounter, 1004 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 2281 SdHoareTripleChecker+Invalid, 1979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 1004 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 948 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:31:03,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 2281 Invalid, 1979 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 1004 Invalid, 0 Unknown, 948 Unchecked, 0.9s Time] [2021-11-23 03:31:03,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-11-23 03:31:03,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 272. [2021-11-23 03:31:03,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 150 states have (on average 1.7733333333333334) internal successors, (266), 246 states have internal predecessors, (266), 33 states have call successors, (33), 13 states have call predecessors, (33), 10 states have return successors, (28), 15 states have call predecessors, (28), 19 states have call successors, (28) [2021-11-23 03:31:03,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 327 transitions. [2021-11-23 03:31:03,569 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 327 transitions. Word has length 37 [2021-11-23 03:31:03,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:31:03,570 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 327 transitions. [2021-11-23 03:31:03,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 29 states have (on average 2.0) internal successors, (58), 30 states have internal predecessors, (58), 5 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:31:03,570 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 327 transitions. [2021-11-23 03:31:03,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 03:31:03,571 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:31:03,572 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:31:03,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:31:03,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:31:03,791 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting dll_insert_masterErr10REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:31:03,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:31:03,791 INFO L85 PathProgramCache]: Analyzing trace with hash -835158194, now seen corresponding path program 1 times [2021-11-23 03:31:03,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:31:03,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416523082] [2021-11-23 03:31:03,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:03,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:31:03,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:03,876 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:31:03,876 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:31:03,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416523082] [2021-11-23 03:31:03,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416523082] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:31:03,877 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:31:03,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:31:03,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541837994] [2021-11-23 03:31:03,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:31:03,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:31:03,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:31:03,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:31:03,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:31:03,878 INFO L87 Difference]: Start difference. First operand 272 states and 327 transitions. Second operand has 5 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 3 states have call successors, (8), 4 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:31:04,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:31:04,065 INFO L93 Difference]: Finished difference Result 261 states and 302 transitions. [2021-11-23 03:31:04,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:31:04,065 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 3 states have call successors, (8), 4 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-11-23 03:31:04,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:31:04,067 INFO L225 Difference]: With dead ends: 261 [2021-11-23 03:31:04,067 INFO L226 Difference]: Without dead ends: 261 [2021-11-23 03:31:04,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:31:04,068 INFO L933 BasicCegarLoop]: 207 mSDtfsCounter, 20 mSDsluCounter, 704 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 812 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:31:04,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 812 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:31:04,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-11-23 03:31:04,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 261. [2021-11-23 03:31:04,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 142 states have (on average 1.7746478873239437) internal successors, (252), 238 states have internal predecessors, (252), 30 states have call successors, (30), 12 states have call predecessors, (30), 10 states have return successors, (20), 13 states have call predecessors, (20), 16 states have call successors, (20) [2021-11-23 03:31:04,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 302 transitions. [2021-11-23 03:31:04,086 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 302 transitions. Word has length 40 [2021-11-23 03:31:04,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:31:04,087 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 302 transitions. [2021-11-23 03:31:04,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 3 states have call successors, (8), 4 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:31:04,087 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 302 transitions. [2021-11-23 03:31:04,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 03:31:04,088 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:31:04,088 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:31:04,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 03:31:04,088 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting dll_insert_masterErr12REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:31:04,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:31:04,089 INFO L85 PathProgramCache]: Analyzing trace with hash 54211896, now seen corresponding path program 1 times [2021-11-23 03:31:04,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:31:04,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528998824] [2021-11-23 03:31:04,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:04,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:31:04,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:04,559 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:31:04,559 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:31:04,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528998824] [2021-11-23 03:31:04,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528998824] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:31:04,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655866777] [2021-11-23 03:31:04,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:04,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:04,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:31:04,567 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:31:04,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:31:04,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:04,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 03:31:04,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:31:04,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 03:31:25,685 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:31:25,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:31:26,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655866777] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:31:26,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2024133825] [2021-11-23 03:31:26,376 INFO L159 IcfgInterpreter]: Started Sifa with 33 locations of interest [2021-11-23 03:31:26,376 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:31:26,377 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:31:26,378 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:31:26,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 25 [2021-11-23 03:31:26,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659419644] [2021-11-23 03:31:26,378 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:31:26,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 03:31:26,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:31:26,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 03:31:26,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=571, Unknown=9, NotChecked=0, Total=650 [2021-11-23 03:31:26,380 INFO L87 Difference]: Start difference. First operand 261 states and 302 transitions. Second operand has 25 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-23 03:31:32,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:31:32,943 INFO L93 Difference]: Finished difference Result 274 states and 319 transitions. [2021-11-23 03:31:32,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 03:31:32,944 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) Word has length 46 [2021-11-23 03:31:32,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:31:32,946 INFO L225 Difference]: With dead ends: 274 [2021-11-23 03:31:32,946 INFO L226 Difference]: Without dead ends: 274 [2021-11-23 03:31:32,947 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 26.4s TimeCoverageRelationStatistics Valid=145, Invalid=1105, Unknown=10, NotChecked=0, Total=1260 [2021-11-23 03:31:32,947 INFO L933 BasicCegarLoop]: 183 mSDtfsCounter, 59 mSDsluCounter, 2287 mSDsCounter, 0 mSdLazyCounter, 1516 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 2188 SdHoareTripleChecker+Invalid, 1917 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 1516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 365 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:31:32,948 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 2188 Invalid, 1917 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 1516 Invalid, 0 Unknown, 365 Unchecked, 1.2s Time] [2021-11-23 03:31:32,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-11-23 03:31:32,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 261. [2021-11-23 03:31:32,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 142 states have (on average 1.7746478873239437) internal successors, (252), 238 states have internal predecessors, (252), 30 states have call successors, (30), 12 states have call predecessors, (30), 10 states have return successors, (19), 13 states have call predecessors, (19), 16 states have call successors, (19) [2021-11-23 03:31:32,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 301 transitions. [2021-11-23 03:31:32,959 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 301 transitions. Word has length 46 [2021-11-23 03:31:32,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:31:32,960 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 301 transitions. [2021-11-23 03:31:32,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-23 03:31:32,961 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 301 transitions. [2021-11-23 03:31:32,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:31:32,962 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:31:32,962 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-23 03:31:33,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:31:33,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:33,175 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting dll_insert_masterErr12REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:31:33,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:31:33,175 INFO L85 PathProgramCache]: Analyzing trace with hash -750347739, now seen corresponding path program 1 times [2021-11-23 03:31:33,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:31:33,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271953251] [2021-11-23 03:31:33,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:33,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:31:33,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:34,708 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:31:34,709 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:31:34,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271953251] [2021-11-23 03:31:34,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271953251] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:31:34,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621375564] [2021-11-23 03:31:34,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:34,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:34,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:31:34,710 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:31:34,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:31:34,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:34,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 03:31:34,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:31:34,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:31:34,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:31:35,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-23 03:31:35,852 INFO L354 Elim1Store]: treesize reduction 93, result has 20.5 percent of original size [2021-11-23 03:31:35,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 40 treesize of output 49 [2021-11-23 03:31:35,975 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:31:35,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:31:36,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621375564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:31:36,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [677159617] [2021-11-23 03:31:36,277 INFO L159 IcfgInterpreter]: Started Sifa with 34 locations of interest [2021-11-23 03:31:36,277 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:31:36,278 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:31:36,279 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:31:36,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 13] total 33 [2021-11-23 03:31:36,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930753767] [2021-11-23 03:31:36,280 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:31:36,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 03:31:36,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:31:36,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 03:31:36,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1076, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 03:31:36,282 INFO L87 Difference]: Start difference. First operand 261 states and 301 transitions. Second operand has 34 states, 29 states have (on average 2.310344827586207) internal successors, (67), 30 states have internal predecessors, (67), 8 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-23 03:31:40,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:31:40,521 INFO L93 Difference]: Finished difference Result 285 states and 330 transitions. [2021-11-23 03:31:40,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 03:31:40,521 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 29 states have (on average 2.310344827586207) internal successors, (67), 30 states have internal predecessors, (67), 8 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) Word has length 47 [2021-11-23 03:31:40,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:31:40,523 INFO L225 Difference]: With dead ends: 285 [2021-11-23 03:31:40,524 INFO L226 Difference]: Without dead ends: 285 [2021-11-23 03:31:40,525 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=255, Invalid=2501, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 03:31:40,525 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 103 mSDsluCounter, 1621 mSDsCounter, 0 mSdLazyCounter, 2591 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 1634 SdHoareTripleChecker+Invalid, 3281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2591 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 655 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:31:40,526 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 1634 Invalid, 3281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 2591 Invalid, 0 Unknown, 655 Unchecked, 2.6s Time] [2021-11-23 03:31:40,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-23 03:31:40,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 284. [2021-11-23 03:31:40,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 160 states have (on average 1.71875) internal successors, (275), 256 states have internal predecessors, (275), 31 states have call successors, (31), 13 states have call predecessors, (31), 14 states have return successors, (24), 17 states have call predecessors, (24), 17 states have call successors, (24) [2021-11-23 03:31:40,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 330 transitions. [2021-11-23 03:31:40,537 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 330 transitions. Word has length 47 [2021-11-23 03:31:40,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:31:40,537 INFO L470 AbstractCegarLoop]: Abstraction has 284 states and 330 transitions. [2021-11-23 03:31:40,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 29 states have (on average 2.310344827586207) internal successors, (67), 30 states have internal predecessors, (67), 8 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-23 03:31:40,537 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 330 transitions. [2021-11-23 03:31:40,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:31:40,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:31:40,538 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-23 03:31:40,570 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:31:40,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-11-23 03:31:40,755 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting dll_insert_masterErr13REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:31:40,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:31:40,755 INFO L85 PathProgramCache]: Analyzing trace with hash -750347738, now seen corresponding path program 1 times [2021-11-23 03:31:40,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:31:40,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434765613] [2021-11-23 03:31:40,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:40,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:31:40,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:41,741 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:31:41,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:31:41,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434765613] [2021-11-23 03:31:41,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434765613] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:31:41,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978968353] [2021-11-23 03:31:41,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:41,742 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:41,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:31:41,743 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:31:41,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:31:41,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:41,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-23 03:31:41,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:31:41,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:31:42,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 25 [2021-11-23 03:31:42,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:32:10,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 90 treesize of output 74 [2021-11-23 03:32:10,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 63 [2021-11-23 03:32:11,429 INFO L354 Elim1Store]: treesize reduction 93, result has 14.7 percent of original size [2021-11-23 03:32:11,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 59 [2021-11-23 03:32:11,438 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-23 03:32:11,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 59 treesize of output 51 [2021-11-23 03:32:11,548 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:32:11,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:32:12,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978968353] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:12,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2129271750] [2021-11-23 03:32:12,818 INFO L159 IcfgInterpreter]: Started Sifa with 34 locations of interest [2021-11-23 03:32:12,819 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:32:12,819 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:32:12,819 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:32:12,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 21] total 34 [2021-11-23 03:32:12,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159415418] [2021-11-23 03:32:12,820 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:32:12,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 03:32:12,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:12,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 03:32:12,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1158, Unknown=8, NotChecked=0, Total=1332 [2021-11-23 03:32:12,821 INFO L87 Difference]: Start difference. First operand 284 states and 330 transitions. Second operand has 35 states, 30 states have (on average 2.2666666666666666) internal successors, (68), 30 states have internal predecessors, (68), 8 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-23 03:32:53,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:53,111 INFO L93 Difference]: Finished difference Result 284 states and 328 transitions. [2021-11-23 03:32:53,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 03:32:53,111 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 30 states have (on average 2.2666666666666666) internal successors, (68), 30 states have internal predecessors, (68), 8 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 47 [2021-11-23 03:32:53,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:53,113 INFO L225 Difference]: With dead ends: 284 [2021-11-23 03:32:53,113 INFO L226 Difference]: Without dead ends: 284 [2021-11-23 03:32:53,114 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 67.5s TimeCoverageRelationStatistics Valid=251, Invalid=1888, Unknown=23, NotChecked=0, Total=2162 [2021-11-23 03:32:53,115 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 230 mSDsluCounter, 911 mSDsCounter, 0 mSdLazyCounter, 1887 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 991 SdHoareTripleChecker+Invalid, 2584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 1887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 612 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:53,116 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [230 Valid, 991 Invalid, 2584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 1887 Invalid, 0 Unknown, 612 Unchecked, 1.9s Time] [2021-11-23 03:32:53,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2021-11-23 03:32:53,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 284. [2021-11-23 03:32:53,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 160 states have (on average 1.70625) internal successors, (273), 256 states have internal predecessors, (273), 31 states have call successors, (31), 13 states have call predecessors, (31), 14 states have return successors, (24), 17 states have call predecessors, (24), 17 states have call successors, (24) [2021-11-23 03:32:53,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 328 transitions. [2021-11-23 03:32:53,126 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 328 transitions. Word has length 47 [2021-11-23 03:32:53,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:53,126 INFO L470 AbstractCegarLoop]: Abstraction has 284 states and 328 transitions. [2021-11-23 03:32:53,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 30 states have (on average 2.2666666666666666) internal successors, (68), 30 states have internal predecessors, (68), 8 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-23 03:32:53,127 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 328 transitions. [2021-11-23 03:32:53,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 03:32:53,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:53,127 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-23 03:32:53,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:32:53,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-23 03:32:53,343 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting dll_insert_masterErr14REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:32:53,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:53,343 INFO L85 PathProgramCache]: Analyzing trace with hash -1785924258, now seen corresponding path program 1 times [2021-11-23 03:32:53,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:53,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002169000] [2021-11-23 03:32:53,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:53,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:53,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:54,085 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:32:54,086 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:54,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002169000] [2021-11-23 03:32:54,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2002169000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:54,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463628549] [2021-11-23 03:32:54,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:54,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:54,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:54,096 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:32:54,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:32:54,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:54,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 03:32:54,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:32:54,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-11-23 03:32:54,922 INFO L354 Elim1Store]: treesize reduction 93, result has 20.5 percent of original size [2021-11-23 03:32:54,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 31 treesize of output 40 [2021-11-23 03:32:55,121 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:32:55,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:32:55,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463628549] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:55,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1014130534] [2021-11-23 03:32:55,430 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-23 03:32:55,431 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:32:55,431 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:32:55,432 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:32:55,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17] total 24 [2021-11-23 03:32:55,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807621341] [2021-11-23 03:32:55,433 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:32:55,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 03:32:55,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:55,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 03:32:55,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=575, Unknown=0, NotChecked=0, Total=650 [2021-11-23 03:32:55,435 INFO L87 Difference]: Start difference. First operand 284 states and 328 transitions. Second operand has 25 states, 19 states have (on average 2.789473684210526) internal successors, (53), 21 states have internal predecessors, (53), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-23 03:32:57,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:57,659 INFO L93 Difference]: Finished difference Result 306 states and 353 transitions. [2021-11-23 03:32:57,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 03:32:57,662 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 19 states have (on average 2.789473684210526) internal successors, (53), 21 states have internal predecessors, (53), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) Word has length 48 [2021-11-23 03:32:57,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:57,664 INFO L225 Difference]: With dead ends: 306 [2021-11-23 03:32:57,665 INFO L226 Difference]: Without dead ends: 303 [2021-11-23 03:32:57,666 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=193, Invalid=1447, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 03:32:57,667 INFO L933 BasicCegarLoop]: 181 mSDtfsCounter, 163 mSDsluCounter, 1601 mSDsCounter, 0 mSdLazyCounter, 1342 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 1601 SdHoareTripleChecker+Invalid, 2057 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 674 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:57,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 1601 Invalid, 2057 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 1342 Invalid, 0 Unknown, 674 Unchecked, 1.5s Time] [2021-11-23 03:32:57,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-11-23 03:32:57,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 300. [2021-11-23 03:32:57,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 173 states have (on average 1.6589595375722543) internal successors, (287), 269 states have internal predecessors, (287), 32 states have call successors, (32), 14 states have call predecessors, (32), 16 states have return successors, (26), 19 states have call predecessors, (26), 18 states have call successors, (26) [2021-11-23 03:32:57,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 345 transitions. [2021-11-23 03:32:57,679 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 345 transitions. Word has length 48 [2021-11-23 03:32:57,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:57,680 INFO L470 AbstractCegarLoop]: Abstraction has 300 states and 345 transitions. [2021-11-23 03:32:57,680 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 19 states have (on average 2.789473684210526) internal successors, (53), 21 states have internal predecessors, (53), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-23 03:32:57,680 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 345 transitions. [2021-11-23 03:32:57,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 03:32:57,681 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:57,681 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-23 03:32:57,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:32:57,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:57,896 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting dll_insert_masterErr15REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:32:57,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:57,897 INFO L85 PathProgramCache]: Analyzing trace with hash -1785924257, now seen corresponding path program 1 times [2021-11-23 03:32:57,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:57,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116532339] [2021-11-23 03:32:57,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:57,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:57,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:59,061 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:32:59,061 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:59,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116532339] [2021-11-23 03:32:59,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116532339] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:59,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015186321] [2021-11-23 03:32:59,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:59,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:59,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:59,062 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:32:59,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:32:59,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:59,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 03:32:59,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:32:59,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2021-11-23 03:32:59,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:33:00,179 INFO L354 Elim1Store]: treesize reduction 86, result has 21.1 percent of original size [2021-11-23 03:33:00,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 53 [2021-11-23 03:33:00,189 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-23 03:33:00,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 50 [2021-11-23 03:33:00,318 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:33:00,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:00,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015186321] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:33:00,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1194090834] [2021-11-23 03:33:00,759 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-23 03:33:00,759 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:33:00,759 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:33:00,760 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:33:00,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 14] total 30 [2021-11-23 03:33:00,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146501973] [2021-11-23 03:33:00,761 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:33:00,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 03:33:00,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:33:00,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 03:33:00,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=947, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:33:00,762 INFO L87 Difference]: Start difference. First operand 300 states and 345 transitions. Second operand has 31 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 24 states have internal predecessors, (61), 13 states have call successors, (13), 7 states have call predecessors, (13), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:33:03,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:33:03,805 INFO L93 Difference]: Finished difference Result 300 states and 344 transitions. [2021-11-23 03:33:03,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 03:33:03,806 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 24 states have internal predecessors, (61), 13 states have call successors, (13), 7 states have call predecessors, (13), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) Word has length 48 [2021-11-23 03:33:03,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:33:03,809 INFO L225 Difference]: With dead ends: 300 [2021-11-23 03:33:03,809 INFO L226 Difference]: Without dead ends: 300 [2021-11-23 03:33:03,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=242, Invalid=2014, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 03:33:03,811 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 174 mSDsluCounter, 1715 mSDsCounter, 0 mSdLazyCounter, 2034 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 1687 SdHoareTripleChecker+Invalid, 2629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 2034 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 532 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:33:03,811 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 1687 Invalid, 2629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 2034 Invalid, 0 Unknown, 532 Unchecked, 2.0s Time] [2021-11-23 03:33:03,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-11-23 03:33:03,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 300. [2021-11-23 03:33:03,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 173 states have (on average 1.653179190751445) internal successors, (286), 269 states have internal predecessors, (286), 32 states have call successors, (32), 14 states have call predecessors, (32), 16 states have return successors, (26), 19 states have call predecessors, (26), 18 states have call successors, (26) [2021-11-23 03:33:03,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 344 transitions. [2021-11-23 03:33:03,822 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 344 transitions. Word has length 48 [2021-11-23 03:33:03,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:33:03,822 INFO L470 AbstractCegarLoop]: Abstraction has 300 states and 344 transitions. [2021-11-23 03:33:03,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 24 states have internal predecessors, (61), 13 states have call successors, (13), 7 states have call predecessors, (13), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:33:03,823 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 344 transitions. [2021-11-23 03:33:03,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 03:33:03,824 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:33:03,824 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 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] [2021-11-23 03:33:03,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-23 03:33:04,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:04,039 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ##fun~$Pointer$~TO~VOIDErr9REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:33:04,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:33:04,039 INFO L85 PathProgramCache]: Analyzing trace with hash 1639410556, now seen corresponding path program 1 times [2021-11-23 03:33:04,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:33:04,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058958974] [2021-11-23 03:33:04,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:04,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:33:04,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:04,514 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:33:04,514 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:33:04,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058958974] [2021-11-23 03:33:04,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058958974] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:33:04,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605598653] [2021-11-23 03:33:04,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:04,515 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:04,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:33:04,516 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:33:04,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:33:04,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:04,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 460 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-23 03:33:04,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:33:04,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:33:04,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-23 03:33:04,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:33:05,097 INFO L354 Elim1Store]: treesize reduction 20, result has 39.4 percent of original size [2021-11-23 03:33:05,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 20 treesize of output 22 [2021-11-23 03:33:05,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-23 03:33:05,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-23 03:33:05,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2021-11-23 03:33:05,289 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:33:05,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 70 treesize of output 65 [2021-11-23 03:33:05,308 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:33:05,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 59 treesize of output 50 [2021-11-23 03:33:05,423 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 03:33:05,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 50 [2021-11-23 03:33:05,432 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 03:33:05,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 28 [2021-11-23 03:33:05,505 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:33:05,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:19,878 WARN L227 SmtUtils]: Spent 7.90s on a formula simplification that was a NOOP. DAG size: 28 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:33:28,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 55 [2021-11-23 03:33:28,699 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-23 03:33:28,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 1 [2021-11-23 03:33:28,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 251 treesize of output 247 [2021-11-23 03:33:28,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1020 treesize of output 980 [2021-11-23 03:33:33,321 INFO L354 Elim1Store]: treesize reduction 18, result has 28.0 percent of original size [2021-11-23 03:33:33,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 54 [2021-11-23 03:33:33,750 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:33:33,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605598653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:33:33,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1165907894] [2021-11-23 03:33:33,752 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-23 03:33:33,753 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:33:33,753 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:33:33,754 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:33:33,754 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15, 13] total 32 [2021-11-23 03:33:33,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945753688] [2021-11-23 03:33:33,755 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:33:33,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 03:33:33,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:33:33,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 03:33:33,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=936, Unknown=7, NotChecked=0, Total=1056 [2021-11-23 03:33:33,757 INFO L87 Difference]: Start difference. First operand 300 states and 344 transitions. Second operand has 33 states, 31 states have (on average 2.225806451612903) internal successors, (69), 32 states have internal predecessors, (69), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:33:45,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:33:45,255 INFO L93 Difference]: Finished difference Result 300 states and 343 transitions. [2021-11-23 03:33:45,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:33:45,256 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 2.225806451612903) internal successors, (69), 32 states have internal predecessors, (69), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) Word has length 51 [2021-11-23 03:33:45,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:33:45,258 INFO L225 Difference]: With dead ends: 300 [2021-11-23 03:33:45,258 INFO L226 Difference]: Without dead ends: 300 [2021-11-23 03:33:45,259 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 34.3s TimeCoverageRelationStatistics Valid=379, Invalid=1683, Unknown=8, NotChecked=0, Total=2070 [2021-11-23 03:33:45,259 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 79 mSDsluCounter, 2345 mSDsCounter, 0 mSdLazyCounter, 886 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 2341 SdHoareTripleChecker+Invalid, 1838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 886 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 922 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:33:45,260 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 2341 Invalid, 1838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 886 Invalid, 0 Unknown, 922 Unchecked, 0.9s Time] [2021-11-23 03:33:45,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-11-23 03:33:45,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 300. [2021-11-23 03:33:45,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 173 states have (on average 1.6473988439306357) internal successors, (285), 269 states have internal predecessors, (285), 32 states have call successors, (32), 14 states have call predecessors, (32), 16 states have return successors, (26), 19 states have call predecessors, (26), 18 states have call successors, (26) [2021-11-23 03:33:45,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 343 transitions. [2021-11-23 03:33:45,271 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 343 transitions. Word has length 51 [2021-11-23 03:33:45,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:33:45,271 INFO L470 AbstractCegarLoop]: Abstraction has 300 states and 343 transitions. [2021-11-23 03:33:45,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 2.225806451612903) internal successors, (69), 32 states have internal predecessors, (69), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:33:45,272 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 343 transitions. [2021-11-23 03:33:45,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:33:45,273 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:33:45,273 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 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] [2021-11-23 03:33:45,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:33:45,486 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 03:33:45,487 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting dll_insert_masterErr6REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:33:45,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:33:45,487 INFO L85 PathProgramCache]: Analyzing trace with hash -410953665, now seen corresponding path program 1 times [2021-11-23 03:33:45,487 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:33:45,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533279760] [2021-11-23 03:33:45,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:45,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:33:45,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:45,656 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:33:45,656 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:33:45,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533279760] [2021-11-23 03:33:45,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [533279760] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:33:45,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036249218] [2021-11-23 03:33:45,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:45,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:45,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:33:45,658 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:33:45,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:33:45,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:45,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 03:33:45,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:33:45,907 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:33:45,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-11-23 03:33:45,960 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:33:45,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:46,237 INFO L354 Elim1Store]: treesize reduction 18, result has 28.0 percent of original size [2021-11-23 03:33:46,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 26 [2021-11-23 03:33:46,296 INFO L354 Elim1Store]: treesize reduction 18, result has 28.0 percent of original size [2021-11-23 03:33:46,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 26 [2021-11-23 03:33:46,394 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:33:46,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036249218] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:33:46,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1233578067] [2021-11-23 03:33:46,397 INFO L159 IcfgInterpreter]: Started Sifa with 36 locations of interest [2021-11-23 03:33:46,398 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:33:46,398 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:33:46,401 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:33:46,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 14 [2021-11-23 03:33:46,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190681132] [2021-11-23 03:33:46,401 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:33:46,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 03:33:46,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:33:46,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 03:33:46,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2021-11-23 03:33:46,403 INFO L87 Difference]: Start difference. First operand 300 states and 343 transitions. Second operand has 15 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 13 states have internal predecessors, (47), 7 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (8), 6 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 03:33:46,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:33:46,844 INFO L93 Difference]: Finished difference Result 308 states and 354 transitions. [2021-11-23 03:33:46,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 03:33:46,845 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 13 states have internal predecessors, (47), 7 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (8), 6 states have call predecessors, (8), 3 states have call successors, (8) Word has length 60 [2021-11-23 03:33:46,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:33:46,847 INFO L225 Difference]: With dead ends: 308 [2021-11-23 03:33:46,847 INFO L226 Difference]: Without dead ends: 308 [2021-11-23 03:33:46,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:33:46,848 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 50 mSDsluCounter, 1294 mSDsCounter, 0 mSdLazyCounter, 361 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 1369 SdHoareTripleChecker+Invalid, 829 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 361 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 461 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:33:46,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 1369 Invalid, 829 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 361 Invalid, 0 Unknown, 461 Unchecked, 0.4s Time] [2021-11-23 03:33:46,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-11-23 03:33:46,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 308. [2021-11-23 03:33:46,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 180 states have (on average 1.6277777777777778) internal successors, (293), 275 states have internal predecessors, (293), 33 states have call successors, (33), 16 states have call predecessors, (33), 16 states have return successors, (28), 19 states have call predecessors, (28), 19 states have call successors, (28) [2021-11-23 03:33:46,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 354 transitions. [2021-11-23 03:33:46,861 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 354 transitions. Word has length 60 [2021-11-23 03:33:46,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:33:46,861 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 354 transitions. [2021-11-23 03:33:46,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 13 states have internal predecessors, (47), 7 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (8), 6 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 03:33:46,862 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 354 transitions. [2021-11-23 03:33:46,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:33:46,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:33:46,863 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 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] [2021-11-23 03:33:46,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:33:47,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 03:33:47,063 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting dll_insert_masterErr7REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:33:47,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:33:47,064 INFO L85 PathProgramCache]: Analyzing trace with hash -410953664, now seen corresponding path program 1 times [2021-11-23 03:33:47,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:33:47,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138424671] [2021-11-23 03:33:47,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:47,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:33:47,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:47,377 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 9 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:33:47,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:33:47,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138424671] [2021-11-23 03:33:47,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1138424671] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:33:47,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501314678] [2021-11-23 03:33:47,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:47,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:47,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:33:47,379 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:33:47,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:33:47,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:47,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 03:33:47,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:33:47,846 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 03:33:47,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 24 [2021-11-23 03:33:47,854 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-23 03:33:47,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-11-23 03:33:47,946 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 9 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:33:47,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:48,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 38 [2021-11-23 03:33:48,452 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:33:48,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 37 [2021-11-23 03:33:48,626 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:33:48,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 30 [2021-11-23 03:33:48,638 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:33:48,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-23 03:33:48,723 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 03:33:48,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 37 [2021-11-23 03:33:48,734 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:33:48,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-23 03:33:48,889 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 9 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:33:48,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501314678] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:33:48,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1709824861] [2021-11-23 03:33:48,892 INFO L159 IcfgInterpreter]: Started Sifa with 36 locations of interest [2021-11-23 03:33:48,892 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:33:48,892 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:33:48,893 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:33:48,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 24 [2021-11-23 03:33:48,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224907425] [2021-11-23 03:33:48,893 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:33:48,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 03:33:48,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:33:48,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 03:33:48,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:33:48,895 INFO L87 Difference]: Start difference. First operand 308 states and 354 transitions. Second operand has 25 states, 18 states have (on average 3.5) internal successors, (63), 19 states have internal predecessors, (63), 10 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-23 03:33:49,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:33:49,777 INFO L93 Difference]: Finished difference Result 310 states and 354 transitions. [2021-11-23 03:33:49,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:33:49,778 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 18 states have (on average 3.5) internal successors, (63), 19 states have internal predecessors, (63), 10 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) Word has length 60 [2021-11-23 03:33:49,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:33:49,780 INFO L225 Difference]: With dead ends: 310 [2021-11-23 03:33:49,780 INFO L226 Difference]: Without dead ends: 310 [2021-11-23 03:33:49,781 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=137, Invalid=855, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:33:49,781 INFO L933 BasicCegarLoop]: 198 mSDtfsCounter, 79 mSDsluCounter, 2113 mSDsCounter, 0 mSdLazyCounter, 692 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 2079 SdHoareTripleChecker+Invalid, 1452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 743 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:33:49,782 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 2079 Invalid, 1452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 692 Invalid, 0 Unknown, 743 Unchecked, 0.6s Time] [2021-11-23 03:33:49,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-11-23 03:33:49,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 310. [2021-11-23 03:33:49,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 181 states have (on average 1.6187845303867403) internal successors, (293), 276 states have internal predecessors, (293), 33 states have call successors, (33), 16 states have call predecessors, (33), 17 states have return successors, (28), 20 states have call predecessors, (28), 19 states have call successors, (28) [2021-11-23 03:33:49,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 354 transitions. [2021-11-23 03:33:49,793 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 354 transitions. Word has length 60 [2021-11-23 03:33:49,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:33:49,793 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 354 transitions. [2021-11-23 03:33:49,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 18 states have (on average 3.5) internal successors, (63), 19 states have internal predecessors, (63), 10 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-23 03:33:49,794 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 354 transitions. [2021-11-23 03:33:49,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:33:49,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:33:49,795 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:33:49,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:33:50,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:50,003 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting dll_insert_masterErr12REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:33:50,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:33:50,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1578028647, now seen corresponding path program 1 times [2021-11-23 03:33:50,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:33:50,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [446270587] [2021-11-23 03:33:50,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:50,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:33:50,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:50,556 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 26 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:33:50,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:33:50,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [446270587] [2021-11-23 03:33:50,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [446270587] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:33:50,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87102537] [2021-11-23 03:33:50,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:50,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:50,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:33:50,558 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:33:50,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:33:50,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:50,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-23 03:33:50,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:33:50,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 03:34:10,446 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 28 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:34:10,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:34:11,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87102537] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:34:11,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [58395976] [2021-11-23 03:34:11,134 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-23 03:34:11,135 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:34:11,135 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:34:11,136 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:34:11,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18] total 26 [2021-11-23 03:34:11,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379841597] [2021-11-23 03:34:11,137 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:34:11,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 03:34:11,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:34:11,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 03:34:11,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=622, Unknown=8, NotChecked=0, Total=702 [2021-11-23 03:34:11,139 INFO L87 Difference]: Start difference. First operand 310 states and 354 transitions. Second operand has 26 states, 25 states have (on average 2.32) internal successors, (58), 25 states have internal predecessors, (58), 4 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:34:19,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:34:19,684 INFO L93 Difference]: Finished difference Result 299 states and 337 transitions. [2021-11-23 03:34:19,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:34:19,685 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.32) internal successors, (58), 25 states have internal predecessors, (58), 4 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 60 [2021-11-23 03:34:19,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:34:19,687 INFO L225 Difference]: With dead ends: 299 [2021-11-23 03:34:19,687 INFO L226 Difference]: Without dead ends: 293 [2021-11-23 03:34:19,688 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=149, Invalid=1174, Unknown=9, NotChecked=0, Total=1332 [2021-11-23 03:34:19,689 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 66 mSDsluCounter, 2793 mSDsCounter, 0 mSdLazyCounter, 2111 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 2625 SdHoareTripleChecker+Invalid, 2525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 379 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:34:19,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 2625 Invalid, 2525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 2111 Invalid, 0 Unknown, 379 Unchecked, 1.6s Time] [2021-11-23 03:34:19,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-11-23 03:34:19,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 293. [2021-11-23 03:34:19,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 167 states have (on average 1.6467065868263473) internal successors, (275), 261 states have internal predecessors, (275), 32 states have call successors, (32), 15 states have call predecessors, (32), 15 states have return successors, (24), 19 states have call predecessors, (24), 18 states have call successors, (24) [2021-11-23 03:34:19,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 331 transitions. [2021-11-23 03:34:19,699 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 331 transitions. Word has length 60 [2021-11-23 03:34:19,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:34:19,700 INFO L470 AbstractCegarLoop]: Abstraction has 293 states and 331 transitions. [2021-11-23 03:34:19,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.32) internal successors, (58), 25 states have internal predecessors, (58), 4 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:34:19,700 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 331 transitions. [2021-11-23 03:34:19,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:34:19,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:34:19,702 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:34:19,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:34:19,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 03:34:19,915 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting dll_insert_masterErr12REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:34:19,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:34:19,915 INFO L85 PathProgramCache]: Analyzing trace with hash -1299602016, now seen corresponding path program 2 times [2021-11-23 03:34:19,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:34:19,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119197241] [2021-11-23 03:34:19,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:34:19,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:34:19,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:34:22,324 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:34:22,324 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:34:22,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119197241] [2021-11-23 03:34:22,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119197241] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:34:22,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961246185] [2021-11-23 03:34:22,325 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:34:22,325 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:34:22,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:34:22,327 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:34:22,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:34:23,164 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:34:23,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:34:23,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 03:34:23,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:34:23,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:34:23,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:34:23,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-23 03:34:24,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-23 03:34:24,483 INFO L354 Elim1Store]: treesize reduction 160, result has 17.1 percent of original size [2021-11-23 03:34:24,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 58 [2021-11-23 03:34:24,612 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:34:24,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:34:24,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1961246185] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:34:24,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2105457872] [2021-11-23 03:34:24,981 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-23 03:34:24,981 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:34:24,982 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:34:24,982 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:34:24,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 14] total 42 [2021-11-23 03:34:24,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732986174] [2021-11-23 03:34:24,983 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:34:24,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 03:34:24,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:34:24,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 03:34:24,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1745, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 03:34:24,986 INFO L87 Difference]: Start difference. First operand 293 states and 331 transitions. Second operand has 43 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 39 states have internal predecessors, (80), 10 states have call successors, (12), 3 states have call predecessors, (12), 7 states have return successors, (10), 10 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-23 03:34:31,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:34:31,168 INFO L93 Difference]: Finished difference Result 314 states and 357 transitions. [2021-11-23 03:34:31,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 03:34:31,169 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 39 states have internal predecessors, (80), 10 states have call successors, (12), 3 states have call predecessors, (12), 7 states have return successors, (10), 10 states have call predecessors, (10), 9 states have call successors, (10) Word has length 61 [2021-11-23 03:34:31,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:34:31,171 INFO L225 Difference]: With dead ends: 314 [2021-11-23 03:34:31,172 INFO L226 Difference]: Without dead ends: 314 [2021-11-23 03:34:31,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 917 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=310, Invalid=3596, Unknown=0, NotChecked=0, Total=3906 [2021-11-23 03:34:31,174 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 158 mSDsluCounter, 2293 mSDsCounter, 0 mSdLazyCounter, 3157 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 2243 SdHoareTripleChecker+Invalid, 3791 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 3157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 578 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:34:31,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 2243 Invalid, 3791 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 3157 Invalid, 0 Unknown, 578 Unchecked, 3.7s Time] [2021-11-23 03:34:31,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2021-11-23 03:34:31,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 301. [2021-11-23 03:34:31,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 173 states have (on average 1.6416184971098267) internal successors, (284), 265 states have internal predecessors, (284), 32 states have call successors, (32), 15 states have call predecessors, (32), 17 states have return successors, (28), 23 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-23 03:34:31,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 344 transitions. [2021-11-23 03:34:31,186 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 344 transitions. Word has length 61 [2021-11-23 03:34:31,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:34:31,187 INFO L470 AbstractCegarLoop]: Abstraction has 301 states and 344 transitions. [2021-11-23 03:34:31,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 39 states have internal predecessors, (80), 10 states have call successors, (12), 3 states have call predecessors, (12), 7 states have return successors, (10), 10 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-23 03:34:31,187 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 344 transitions. [2021-11-23 03:34:31,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:34:31,188 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:34:31,188 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:34:31,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:34:31,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 03:34:31,413 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting dll_insert_masterErr13REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:34:31,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:34:31,413 INFO L85 PathProgramCache]: Analyzing trace with hash -1299602015, now seen corresponding path program 1 times [2021-11-23 03:34:31,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:34:31,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644449402] [2021-11-23 03:34:31,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:34:31,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:34:31,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:34:32,678 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:34:32,678 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:34:32,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644449402] [2021-11-23 03:34:32,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644449402] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:34:32,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885987282] [2021-11-23 03:34:32,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:34:32,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:34:32,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:34:32,679 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:34:32,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:34:32,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:34:32,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 158 conjunts are in the unsatisfiable core [2021-11-23 03:34:32,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:34:32,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:34:33,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2021-11-23 03:34:33,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:34:33,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-23 03:34:33,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 15 [2021-11-23 03:34:33,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-23 03:34:34,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 45 [2021-11-23 03:34:34,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:34:34,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:34:34,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 64 [2021-11-23 03:34:34,652 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 03:34:34,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 47 [2021-11-23 03:34:34,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 18 [2021-11-23 03:34:34,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-23 03:35:56,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 115 treesize of output 95 [2021-11-23 03:35:56,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 84 [2021-11-23 03:35:57,309 INFO L354 Elim1Store]: treesize reduction 164, result has 11.4 percent of original size [2021-11-23 03:35:57,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 80 treesize of output 88 [2021-11-23 03:35:57,316 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-23 03:35:57,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 91 treesize of output 83 [2021-11-23 03:35:57,519 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 14 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:35:57,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:36:00,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885987282] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:36:00,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [159089563] [2021-11-23 03:36:00,360 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2021-11-23 03:36:00,360 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:36:00,360 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:36:00,362 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:36:00,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 30] total 42 [2021-11-23 03:36:00,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864330465] [2021-11-23 03:36:00,363 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:36:00,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 03:36:00,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:00,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 03:36:00,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1750, Unknown=38, NotChecked=0, Total=1980 [2021-11-23 03:36:00,365 INFO L87 Difference]: Start difference. First operand 301 states and 344 transitions. Second operand has 43 states, 38 states have (on average 2.1842105263157894) internal successors, (83), 37 states have internal predecessors, (83), 10 states have call successors, (12), 4 states have call predecessors, (12), 8 states have return successors, (10), 10 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-23 03:36:37,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:37,126 INFO L93 Difference]: Finished difference Result 320 states and 366 transitions. [2021-11-23 03:36:37,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 03:36:37,126 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 38 states have (on average 2.1842105263157894) internal successors, (83), 37 states have internal predecessors, (83), 10 states have call successors, (12), 4 states have call predecessors, (12), 8 states have return successors, (10), 10 states have call predecessors, (10), 9 states have call successors, (10) Word has length 61 [2021-11-23 03:36:37,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:37,131 INFO L225 Difference]: With dead ends: 320 [2021-11-23 03:36:37,131 INFO L226 Difference]: Without dead ends: 320 [2021-11-23 03:36:37,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 957 ImplicationChecksByTransitivity, 116.4s TimeCoverageRelationStatistics Valid=348, Invalid=3508, Unknown=50, NotChecked=0, Total=3906 [2021-11-23 03:36:37,133 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 189 mSDsluCounter, 1868 mSDsCounter, 0 mSdLazyCounter, 3234 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 1791 SdHoareTripleChecker+Invalid, 4465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 3234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1166 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:37,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 1791 Invalid, 4465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 3234 Invalid, 0 Unknown, 1166 Unchecked, 3.5s Time] [2021-11-23 03:36:37,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-11-23 03:36:37,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 299. [2021-11-23 03:36:37,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 171 states have (on average 1.6374269005847952) internal successors, (280), 265 states have internal predecessors, (280), 32 states have call successors, (32), 15 states have call predecessors, (32), 17 states have return successors, (28), 21 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-23 03:36:37,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 340 transitions. [2021-11-23 03:36:37,144 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 340 transitions. Word has length 61 [2021-11-23 03:36:37,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:37,144 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 340 transitions. [2021-11-23 03:36:37,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 38 states have (on average 2.1842105263157894) internal successors, (83), 37 states have internal predecessors, (83), 10 states have call successors, (12), 4 states have call predecessors, (12), 8 states have return successors, (10), 10 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-23 03:36:37,145 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 340 transitions. [2021-11-23 03:36:37,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 03:36:37,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:37,146 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 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] [2021-11-23 03:36:37,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:36:37,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 03:36:37,371 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting dll_insert_masterErr10REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:36:37,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:37,371 INFO L85 PathProgramCache]: Analyzing trace with hash -2044777986, now seen corresponding path program 1 times [2021-11-23 03:36:37,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:37,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595697493] [2021-11-23 03:36:37,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:37,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:37,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:37,719 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:36:37,719 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:37,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595697493] [2021-11-23 03:36:37,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595697493] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:36:37,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394198210] [2021-11-23 03:36:37,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:37,720 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:36:37,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:36:37,723 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:36:37,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:36:37,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:37,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 519 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-23 03:36:37,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:36:38,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-23 03:36:38,264 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-23 03:36:38,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2021-11-23 03:36:38,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:36:38,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-23 03:36:38,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:36:38,411 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-23 03:36:38,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 32 [2021-11-23 03:36:38,518 INFO L354 Elim1Store]: treesize reduction 110, result has 17.9 percent of original size [2021-11-23 03:36:38,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 49 treesize of output 54 [2021-11-23 03:36:40,604 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 03:36:40,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 52 treesize of output 28 [2021-11-23 03:36:40,632 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:36:40,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:36:42,691 WARN L838 $PredicateComparison]: unable to prove that (forall ((|dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| Int)) (= (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| |c_dll_insert_master_alloc_or_die_master_~ptr~1#1.base| (store (store (store (select |c_#memory_$Pointer$.base| |c_dll_insert_master_alloc_or_die_master_~ptr~1#1.base|) |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 0) (+ |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 4) 0) (+ |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 8) 0)) |c_dll_insert_master_~dll#1.base|) |c_dll_insert_master_~dll#1.offset|)) 1)) is different from false [2021-11-23 03:36:44,705 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| Int) (|dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| Int)) (or (<= |c_#StackHeapBarrier| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37|) (= (select (store |c_#valid| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| 1) (select (select (store |c_#memory_$Pointer$.base| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| (store (store (store (select |c_#memory_$Pointer$.base| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37|) |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 0) (+ |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 4) 0) (+ |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 8) 0)) |c_dll_insert_master_#in~dll#1.base|) |c_dll_insert_master_#in~dll#1.offset|)) 1))) is different from false [2021-11-23 03:36:46,724 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| Int) (|dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| Int)) (or (= (select (store |c_#valid| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| 1) (select (select (store |c_#memory_$Pointer$.base| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| (store (store (store (select |c_#memory_$Pointer$.base| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37|) |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 0) (+ |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 4) 0) (+ |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 8) 0)) |c_##fun~$Pointer$~TO~VOID_#~10#1.base|) |c_##fun~$Pointer$~TO~VOID_#~10#1.offset|)) 1) (<= |c_#StackHeapBarrier| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37|))) is different from false [2021-11-23 03:36:48,750 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| Int) (|dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| Int)) (or (= (select (store |c_#valid| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| 1) (select (select (store |c_#memory_$Pointer$.base| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| (store (store (store (select |c_#memory_$Pointer$.base| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37|) |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 0) (+ |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 4) 0) (+ |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 8) 0)) |c_##fun~$Pointer$~TO~VOID_#in~10#1.base|) |c_##fun~$Pointer$~TO~VOID_#in~10#1.offset|)) 1) (<= |c_#StackHeapBarrier| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37|))) is different from false [2021-11-23 03:36:50,774 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| Int) (|dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| Int)) (or (<= |c_#StackHeapBarrier| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37|) (= (select (store |c_#valid| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| 1) (select (select (store |c_#memory_$Pointer$.base| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37| (store (store (store (select |c_#memory_$Pointer$.base| |v_dll_insert_master_alloc_or_die_master_~ptr~1#1.base_37|) |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 0) (+ |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 4) 0) (+ |dll_insert_master_alloc_or_die_master_~ptr~1#1.offset| 8) 0)) |c_dll_create_generic_~#dll~0.base|) |c_dll_create_generic_~#dll~0.offset|)) 1))) is different from false [2021-11-23 03:36:50,887 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:36:50,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 267 treesize of output 252 [2021-11-23 03:36:53,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 3471 treesize of output 3439 [2021-11-23 03:36:53,242 INFO L354 Elim1Store]: treesize reduction 5, result has 80.0 percent of original size [2021-11-23 03:36:53,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 4207 treesize of output 3968 [2021-11-23 03:36:53,597 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-23 03:36:53,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1007749472] [2021-11-23 03:36:53,599 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2021-11-23 03:36:53,599 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:36:53,599 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:36:53,599 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:36:53,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-23 03:36:53,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364004791] [2021-11-23 03:36:53,600 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:36:53,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:36:53,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:53,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:36:53,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=673, Unknown=6, NotChecked=280, Total=1056 [2021-11-23 03:36:53,601 INFO L87 Difference]: Start difference. First operand 299 states and 340 transitions. Second operand has 14 states, 12 states have (on average 3.25) internal successors, (39), 13 states have internal predecessors, (39), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 03:36:54,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:54,766 INFO L93 Difference]: Finished difference Result 296 states and 337 transitions. [2021-11-23 03:36:54,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 03:36:54,767 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.25) internal successors, (39), 13 states have internal predecessors, (39), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 63 [2021-11-23 03:36:54,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:54,768 INFO L225 Difference]: With dead ends: 296 [2021-11-23 03:36:54,768 INFO L226 Difference]: Without dead ends: 296 [2021-11-23 03:36:54,769 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=149, Invalid=921, Unknown=6, NotChecked=330, Total=1406 [2021-11-23 03:36:54,770 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 57 mSDsluCounter, 1739 mSDsCounter, 0 mSdLazyCounter, 1217 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 1783 SdHoareTripleChecker+Invalid, 1255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:54,770 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 1783 Invalid, 1255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1217 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 03:36:54,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-23 03:36:54,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 296. [2021-11-23 03:36:54,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 171 states have (on average 1.6198830409356726) internal successors, (277), 262 states have internal predecessors, (277), 32 states have call successors, (32), 15 states have call predecessors, (32), 17 states have return successors, (28), 21 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-23 03:36:54,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 337 transitions. [2021-11-23 03:36:54,781 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 337 transitions. Word has length 63 [2021-11-23 03:36:54,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:54,781 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 337 transitions. [2021-11-23 03:36:54,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.25) internal successors, (39), 13 states have internal predecessors, (39), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 03:36:54,781 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 337 transitions. [2021-11-23 03:36:54,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 03:36:54,782 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:54,783 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 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] [2021-11-23 03:36:54,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:36:55,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:36:55,011 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting dll_insert_masterErr11REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:36:55,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:55,011 INFO L85 PathProgramCache]: Analyzing trace with hash -2044777985, now seen corresponding path program 1 times [2021-11-23 03:36:55,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:55,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624525527] [2021-11-23 03:36:55,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:55,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:55,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:55,528 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:36:55,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:55,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624525527] [2021-11-23 03:36:55,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1624525527] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:36:55,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585149965] [2021-11-23 03:36:55,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:55,530 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:36:55,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:36:55,532 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:36:55,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:36:55,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:55,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 519 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-23 03:36:55,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:36:56,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 35 [2021-11-23 03:36:56,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-23 03:36:56,540 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-23 03:36:56,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 43 [2021-11-23 03:36:56,558 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-23 03:36:56,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 39 [2021-11-23 03:36:56,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:36:56,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 48 [2021-11-23 03:36:56,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:36:56,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 48 [2021-11-23 03:36:56,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:36:56,799 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-23 03:36:56,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 73 [2021-11-23 03:36:56,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:36:56,815 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-23 03:36:56,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 67 treesize of output 65 [2021-11-23 03:36:56,987 INFO L354 Elim1Store]: treesize reduction 110, result has 17.9 percent of original size [2021-11-23 03:36:56,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 99 treesize of output 100 [2021-11-23 03:36:57,025 INFO L354 Elim1Store]: treesize reduction 110, result has 17.9 percent of original size [2021-11-23 03:36:57,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 95 treesize of output 100 [2021-11-23 03:36:59,266 INFO L354 Elim1Store]: treesize reduction 118, result has 2.5 percent of original size [2021-11-23 03:36:59,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 108 treesize of output 87 [2021-11-23 03:36:59,296 INFO L354 Elim1Store]: treesize reduction 118, result has 2.5 percent of original size [2021-11-23 03:36:59,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 72 treesize of output 47 [2021-11-23 03:36:59,388 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:36:59,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:37:52,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2217 treesize of output 2209 [2021-11-23 03:37:52,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14662 treesize of output 14530 [2021-11-23 03:37:52,888 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 03:37:52,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 17688 treesize of output 16686 [2021-11-23 03:37:54,154 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:37:54,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14286 treesize of output 14285 [2021-11-23 03:37:54,289 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-23 03:37:54,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [201601029] [2021-11-23 03:37:54,291 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2021-11-23 03:37:54,291 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:37:54,292 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:37:54,293 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:37:54,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-23 03:37:54,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728633933] [2021-11-23 03:37:54,293 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:37:54,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:37:54,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:54,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:37:54,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1404, Unknown=20, NotChecked=0, Total=1560 [2021-11-23 03:37:54,295 INFO L87 Difference]: Start difference. First operand 296 states and 337 transitions. Second operand has 14 states, 12 states have (on average 3.25) internal successors, (39), 13 states have internal predecessors, (39), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 03:37:55,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:55,779 INFO L93 Difference]: Finished difference Result 295 states and 336 transitions. [2021-11-23 03:37:55,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 03:37:55,780 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.25) internal successors, (39), 13 states have internal predecessors, (39), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 63 [2021-11-23 03:37:55,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:55,782 INFO L225 Difference]: With dead ends: 295 [2021-11-23 03:37:55,782 INFO L226 Difference]: Without dead ends: 295 [2021-11-23 03:37:55,783 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 56.5s TimeCoverageRelationStatistics Valid=246, Invalid=1990, Unknown=20, NotChecked=0, Total=2256 [2021-11-23 03:37:55,783 INFO L933 BasicCegarLoop]: 198 mSDtfsCounter, 61 mSDsluCounter, 1550 mSDsCounter, 0 mSdLazyCounter, 1163 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 1586 SdHoareTripleChecker+Invalid, 1195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:55,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 1586 Invalid, 1195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1163 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:37:55,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-11-23 03:37:55,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 295. [2021-11-23 03:37:55,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 171 states have (on average 1.6140350877192982) internal successors, (276), 261 states have internal predecessors, (276), 32 states have call successors, (32), 15 states have call predecessors, (32), 17 states have return successors, (28), 21 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-23 03:37:55,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 336 transitions. [2021-11-23 03:37:55,793 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 336 transitions. Word has length 63 [2021-11-23 03:37:55,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:55,794 INFO L470 AbstractCegarLoop]: Abstraction has 295 states and 336 transitions. [2021-11-23 03:37:55,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.25) internal successors, (39), 13 states have internal predecessors, (39), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 03:37:55,794 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 336 transitions. [2021-11-23 03:37:55,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 03:37:55,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:55,795 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:37:55,829 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-23 03:37:56,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-23 03:37:56,017 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting dll_insert_masterErr14REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:37:56,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:56,018 INFO L85 PathProgramCache]: Analyzing trace with hash -1632937661, now seen corresponding path program 1 times [2021-11-23 03:37:56,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:56,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546895065] [2021-11-23 03:37:56,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:56,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:56,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:57,269 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 03:37:57,269 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:57,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546895065] [2021-11-23 03:37:57,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546895065] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:37:57,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630788849] [2021-11-23 03:37:57,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:57,270 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:57,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:37:57,271 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:37:57,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 03:37:57,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:57,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 03:37:57,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:37:57,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-11-23 03:37:57,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:37:57,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:37:57,984 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:37:57,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 24 [2021-11-23 03:37:58,608 INFO L354 Elim1Store]: treesize reduction 188, result has 10.0 percent of original size [2021-11-23 03:37:58,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 8 case distinctions, treesize of input 72 treesize of output 73 [2021-11-23 03:37:58,813 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 23 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:37:58,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:37:59,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1630788849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:37:59,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [517711462] [2021-11-23 03:37:59,234 INFO L159 IcfgInterpreter]: Started Sifa with 36 locations of interest [2021-11-23 03:37:59,234 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:37:59,234 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:37:59,235 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:37:59,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 19] total 27 [2021-11-23 03:37:59,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717093298] [2021-11-23 03:37:59,236 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:37:59,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 03:37:59,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:59,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 03:37:59,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:37:59,238 INFO L87 Difference]: Start difference. First operand 295 states and 336 transitions. Second operand has 28 states, 22 states have (on average 2.909090909090909) internal successors, (64), 24 states have internal predecessors, (64), 11 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (10), 10 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-23 03:38:00,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:00,624 INFO L93 Difference]: Finished difference Result 298 states and 341 transitions. [2021-11-23 03:38:00,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 03:38:00,626 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 22 states have (on average 2.909090909090909) internal successors, (64), 24 states have internal predecessors, (64), 11 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (10), 10 states have call predecessors, (10), 8 states have call successors, (10) Word has length 62 [2021-11-23 03:38:00,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:00,628 INFO L225 Difference]: With dead ends: 298 [2021-11-23 03:38:00,628 INFO L226 Difference]: Without dead ends: 298 [2021-11-23 03:38:00,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=188, Invalid=1294, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 03:38:00,629 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 146 mSDsluCounter, 1612 mSDsCounter, 0 mSdLazyCounter, 861 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 1638 SdHoareTripleChecker+Invalid, 1618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 861 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 721 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:00,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 1638 Invalid, 1618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 861 Invalid, 0 Unknown, 721 Unchecked, 0.9s Time] [2021-11-23 03:38:00,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-23 03:38:00,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 297. [2021-11-23 03:38:00,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 173 states have (on average 1.6127167630057804) internal successors, (279), 262 states have internal predecessors, (279), 32 states have call successors, (32), 15 states have call predecessors, (32), 17 states have return successors, (28), 22 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-23 03:38:00,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 339 transitions. [2021-11-23 03:38:00,639 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 339 transitions. Word has length 62 [2021-11-23 03:38:00,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:00,639 INFO L470 AbstractCegarLoop]: Abstraction has 297 states and 339 transitions. [2021-11-23 03:38:00,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 22 states have (on average 2.909090909090909) internal successors, (64), 24 states have internal predecessors, (64), 11 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (10), 10 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-23 03:38:00,640 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 339 transitions. [2021-11-23 03:38:00,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 03:38:00,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:00,641 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:38:00,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:38:00,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:00,855 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting dll_insert_masterErr15REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:38:00,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:00,855 INFO L85 PathProgramCache]: Analyzing trace with hash -1632937660, now seen corresponding path program 1 times [2021-11-23 03:38:00,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:00,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599624444] [2021-11-23 03:38:00,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:00,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:00,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:02,220 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 1 proven. 26 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:38:02,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:02,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599624444] [2021-11-23 03:38:02,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599624444] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:02,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531286401] [2021-11-23 03:38:02,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:02,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:02,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:02,221 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:02,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 03:38:02,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:02,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 03:38:02,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:02,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2021-11-23 03:38:02,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:38:03,473 INFO L354 Elim1Store]: treesize reduction 154, result has 16.8 percent of original size [2021-11-23 03:38:03,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 48 treesize of output 66 [2021-11-23 03:38:03,486 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-23 03:38:03,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 63 treesize of output 63 [2021-11-23 03:38:03,592 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 03:38:03,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:38:04,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531286401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:04,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [824280400] [2021-11-23 03:38:04,021 INFO L159 IcfgInterpreter]: Started Sifa with 36 locations of interest [2021-11-23 03:38:04,021 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:38:04,022 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:38:04,023 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:38:04,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 31 [2021-11-23 03:38:04,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653793085] [2021-11-23 03:38:04,023 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:38:04,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 03:38:04,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:04,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 03:38:04,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1007, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:38:04,025 INFO L87 Difference]: Start difference. First operand 297 states and 339 transitions. Second operand has 32 states, 25 states have (on average 2.76) internal successors, (69), 25 states have internal predecessors, (69), 14 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-23 03:38:06,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:06,982 INFO L93 Difference]: Finished difference Result 310 states and 351 transitions. [2021-11-23 03:38:06,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:38:06,983 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 25 states have (on average 2.76) internal successors, (69), 25 states have internal predecessors, (69), 14 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 62 [2021-11-23 03:38:06,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:06,985 INFO L225 Difference]: With dead ends: 310 [2021-11-23 03:38:06,986 INFO L226 Difference]: Without dead ends: 310 [2021-11-23 03:38:06,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=232, Invalid=1930, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 03:38:06,987 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 278 mSDsluCounter, 1645 mSDsCounter, 0 mSdLazyCounter, 1442 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 1628 SdHoareTripleChecker+Invalid, 2018 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 1442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 483 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:06,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [278 Valid, 1628 Invalid, 2018 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 1442 Invalid, 0 Unknown, 483 Unchecked, 1.8s Time] [2021-11-23 03:38:06,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-11-23 03:38:06,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 291. [2021-11-23 03:38:06,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 169 states have (on average 1.621301775147929) internal successors, (274), 258 states have internal predecessors, (274), 32 states have call successors, (32), 15 states have call predecessors, (32), 15 states have return successors, (24), 20 states have call predecessors, (24), 18 states have call successors, (24) [2021-11-23 03:38:07,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 330 transitions. [2021-11-23 03:38:07,001 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 330 transitions. Word has length 62 [2021-11-23 03:38:07,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:07,001 INFO L470 AbstractCegarLoop]: Abstraction has 291 states and 330 transitions. [2021-11-23 03:38:07,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 25 states have (on average 2.76) internal successors, (69), 25 states have internal predecessors, (69), 14 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-23 03:38:07,002 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 330 transitions. [2021-11-23 03:38:07,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 03:38:07,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:07,003 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 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] [2021-11-23 03:38:07,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 03:38:07,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:07,231 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ##fun~$Pointer$~TO~VOIDErr9REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:38:07,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:07,231 INFO L85 PathProgramCache]: Analyzing trace with hash -1992146569, now seen corresponding path program 1 times [2021-11-23 03:38:07,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:07,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362046999] [2021-11-23 03:38:07,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:07,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:07,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:07,605 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 41 proven. 7 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:38:07,605 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:07,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362046999] [2021-11-23 03:38:07,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [362046999] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:07,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717645343] [2021-11-23 03:38:07,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:07,606 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:07,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:07,606 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:07,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 03:38:07,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:07,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-23 03:38:07,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:07,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:38:08,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-23 03:38:08,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-23 03:38:08,326 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-23 03:38:08,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2021-11-23 03:38:08,351 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-23 03:38:08,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2021-11-23 03:38:08,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:38:08,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2021-11-23 03:38:08,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:38:08,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2021-11-23 03:38:08,498 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:38:08,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 78 treesize of output 69 [2021-11-23 03:38:08,513 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-11-23 03:38:08,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 67 treesize of output 58 [2021-11-23 03:38:08,602 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 03:38:08,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 54 [2021-11-23 03:38:08,607 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 03:38:08,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 32 [2021-11-23 03:38:08,682 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 39 proven. 20 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:38:08,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:38:34,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 162 treesize of output 158 [2021-11-23 03:38:34,068 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:38:34,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 137 treesize of output 136 [2021-11-23 03:38:34,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 254 treesize of output 250 [2021-11-23 03:38:34,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1023 treesize of output 983 [2021-11-23 03:38:35,666 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:38:35,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-23 03:38:36,385 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 32 proven. 27 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:38:36,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717645343] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:38:36,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1392313012] [2021-11-23 03:38:36,387 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-23 03:38:36,387 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:38:36,387 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:38:36,388 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:38:36,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17, 18] total 43 [2021-11-23 03:38:36,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118865409] [2021-11-23 03:38:36,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:38:36,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-23 03:38:36,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:36,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-23 03:38:36,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1717, Unknown=8, NotChecked=0, Total=1892 [2021-11-23 03:38:36,391 INFO L87 Difference]: Start difference. First operand 291 states and 330 transitions. Second operand has 44 states, 42 states have (on average 2.4523809523809526) internal successors, (103), 42 states have internal predecessors, (103), 7 states have call successors, (16), 4 states have call predecessors, (16), 5 states have return successors, (9), 7 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-23 03:38:39,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:39,470 INFO L93 Difference]: Finished difference Result 290 states and 329 transitions. [2021-11-23 03:38:39,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 03:38:39,470 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 2.4523809523809526) internal successors, (103), 42 states have internal predecessors, (103), 7 states have call successors, (16), 4 states have call predecessors, (16), 5 states have return successors, (9), 7 states have call predecessors, (9), 4 states have call successors, (9) Word has length 65 [2021-11-23 03:38:39,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:39,472 INFO L225 Difference]: With dead ends: 290 [2021-11-23 03:38:39,472 INFO L226 Difference]: Without dead ends: 290 [2021-11-23 03:38:39,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 746 ImplicationChecksByTransitivity, 27.5s TimeCoverageRelationStatistics Valid=557, Invalid=3095, Unknown=8, NotChecked=0, Total=3660 [2021-11-23 03:38:39,473 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 87 mSDsluCounter, 4656 mSDsCounter, 0 mSdLazyCounter, 2159 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 4344 SdHoareTripleChecker+Invalid, 3235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 2159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1030 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:39,474 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 4344 Invalid, 3235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 2159 Invalid, 0 Unknown, 1030 Unchecked, 1.7s Time] [2021-11-23 03:38:39,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-11-23 03:38:39,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 290. [2021-11-23 03:38:39,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 169 states have (on average 1.6153846153846154) internal successors, (273), 257 states have internal predecessors, (273), 32 states have call successors, (32), 15 states have call predecessors, (32), 15 states have return successors, (24), 20 states have call predecessors, (24), 18 states have call successors, (24) [2021-11-23 03:38:39,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 329 transitions. [2021-11-23 03:38:39,481 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 329 transitions. Word has length 65 [2021-11-23 03:38:39,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:39,482 INFO L470 AbstractCegarLoop]: Abstraction has 290 states and 329 transitions. [2021-11-23 03:38:39,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 2.4523809523809526) internal successors, (103), 42 states have internal predecessors, (103), 7 states have call successors, (16), 4 states have call predecessors, (16), 5 states have return successors, (9), 7 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-23 03:38:39,482 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 329 transitions. [2021-11-23 03:38:39,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 03:38:39,483 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:39,483 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1] [2021-11-23 03:38:39,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-23 03:38:39,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-23 03:38:39,711 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting dll_insert_masterErr14REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:38:39,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:39,711 INFO L85 PathProgramCache]: Analyzing trace with hash 1207597261, now seen corresponding path program 1 times [2021-11-23 03:38:39,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:39,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704304227] [2021-11-23 03:38:39,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:39,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:39,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:40,048 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-23 03:38:40,049 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:40,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704304227] [2021-11-23 03:38:40,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704304227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:40,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165284763] [2021-11-23 03:38:40,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:40,049 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:40,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:40,051 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:40,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 03:38:40,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:40,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 779 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 03:38:40,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:40,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:38:41,305 INFO L354 Elim1Store]: treesize reduction 93, result has 20.5 percent of original size [2021-11-23 03:38:41,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 36 treesize of output 45 [2021-11-23 03:38:41,759 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 74 proven. 13 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 03:38:41,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:38:42,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165284763] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:42,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [989933160] [2021-11-23 03:38:42,022 INFO L159 IcfgInterpreter]: Started Sifa with 36 locations of interest [2021-11-23 03:38:42,022 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:38:42,022 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:38:42,023 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:38:42,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 27 [2021-11-23 03:38:42,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982023249] [2021-11-23 03:38:42,024 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:38:42,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 03:38:42,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:42,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 03:38:42,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=746, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:38:42,026 INFO L87 Difference]: Start difference. First operand 290 states and 329 transitions. Second operand has 27 states, 23 states have (on average 3.4347826086956523) internal successors, (79), 23 states have internal predecessors, (79), 13 states have call successors, (18), 6 states have call predecessors, (18), 5 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-23 03:38:44,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:44,302 INFO L93 Difference]: Finished difference Result 298 states and 332 transitions. [2021-11-23 03:38:44,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 03:38:44,303 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 23 states have (on average 3.4347826086956523) internal successors, (79), 23 states have internal predecessors, (79), 13 states have call successors, (18), 6 states have call predecessors, (18), 5 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) Word has length 96 [2021-11-23 03:38:44,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:44,304 INFO L225 Difference]: With dead ends: 298 [2021-11-23 03:38:44,304 INFO L226 Difference]: Without dead ends: 298 [2021-11-23 03:38:44,305 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=239, Invalid=2113, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 03:38:44,305 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 108 mSDsluCounter, 2815 mSDsCounter, 0 mSdLazyCounter, 2263 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 2666 SdHoareTripleChecker+Invalid, 3039 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 709 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:44,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 2666 Invalid, 3039 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2263 Invalid, 0 Unknown, 709 Unchecked, 1.4s Time] [2021-11-23 03:38:44,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-23 03:38:44,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 294. [2021-11-23 03:38:44,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 172 states have (on average 1.6046511627906976) internal successors, (276), 260 states have internal predecessors, (276), 31 states have call successors, (31), 15 states have call predecessors, (31), 17 states have return successors, (23), 21 states have call predecessors, (23), 17 states have call successors, (23) [2021-11-23 03:38:44,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 330 transitions. [2021-11-23 03:38:44,314 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 330 transitions. Word has length 96 [2021-11-23 03:38:44,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:44,315 INFO L470 AbstractCegarLoop]: Abstraction has 294 states and 330 transitions. [2021-11-23 03:38:44,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 23 states have (on average 3.4347826086956523) internal successors, (79), 23 states have internal predecessors, (79), 13 states have call successors, (18), 6 states have call predecessors, (18), 5 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-23 03:38:44,315 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 330 transitions. [2021-11-23 03:38:44,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 03:38:44,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:44,316 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:44,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 03:38:44,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-23 03:38:44,531 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting dll_insert_masterErr15REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:38:44,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:44,531 INFO L85 PathProgramCache]: Analyzing trace with hash 175300355, now seen corresponding path program 1 times [2021-11-23 03:38:44,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:44,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388436774] [2021-11-23 03:38:44,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:44,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:44,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:45,615 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 78 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:38:45,615 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:45,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388436774] [2021-11-23 03:38:45,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1388436774] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:45,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250290992] [2021-11-23 03:38:45,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:45,616 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:45,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:45,620 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:45,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 03:38:45,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:45,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 03:38:45,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:46,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2021-11-23 03:38:46,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:38:46,725 INFO L354 Elim1Store]: treesize reduction 86, result has 21.1 percent of original size [2021-11-23 03:38:46,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 53 [2021-11-23 03:38:46,734 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-23 03:38:46,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 50 [2021-11-23 03:38:46,868 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 78 proven. 7 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 03:38:46,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:38:47,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250290992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:47,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1121000678] [2021-11-23 03:38:47,275 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2021-11-23 03:38:47,275 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:38:47,275 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:38:47,276 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:38:47,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14] total 29 [2021-11-23 03:38:47,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250085747] [2021-11-23 03:38:47,276 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:38:47,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 03:38:47,277 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:47,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 03:38:47,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=888, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:38:47,278 INFO L87 Difference]: Start difference. First operand 294 states and 330 transitions. Second operand has 30 states, 23 states have (on average 3.9565217391304346) internal successors, (91), 23 states have internal predecessors, (91), 12 states have call successors, (19), 7 states have call predecessors, (19), 6 states have return successors, (15), 10 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-23 03:38:49,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:49,625 INFO L93 Difference]: Finished difference Result 298 states and 329 transitions. [2021-11-23 03:38:49,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 03:38:49,631 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 23 states have (on average 3.9565217391304346) internal successors, (91), 23 states have internal predecessors, (91), 12 states have call successors, (19), 7 states have call predecessors, (19), 6 states have return successors, (15), 10 states have call predecessors, (15), 10 states have call successors, (15) Word has length 97 [2021-11-23 03:38:49,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:49,633 INFO L225 Difference]: With dead ends: 298 [2021-11-23 03:38:49,633 INFO L226 Difference]: Without dead ends: 298 [2021-11-23 03:38:49,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=264, Invalid=1992, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 03:38:49,633 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 322 mSDsluCounter, 2109 mSDsCounter, 0 mSdLazyCounter, 1822 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 2031 SdHoareTripleChecker+Invalid, 2768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 1822 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 833 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:49,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [324 Valid, 2031 Invalid, 2768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 1822 Invalid, 0 Unknown, 833 Unchecked, 1.5s Time] [2021-11-23 03:38:49,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-23 03:38:49,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 294. [2021-11-23 03:38:49,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 172 states have (on average 1.5988372093023255) internal successors, (275), 260 states have internal predecessors, (275), 31 states have call successors, (31), 15 states have call predecessors, (31), 17 states have return successors, (23), 21 states have call predecessors, (23), 17 states have call successors, (23) [2021-11-23 03:38:49,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 329 transitions. [2021-11-23 03:38:49,640 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 329 transitions. Word has length 97 [2021-11-23 03:38:49,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:49,640 INFO L470 AbstractCegarLoop]: Abstraction has 294 states and 329 transitions. [2021-11-23 03:38:49,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 23 states have (on average 3.9565217391304346) internal successors, (91), 23 states have internal predecessors, (91), 12 states have call successors, (19), 7 states have call predecessors, (19), 6 states have return successors, (15), 10 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-23 03:38:49,641 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 329 transitions. [2021-11-23 03:38:49,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 03:38:49,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:49,642 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:49,681 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 03:38:49,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-23 03:38:49,863 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting dll_insert_masterErr14REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:38:49,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:49,863 INFO L85 PathProgramCache]: Analyzing trace with hash 1662358503, now seen corresponding path program 1 times [2021-11-23 03:38:49,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:49,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911401315] [2021-11-23 03:38:49,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:49,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:49,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:51,303 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 105 proven. 11 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-23 03:38:51,303 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:51,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911401315] [2021-11-23 03:38:51,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [911401315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:51,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999813657] [2021-11-23 03:38:51,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:51,304 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:51,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:51,305 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:51,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 03:38:51,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:51,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 880 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-23 03:38:51,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:52,033 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 03:38:52,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 17 [2021-11-23 03:38:52,218 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:38:52,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 15 [2021-11-23 03:38:52,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:38:52,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:38:52,928 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:38:52,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 24 [2021-11-23 03:38:53,703 INFO L354 Elim1Store]: treesize reduction 275, result has 11.0 percent of original size [2021-11-23 03:38:53,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 12 case distinctions, treesize of input 77 treesize of output 89 [2021-11-23 03:38:54,008 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 98 proven. 51 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 03:38:54,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:38:54,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999813657] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:54,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [707303261] [2021-11-23 03:38:54,492 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2021-11-23 03:38:54,492 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:38:54,492 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:38:54,492 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:38:54,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 40 [2021-11-23 03:38:54,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899012507] [2021-11-23 03:38:54,493 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:38:54,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-23 03:38:54,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:54,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-23 03:38:54,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1563, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 03:38:54,494 INFO L87 Difference]: Start difference. First operand 294 states and 329 transitions. Second operand has 41 states, 33 states have (on average 3.515151515151515) internal successors, (116), 34 states have internal predecessors, (116), 16 states have call successors, (22), 6 states have call predecessors, (22), 9 states have return successors, (19), 15 states have call predecessors, (19), 13 states have call successors, (19) [2021-11-23 03:38:56,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:56,594 INFO L93 Difference]: Finished difference Result 360 states and 399 transitions. [2021-11-23 03:38:56,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 03:38:56,594 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 33 states have (on average 3.515151515151515) internal successors, (116), 34 states have internal predecessors, (116), 16 states have call successors, (22), 6 states have call predecessors, (22), 9 states have return successors, (19), 15 states have call predecessors, (19), 13 states have call successors, (19) Word has length 111 [2021-11-23 03:38:56,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:56,597 INFO L225 Difference]: With dead ends: 360 [2021-11-23 03:38:56,597 INFO L226 Difference]: Without dead ends: 360 [2021-11-23 03:38:56,597 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 104 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 691 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=289, Invalid=2573, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 03:38:56,598 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 196 mSDsluCounter, 2505 mSDsCounter, 0 mSdLazyCounter, 957 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 2505 SdHoareTripleChecker+Invalid, 1551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 957 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 560 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:56,598 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 2505 Invalid, 1551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 957 Invalid, 0 Unknown, 560 Unchecked, 0.9s Time] [2021-11-23 03:38:56,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2021-11-23 03:38:56,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 349. [2021-11-23 03:38:56,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 215 states have (on average 1.4930232558139536) internal successors, (321), 304 states have internal predecessors, (321), 36 states have call successors, (36), 20 states have call predecessors, (36), 24 states have return successors, (32), 27 states have call predecessors, (32), 22 states have call successors, (32) [2021-11-23 03:38:56,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 389 transitions. [2021-11-23 03:38:56,608 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 389 transitions. Word has length 111 [2021-11-23 03:38:56,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:56,609 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 389 transitions. [2021-11-23 03:38:56,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 33 states have (on average 3.515151515151515) internal successors, (116), 34 states have internal predecessors, (116), 16 states have call successors, (22), 6 states have call predecessors, (22), 9 states have return successors, (19), 15 states have call predecessors, (19), 13 states have call successors, (19) [2021-11-23 03:38:56,609 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 389 transitions. [2021-11-23 03:38:56,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 03:38:56,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:56,610 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:56,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 03:38:56,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:56,827 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting dll_insert_masterErr15REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:38:56,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:56,827 INFO L85 PathProgramCache]: Analyzing trace with hash 1662358504, now seen corresponding path program 1 times [2021-11-23 03:38:56,827 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:56,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950704169] [2021-11-23 03:38:56,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:56,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:56,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:59,798 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 49 proven. 91 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:38:59,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:59,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950704169] [2021-11-23 03:38:59,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950704169] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:59,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793723524] [2021-11-23 03:38:59,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:59,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:59,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:59,799 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:59,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 03:39:00,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:00,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 880 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-23 03:39:00,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:39:00,570 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 03:39:00,570 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 17 [2021-11-23 03:39:00,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-11-23 03:39:00,812 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:39:00,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 13 [2021-11-23 03:39:00,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:39:01,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:39:01,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:39:02,096 INFO L354 Elim1Store]: treesize reduction 164, result has 11.4 percent of original size [2021-11-23 03:39:02,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 78 treesize of output 86 [2021-11-23 03:39:02,110 INFO L354 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2021-11-23 03:39:02,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 83 treesize of output 81 [2021-11-23 03:39:02,375 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 91 proven. 33 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:39:02,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:39:02,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793723524] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:39:02,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016725635] [2021-11-23 03:39:02,947 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2021-11-23 03:39:02,947 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:39:02,948 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:39:02,949 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:39:02,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 21] total 54 [2021-11-23 03:39:02,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244336967] [2021-11-23 03:39:02,949 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:39:02,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 03:39:02,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:39:02,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 03:39:02,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=2928, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 03:39:02,951 INFO L87 Difference]: Start difference. First operand 349 states and 389 transitions. Second operand has 55 states, 43 states have (on average 3.0930232558139537) internal successors, (133), 46 states have internal predecessors, (133), 22 states have call successors, (26), 7 states have call predecessors, (26), 13 states have return successors, (22), 19 states have call predecessors, (22), 19 states have call successors, (22) [2021-11-23 03:39:11,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:39:11,095 INFO L93 Difference]: Finished difference Result 393 states and 435 transitions. [2021-11-23 03:39:11,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-23 03:39:11,096 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 43 states have (on average 3.0930232558139537) internal successors, (133), 46 states have internal predecessors, (133), 22 states have call successors, (26), 7 states have call predecessors, (26), 13 states have return successors, (22), 19 states have call predecessors, (22), 19 states have call successors, (22) Word has length 111 [2021-11-23 03:39:11,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:39:11,098 INFO L225 Difference]: With dead ends: 393 [2021-11-23 03:39:11,098 INFO L226 Difference]: Without dead ends: 393 [2021-11-23 03:39:11,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 125 SyntacticMatches, 6 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2259 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=666, Invalid=6816, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 03:39:11,099 INFO L933 BasicCegarLoop]: 181 mSDtfsCounter, 360 mSDsluCounter, 2048 mSDsCounter, 0 mSdLazyCounter, 2687 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 2023 SdHoareTripleChecker+Invalid, 3401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 2687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 600 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:39:11,099 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [362 Valid, 2023 Invalid, 3401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 2687 Invalid, 0 Unknown, 600 Unchecked, 2.9s Time] [2021-11-23 03:39:11,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2021-11-23 03:39:11,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 343. [2021-11-23 03:39:11,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 211 states have (on average 1.4976303317535544) internal successors, (316), 300 states have internal predecessors, (316), 36 states have call successors, (36), 20 states have call predecessors, (36), 22 states have return successors, (29), 25 states have call predecessors, (29), 22 states have call successors, (29) [2021-11-23 03:39:11,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 381 transitions. [2021-11-23 03:39:11,109 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 381 transitions. Word has length 111 [2021-11-23 03:39:11,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:39:11,109 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 381 transitions. [2021-11-23 03:39:11,110 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 43 states have (on average 3.0930232558139537) internal successors, (133), 46 states have internal predecessors, (133), 22 states have call successors, (26), 7 states have call predecessors, (26), 13 states have return successors, (22), 19 states have call predecessors, (22), 19 states have call successors, (22) [2021-11-23 03:39:11,110 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 381 transitions. [2021-11-23 03:39:11,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 03:39:11,111 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:39:11,111 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1] [2021-11-23 03:39:11,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 03:39:11,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-23 03:39:11,327 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting dll_create_genericErr1REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:39:11,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:39:11,327 INFO L85 PathProgramCache]: Analyzing trace with hash -1331066942, now seen corresponding path program 1 times [2021-11-23 03:39:11,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:39:11,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068498312] [2021-11-23 03:39:11,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:11,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:39:11,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:11,493 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 31 proven. 5 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-23 03:39:11,494 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:39:11,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068498312] [2021-11-23 03:39:11,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068498312] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:39:11,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226736562] [2021-11-23 03:39:11,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:11,494 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:39:11,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:39:11,499 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:39:11,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 03:39:11,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:11,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 797 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 03:39:11,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:39:11,955 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 29 proven. 9 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2021-11-23 03:39:11,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:39:12,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-23 03:39:12,138 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:39:12,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 10 [2021-11-23 03:39:12,154 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 03:39:12,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 17 [2021-11-23 03:39:12,474 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 31 proven. 5 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-23 03:39:12,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [226736562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:39:12,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [155066340] [2021-11-23 03:39:12,476 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2021-11-23 03:39:12,476 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:39:12,477 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:39:12,477 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:39:12,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 13 [2021-11-23 03:39:12,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683762667] [2021-11-23 03:39:12,477 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:39:12,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:39:12,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:39:12,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:39:12,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:39:12,479 INFO L87 Difference]: Start difference. First operand 343 states and 381 transitions. Second operand has 14 states, 10 states have (on average 6.0) internal successors, (60), 14 states have internal predecessors, (60), 6 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (14), 8 states have call predecessors, (14), 6 states have call successors, (14) [2021-11-23 03:39:13,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:39:13,038 INFO L93 Difference]: Finished difference Result 342 states and 380 transitions. [2021-11-23 03:39:13,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:39:13,039 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 10 states have (on average 6.0) internal successors, (60), 14 states have internal predecessors, (60), 6 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (14), 8 states have call predecessors, (14), 6 states have call successors, (14) Word has length 103 [2021-11-23 03:39:13,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:39:13,042 INFO L225 Difference]: With dead ends: 342 [2021-11-23 03:39:13,043 INFO L226 Difference]: Without dead ends: 342 [2021-11-23 03:39:13,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 201 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:39:13,043 INFO L933 BasicCegarLoop]: 185 mSDtfsCounter, 77 mSDsluCounter, 1374 mSDsCounter, 0 mSdLazyCounter, 606 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 1413 SdHoareTripleChecker+Invalid, 629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 606 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:39:13,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 1413 Invalid, 629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 606 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:39:13,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2021-11-23 03:39:13,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 342. [2021-11-23 03:39:13,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 211 states have (on average 1.4928909952606635) internal successors, (315), 299 states have internal predecessors, (315), 36 states have call successors, (36), 20 states have call predecessors, (36), 22 states have return successors, (29), 25 states have call predecessors, (29), 22 states have call successors, (29) [2021-11-23 03:39:13,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 380 transitions. [2021-11-23 03:39:13,053 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 380 transitions. Word has length 103 [2021-11-23 03:39:13,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:39:13,054 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 380 transitions. [2021-11-23 03:39:13,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 10 states have (on average 6.0) internal successors, (60), 14 states have internal predecessors, (60), 6 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (14), 8 states have call predecessors, (14), 6 states have call successors, (14) [2021-11-23 03:39:13,054 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 380 transitions. [2021-11-23 03:39:13,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 03:39:13,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:39:13,056 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 6, 6, 6, 6, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-23 03:39:13,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-23 03:39:13,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-23 03:39:13,282 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting dll_insert_masterErr12REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:39:13,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:39:13,283 INFO L85 PathProgramCache]: Analyzing trace with hash -467489353, now seen corresponding path program 1 times [2021-11-23 03:39:13,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:39:13,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611247470] [2021-11-23 03:39:13,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:13,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:39:13,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:16,990 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 141 proven. 56 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 03:39:16,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:39:16,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611247470] [2021-11-23 03:39:16,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611247470] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:39:16,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133394618] [2021-11-23 03:39:16,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:16,991 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:39:16,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:39:16,992 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:39:16,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 03:39:17,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:17,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 970 conjuncts, 129 conjunts are in the unsatisfiable core [2021-11-23 03:39:17,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:39:17,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:39:17,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-23 03:39:18,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-23 03:39:18,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-23 03:39:20,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 36 [2021-11-23 03:39:20,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 97 treesize of output 85 [2021-11-23 03:39:21,142 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 03:39:21,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 41 [2021-11-23 03:39:21,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2021-11-23 03:39:43,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 105 treesize of output 89 [2021-11-23 03:39:44,924 INFO L354 Elim1Store]: treesize reduction 292, result has 12.6 percent of original size [2021-11-23 03:39:44,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 14 case distinctions, treesize of input 84 treesize of output 101 [2021-11-23 03:39:45,153 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 153 proven. 43 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 03:39:45,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:39:46,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133394618] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:39:46,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1177131651] [2021-11-23 03:39:46,601 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2021-11-23 03:39:46,601 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:39:46,601 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:39:46,602 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:39:46,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 30] total 57 [2021-11-23 03:39:46,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341837478] [2021-11-23 03:39:46,603 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:39:46,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-23 03:39:46,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:39:46,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-23 03:39:46,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=3146, Unknown=10, NotChecked=0, Total=3422 [2021-11-23 03:39:46,605 INFO L87 Difference]: Start difference. First operand 342 states and 380 transitions. Second operand has 58 states, 53 states have (on average 2.490566037735849) internal successors, (132), 54 states have internal predecessors, (132), 12 states have call successors, (17), 3 states have call predecessors, (17), 11 states have return successors, (17), 13 states have call predecessors, (17), 12 states have call successors, (17) [2021-11-23 03:40:19,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:40:19,884 INFO L93 Difference]: Finished difference Result 370 states and 418 transitions. [2021-11-23 03:40:19,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 03:40:19,885 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 53 states have (on average 2.490566037735849) internal successors, (132), 54 states have internal predecessors, (132), 12 states have call successors, (17), 3 states have call predecessors, (17), 11 states have return successors, (17), 13 states have call predecessors, (17), 12 states have call successors, (17) Word has length 124 [2021-11-23 03:40:19,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:40:19,887 INFO L225 Difference]: With dead ends: 370 [2021-11-23 03:40:19,887 INFO L226 Difference]: Without dead ends: 370 [2021-11-23 03:40:19,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1659 ImplicationChecksByTransitivity, 57.2s TimeCoverageRelationStatistics Valid=490, Invalid=5969, Unknown=21, NotChecked=0, Total=6480 [2021-11-23 03:40:19,888 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 186 mSDsluCounter, 2799 mSDsCounter, 0 mSdLazyCounter, 3719 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 2639 SdHoareTripleChecker+Invalid, 5314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 3719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1526 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:40:19,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 2639 Invalid, 5314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 3719 Invalid, 0 Unknown, 1526 Unchecked, 4.1s Time] [2021-11-23 03:40:19,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-11-23 03:40:19,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 363. [2021-11-23 03:40:19,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 227 states have (on average 1.47136563876652) internal successors, (334), 315 states have internal predecessors, (334), 38 states have call successors, (38), 21 states have call predecessors, (38), 25 states have return successors, (36), 29 states have call predecessors, (36), 24 states have call successors, (36) [2021-11-23 03:40:19,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 408 transitions. [2021-11-23 03:40:19,899 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 408 transitions. Word has length 124 [2021-11-23 03:40:19,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:40:19,900 INFO L470 AbstractCegarLoop]: Abstraction has 363 states and 408 transitions. [2021-11-23 03:40:19,900 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 53 states have (on average 2.490566037735849) internal successors, (132), 54 states have internal predecessors, (132), 12 states have call successors, (17), 3 states have call predecessors, (17), 11 states have return successors, (17), 13 states have call predecessors, (17), 12 states have call successors, (17) [2021-11-23 03:40:19,900 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 408 transitions. [2021-11-23 03:40:19,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 03:40:19,901 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:40:19,902 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 6, 6, 6, 6, 4, 4, 4, 3, 3, 3, 3, 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] [2021-11-23 03:40:19,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 03:40:20,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-23 03:40:20,115 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting dll_insert_masterErr13REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:40:20,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:40:20,115 INFO L85 PathProgramCache]: Analyzing trace with hash -467489352, now seen corresponding path program 1 times [2021-11-23 03:40:20,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:40:20,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157131925] [2021-11-23 03:40:20,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:40:20,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:40:20,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:40:22,708 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 132 proven. 33 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 03:40:22,708 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:40:22,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157131925] [2021-11-23 03:40:22,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157131925] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:40:22,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577997985] [2021-11-23 03:40:22,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:40:22,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:40:22,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:40:22,709 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:40:22,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 03:40:22,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:40:22,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 970 conjuncts, 180 conjunts are in the unsatisfiable core [2021-11-23 03:40:22,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:40:23,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2021-11-23 03:40:23,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:40:23,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-23 03:40:23,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 22 [2021-11-23 03:40:23,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2021-11-23 03:40:27,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-23 03:40:28,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 79 treesize of output 59 [2021-11-23 03:40:28,234 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 03:40:28,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 40 [2021-11-23 03:40:28,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2021-11-23 03:40:33,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 25 [2021-11-23 03:40:33,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 102 treesize of output 82 [2021-11-23 03:40:34,149 INFO L354 Elim1Store]: treesize reduction 32, result has 3.0 percent of original size [2021-11-23 03:40:34,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 65 treesize of output 55 [2021-11-23 03:40:34,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2021-11-23 03:40:48,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 90 treesize of output 78 [2021-11-23 03:40:50,158 INFO L354 Elim1Store]: treesize reduction 260, result has 9.1 percent of original size [2021-11-23 03:40:50,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 5 case distinctions, treesize of input 96 treesize of output 106 [2021-11-23 03:40:50,166 INFO L354 Elim1Store]: treesize reduction 80, result has 1.2 percent of original size [2021-11-23 03:40:50,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 113 treesize of output 103 [2021-11-23 03:40:50,404 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 100 proven. 103 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:40:50,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:40:53,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577997985] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:40:53,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1860800675] [2021-11-23 03:40:53,707 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2021-11-23 03:40:53,708 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:40:53,708 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:40:53,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:40:53,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 33] total 46 [2021-11-23 03:40:53,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361174468] [2021-11-23 03:40:53,710 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:40:53,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-23 03:40:53,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:40:53,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-23 03:40:53,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2106, Unknown=12, NotChecked=0, Total=2352 [2021-11-23 03:40:53,712 INFO L87 Difference]: Start difference. First operand 363 states and 408 transitions. Second operand has 47 states, 41 states have (on average 3.1463414634146343) internal successors, (129), 42 states have internal predecessors, (129), 14 states have call successors, (19), 3 states have call predecessors, (19), 10 states have return successors, (20), 13 states have call predecessors, (20), 14 states have call successors, (20) [2021-11-23 03:41:14,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:14,033 INFO L93 Difference]: Finished difference Result 381 states and 430 transitions. [2021-11-23 03:41:14,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 03:41:14,033 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 41 states have (on average 3.1463414634146343) internal successors, (129), 42 states have internal predecessors, (129), 14 states have call successors, (19), 3 states have call predecessors, (19), 10 states have return successors, (20), 13 states have call predecessors, (20), 14 states have call successors, (20) Word has length 124 [2021-11-23 03:41:14,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:14,035 INFO L225 Difference]: With dead ends: 381 [2021-11-23 03:41:14,035 INFO L226 Difference]: Without dead ends: 381 [2021-11-23 03:41:14,035 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1242 ImplicationChecksByTransitivity, 42.8s TimeCoverageRelationStatistics Valid=451, Invalid=4498, Unknown=21, NotChecked=0, Total=4970 [2021-11-23 03:41:14,036 INFO L933 BasicCegarLoop]: 173 mSDtfsCounter, 208 mSDsluCounter, 1766 mSDsCounter, 0 mSdLazyCounter, 2663 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 1717 SdHoareTripleChecker+Invalid, 3874 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 2663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1128 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:14,036 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 1717 Invalid, 3874 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 2663 Invalid, 0 Unknown, 1128 Unchecked, 2.9s Time] [2021-11-23 03:41:14,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 381 states. [2021-11-23 03:41:14,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 381 to 361. [2021-11-23 03:41:14,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 226 states have (on average 1.4646017699115044) internal successors, (331), 314 states have internal predecessors, (331), 37 states have call successors, (37), 21 states have call predecessors, (37), 25 states have return successors, (35), 28 states have call predecessors, (35), 23 states have call successors, (35) [2021-11-23 03:41:14,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 403 transitions. [2021-11-23 03:41:14,047 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 403 transitions. Word has length 124 [2021-11-23 03:41:14,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:14,047 INFO L470 AbstractCegarLoop]: Abstraction has 361 states and 403 transitions. [2021-11-23 03:41:14,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 41 states have (on average 3.1463414634146343) internal successors, (129), 42 states have internal predecessors, (129), 14 states have call successors, (19), 3 states have call predecessors, (19), 10 states have return successors, (20), 13 states have call predecessors, (20), 14 states have call successors, (20) [2021-11-23 03:41:14,048 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 403 transitions. [2021-11-23 03:41:14,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 03:41:14,049 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:14,049 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 6, 6, 6, 6, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:14,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 03:41:14,262 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-11-23 03:41:14,263 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting dll_insert_masterErr14REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:41:14,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:14,263 INFO L85 PathProgramCache]: Analyzing trace with hash -1607248884, now seen corresponding path program 2 times [2021-11-23 03:41:14,263 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:14,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830829883] [2021-11-23 03:41:14,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:14,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:14,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:16,566 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 132 proven. 18 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 03:41:16,566 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:16,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830829883] [2021-11-23 03:41:16,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830829883] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:16,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683165857] [2021-11-23 03:41:16,567 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:41:16,567 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:16,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:16,569 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:41:16,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 03:41:29,303 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:41:29,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:41:29,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 977 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 03:41:29,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:41:29,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-11-23 03:41:30,981 INFO L354 Elim1Store]: treesize reduction 252, result has 14.3 percent of original size [2021-11-23 03:41:30,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 6 case distinctions, treesize of input 52 treesize of output 73 [2021-11-23 03:41:32,384 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 140 proven. 22 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-23 03:41:32,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:41:32,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [683165857] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:32,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1802305787] [2021-11-23 03:41:32,802 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2021-11-23 03:41:32,802 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:41:32,803 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:41:32,804 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:41:32,804 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18] total 27 [2021-11-23 03:41:32,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295349478] [2021-11-23 03:41:32,804 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:41:32,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 03:41:32,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:32,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 03:41:32,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=695, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:41:32,806 INFO L87 Difference]: Start difference. First operand 361 states and 403 transitions. Second operand has 28 states, 22 states have (on average 3.909090909090909) internal successors, (86), 24 states have internal predecessors, (86), 13 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (18), 14 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-23 03:41:35,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:35,044 INFO L93 Difference]: Finished difference Result 365 states and 410 transitions. [2021-11-23 03:41:35,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:41:35,045 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 22 states have (on average 3.909090909090909) internal successors, (86), 24 states have internal predecessors, (86), 13 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (18), 14 states have call predecessors, (18), 12 states have call successors, (18) Word has length 125 [2021-11-23 03:41:35,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:35,047 INFO L225 Difference]: With dead ends: 365 [2021-11-23 03:41:35,047 INFO L226 Difference]: Without dead ends: 365 [2021-11-23 03:41:35,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=211, Invalid=1349, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 03:41:35,048 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 162 mSDsluCounter, 1766 mSDsCounter, 0 mSdLazyCounter, 1575 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 1742 SdHoareTripleChecker+Invalid, 2155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 1575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 541 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:35,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 1742 Invalid, 2155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 1575 Invalid, 0 Unknown, 541 Unchecked, 1.9s Time] [2021-11-23 03:41:35,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2021-11-23 03:41:35,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 363. [2021-11-23 03:41:35,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 228 states have (on average 1.469298245614035) internal successors, (335), 316 states have internal predecessors, (335), 37 states have call successors, (37), 21 states have call predecessors, (37), 25 states have return successors, (35), 28 states have call predecessors, (35), 23 states have call successors, (35) [2021-11-23 03:41:35,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 407 transitions. [2021-11-23 03:41:35,057 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 407 transitions. Word has length 125 [2021-11-23 03:41:35,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:35,058 INFO L470 AbstractCegarLoop]: Abstraction has 363 states and 407 transitions. [2021-11-23 03:41:35,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 22 states have (on average 3.909090909090909) internal successors, (86), 24 states have internal predecessors, (86), 13 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (18), 14 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-23 03:41:35,058 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 407 transitions. [2021-11-23 03:41:35,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 03:41:35,059 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:35,059 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 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] [2021-11-23 03:41:35,101 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-23 03:41:35,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-23 03:41:35,275 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting dll_insert_masterErr15REQUIRES_VIOLATION === [dll_insert_masterErr0REQUIRES_VIOLATION, dll_insert_masterErr1REQUIRES_VIOLATION, dll_insert_masterErr2REQUIRES_VIOLATION (and 95 more)] === [2021-11-23 03:41:35,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:35,275 INFO L85 PathProgramCache]: Analyzing trace with hash -1767470999, now seen corresponding path program 2 times [2021-11-23 03:41:35,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:35,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708398801] [2021-11-23 03:41:35,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:35,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:35,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:37,226 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-23 03:41:37,226 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:37,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708398801] [2021-11-23 03:41:37,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708398801] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:37,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2118577637] [2021-11-23 03:41:37,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:41:37,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:37,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:37,227 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:41:37,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c980cbd-924a-424d-8c66-586823d7f405/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 03:41:39,422 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:41:39,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:41:39,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 605 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-23 03:41:39,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:41:39,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:41:39,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:41:39,667 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 03:41:39,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 03:41:39,679 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 03:41:39,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 27 [2021-11-23 03:41:39,956 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:41:39,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 23 [2021-11-23 03:41:39,960 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:41:39,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 13 [2021-11-23 03:41:40,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-23 03:41:40,227 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:41:40,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 03:41:40,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-23 03:41:40,613 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:41:40,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 03:41:51,501 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-23 03:41:51,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 67 [2021-11-23 03:41:51,970 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:41:51,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 03:41:53,521 INFO L354 Elim1Store]: treesize reduction 346, result has 12.4 percent of original size [2021-11-23 03:41:53,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 7 case distinctions, treesize of input 92 treesize of output 123 [2021-11-23 03:41:53,565 INFO L354 Elim1Store]: treesize reduction 40, result has 18.4 percent of original size [2021-11-23 03:41:53,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 118 treesize of output 118 [2021-11-23 03:42:00,015 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 3 proven. 76 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:42:00,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:42:01,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 300 treesize of output 292 [2021-11-23 03:42:02,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2118577637] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:42:02,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1582027365] [2021-11-23 03:42:02,321 INFO L159 IcfgInterpreter]: Started Sifa with 36 locations of interest [2021-11-23 03:42:02,321 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:42:02,322 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:42:02,323 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:42:02,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 30] total 45 [2021-11-23 03:42:02,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226683686] [2021-11-23 03:42:02,323 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:42:02,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 03:42:02,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:02,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 03:42:02,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=2064, Unknown=5, NotChecked=0, Total=2256 [2021-11-23 03:42:02,325 INFO L87 Difference]: Start difference. First operand 363 states and 407 transitions. Second operand has 46 states, 39 states have (on average 2.3846153846153846) internal successors, (93), 39 states have internal predecessors, (93), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (12), 12 states have call predecessors, (12), 11 states have call successors, (12)