./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 4cb6276eff0c60579b1d5f7034948eb4f53891709ff48cdd11b3329ec3c4cc2e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:22:07,269 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:22:07,271 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:22:07,300 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:22:07,301 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:22:07,302 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:22:07,304 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:22:07,306 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:22:07,308 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:22:07,309 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:22:07,310 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:22:07,312 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:22:07,312 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:22:07,313 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:22:07,315 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:22:07,316 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:22:07,317 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:22:07,318 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:22:07,320 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:22:07,323 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:22:07,325 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:22:07,327 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:22:07,328 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:22:07,329 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:22:07,333 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:22:07,333 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:22:07,334 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:22:07,335 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:22:07,336 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:22:07,337 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:22:07,337 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:22:07,338 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:22:07,339 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:22:07,340 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:22:07,341 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:22:07,342 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:22:07,343 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:22:07,343 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:22:07,343 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:22:07,345 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:22:07,345 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:22:07,346 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-21 00:22:07,371 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:22:07,377 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:22:07,377 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:22:07,377 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:22:07,378 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:22:07,378 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:22:07,379 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:22:07,379 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:22:07,379 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:22:07,379 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:22:07,379 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:22:07,380 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:22:07,380 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:22:07,380 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:22:07,381 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:22:07,381 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:22:07,381 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:22:07,381 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:22:07,382 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-21 00:22:07,382 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-21 00:22:07,383 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:22:07,383 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:22:07,383 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-21 00:22:07,383 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:22:07,384 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:22:07,384 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:22:07,384 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-21 00:22:07,384 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-21 00:22:07,385 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-21 00:22:07,385 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:22:07,386 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-21 00:22:07,386 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:22:07,386 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:22:07,386 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:22:07,386 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:22:07,387 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:22:07,388 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:22:07,388 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:22:07,388 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:22:07,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:22:07,390 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:22:07,390 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:22:07,390 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_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4cb6276eff0c60579b1d5f7034948eb4f53891709ff48cdd11b3329ec3c4cc2e [2021-11-21 00:22:07,648 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:22:07,673 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:22:07,675 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:22:07,676 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:22:07,677 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:22:07,679 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i [2021-11-21 00:22:07,749 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/data/e3eabe96a/fe7e4001a142434fb0ac18ac59dc067d/FLAG3b724d36b [2021-11-21 00:22:08,305 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:22:08,305 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/sv-benchmarks/c/array-memsafety/substring-alloca-2.i [2021-11-21 00:22:08,317 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/data/e3eabe96a/fe7e4001a142434fb0ac18ac59dc067d/FLAG3b724d36b [2021-11-21 00:22:08,608 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/data/e3eabe96a/fe7e4001a142434fb0ac18ac59dc067d [2021-11-21 00:22:08,611 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:22:08,612 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:22:08,614 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:22:08,614 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:22:08,617 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:22:08,618 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:22:08" (1/1) ... [2021-11-21 00:22:08,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fa8e644 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:08, skipping insertion in model container [2021-11-21 00:22:08,620 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:22:08" (1/1) ... [2021-11-21 00:22:08,627 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:22:08,668 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:22:08,984 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:22:08,991 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:22:09,029 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:22:09,069 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:22:09,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09 WrapperNode [2021-11-21 00:22:09,070 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:22:09,071 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:22:09,072 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:22:09,072 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:22:09,081 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (1/1) ... [2021-11-21 00:22:09,094 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (1/1) ... [2021-11-21 00:22:09,119 INFO L137 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 103 [2021-11-21 00:22:09,119 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:22:09,120 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:22:09,120 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:22:09,121 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:22:09,129 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (1/1) ... [2021-11-21 00:22:09,129 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (1/1) ... [2021-11-21 00:22:09,133 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (1/1) ... [2021-11-21 00:22:09,133 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (1/1) ... [2021-11-21 00:22:09,141 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (1/1) ... [2021-11-21 00:22:09,157 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (1/1) ... [2021-11-21 00:22:09,158 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (1/1) ... [2021-11-21 00:22:09,161 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:22:09,162 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:22:09,163 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:22:09,163 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:22:09,178 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (1/1) ... [2021-11-21 00:22:09,186 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:22:09,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:09,219 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:22:09,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:22:09,268 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:22:09,270 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:22:09,271 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 00:22:09,271 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:22:09,271 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:22:09,271 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:22:09,398 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:22:09,400 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:22:09,654 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:22:09,697 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:22:09,697 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-21 00:22:09,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:22:09 BoogieIcfgContainer [2021-11-21 00:22:09,703 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:22:09,705 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:22:09,705 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:22:09,711 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:22:09,711 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:22:08" (1/3) ... [2021-11-21 00:22:09,712 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46c92226 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:22:09, skipping insertion in model container [2021-11-21 00:22:09,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:22:09" (2/3) ... [2021-11-21 00:22:09,712 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46c92226 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:22:09, skipping insertion in model container [2021-11-21 00:22:09,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:22:09" (3/3) ... [2021-11-21 00:22:09,714 INFO L111 eAbstractionObserver]: Analyzing ICFG substring-alloca-2.i [2021-11-21 00:22:09,720 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:22:09,720 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2021-11-21 00:22:09,772 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:22:09,779 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 [2021-11-21 00:22:09,780 INFO L340 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2021-11-21 00:22:09,794 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:09,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:22:09,801 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:09,802 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:22:09,802 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:09,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:09,808 INFO L85 PathProgramCache]: Analyzing trace with hash 158342, now seen corresponding path program 1 times [2021-11-21 00:22:09,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:09,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034425838] [2021-11-21 00:22:09,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:09,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:09,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:09,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:09,995 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:09,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034425838] [2021-11-21 00:22:09,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034425838] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:09,996 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:09,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:22:10,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158574015] [2021-11-21 00:22:10,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:10,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:22:10,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:10,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:22:10,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:10,080 INFO L87 Difference]: Start difference. First operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:10,167 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2021-11-21 00:22:10,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:22:10,170 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-21 00:22:10,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:10,178 INFO L225 Difference]: With dead ends: 37 [2021-11-21 00:22:10,178 INFO L226 Difference]: Without dead ends: 36 [2021-11-21 00:22:10,180 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:10,185 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:10,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 19 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:10,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-21 00:22:10,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-21 00:22:10,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-11-21 00:22:10,222 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 3 [2021-11-21 00:22:10,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:10,222 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-11-21 00:22:10,223 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,223 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-11-21 00:22:10,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:22:10,223 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:10,224 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:22:10,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:22:10,224 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:10,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:10,225 INFO L85 PathProgramCache]: Analyzing trace with hash 158343, now seen corresponding path program 1 times [2021-11-21 00:22:10,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:10,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479005991] [2021-11-21 00:22:10,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:10,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:10,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:10,321 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:10,321 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:10,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479005991] [2021-11-21 00:22:10,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479005991] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:10,322 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:10,322 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:22:10,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010494881] [2021-11-21 00:22:10,323 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:10,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:22:10,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:10,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:22:10,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:22:10,325 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:10,423 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2021-11-21 00:22:10,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:22:10,423 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-21 00:22:10,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:10,425 INFO L225 Difference]: With dead ends: 70 [2021-11-21 00:22:10,425 INFO L226 Difference]: Without dead ends: 70 [2021-11-21 00:22:10,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:22:10,427 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 38 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:10,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 58 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:10,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-21 00:22:10,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 38. [2021-11-21 00:22:10,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2021-11-21 00:22:10,435 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 3 [2021-11-21 00:22:10,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:10,435 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2021-11-21 00:22:10,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,436 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2021-11-21 00:22:10,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 00:22:10,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:10,436 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 00:22:10,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:22:10,437 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:10,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:10,437 INFO L85 PathProgramCache]: Analyzing trace with hash 5013776, now seen corresponding path program 1 times [2021-11-21 00:22:10,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:10,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143694608] [2021-11-21 00:22:10,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:10,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:10,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:10,533 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:10,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:10,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143694608] [2021-11-21 00:22:10,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143694608] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:10,534 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:10,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:22:10,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629394105] [2021-11-21 00:22:10,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:10,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:22:10,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:10,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:22:10,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:10,536 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:10,577 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-11-21 00:22:10,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:22:10,578 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-21 00:22:10,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:10,579 INFO L225 Difference]: With dead ends: 37 [2021-11-21 00:22:10,579 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 00:22:10,579 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:10,581 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:10,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 19 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:10,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 00:22:10,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-21 00:22:10,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-11-21 00:22:10,586 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 4 [2021-11-21 00:22:10,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:10,587 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-11-21 00:22:10,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,587 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-11-21 00:22:10,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 00:22:10,588 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:10,588 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 00:22:10,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:22:10,588 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:10,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:10,589 INFO L85 PathProgramCache]: Analyzing trace with hash 5011007, now seen corresponding path program 1 times [2021-11-21 00:22:10,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:10,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307499584] [2021-11-21 00:22:10,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:10,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:10,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:10,617 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:10,617 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:10,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307499584] [2021-11-21 00:22:10,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307499584] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:10,618 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:10,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:22:10,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725180718] [2021-11-21 00:22:10,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:10,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:22:10,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:10,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:22:10,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:10,620 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:10,663 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2021-11-21 00:22:10,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:22:10,664 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-21 00:22:10,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:10,667 INFO L225 Difference]: With dead ends: 35 [2021-11-21 00:22:10,667 INFO L226 Difference]: Without dead ends: 35 [2021-11-21 00:22:10,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:10,669 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 33 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:10,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 18 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:10,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-21 00:22:10,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-21 00:22:10,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 34 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-11-21 00:22:10,682 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 4 [2021-11-21 00:22:10,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:10,682 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-11-21 00:22:10,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,683 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-11-21 00:22:10,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 00:22:10,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:10,683 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 00:22:10,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 00:22:10,684 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:10,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:10,685 INFO L85 PathProgramCache]: Analyzing trace with hash 5011008, now seen corresponding path program 1 times [2021-11-21 00:22:10,685 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:10,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346540268] [2021-11-21 00:22:10,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:10,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:10,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:10,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:10,754 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:10,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346540268] [2021-11-21 00:22:10,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346540268] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:10,755 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:10,755 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:22:10,756 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281346674] [2021-11-21 00:22:10,756 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:10,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:22:10,757 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:10,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:22:10,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:22:10,758 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:10,832 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-11-21 00:22:10,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:22:10,833 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-21 00:22:10,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:10,834 INFO L225 Difference]: With dead ends: 63 [2021-11-21 00:22:10,834 INFO L226 Difference]: Without dead ends: 63 [2021-11-21 00:22:10,835 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:22:10,836 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 68 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:10,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 51 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:10,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-21 00:22:10,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 37. [2021-11-21 00:22:10,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 36 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2021-11-21 00:22:10,843 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 4 [2021-11-21 00:22:10,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:10,843 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2021-11-21 00:22:10,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,844 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2021-11-21 00:22:10,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:22:10,844 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:10,845 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 00:22:10,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:22:10,845 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:10,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:10,846 INFO L85 PathProgramCache]: Analyzing trace with hash 155427050, now seen corresponding path program 1 times [2021-11-21 00:22:10,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:10,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066922749] [2021-11-21 00:22:10,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:10,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:10,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:10,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:10,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:10,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066922749] [2021-11-21 00:22:10,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066922749] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:10,938 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:10,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:22:10,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097321715] [2021-11-21 00:22:10,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:10,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:22:10,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:10,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:22:10,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:10,951 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:10,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:10,983 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2021-11-21 00:22:10,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:22:10,984 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-21 00:22:10,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:10,986 INFO L225 Difference]: With dead ends: 36 [2021-11-21 00:22:10,987 INFO L226 Difference]: Without dead ends: 36 [2021-11-21 00:22:10,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:10,992 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 33 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:10,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 17 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:10,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-21 00:22:11,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-21 00:22:11,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 35 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:11,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2021-11-21 00:22:11,004 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 5 [2021-11-21 00:22:11,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:11,005 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2021-11-21 00:22:11,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:11,005 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2021-11-21 00:22:11,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:22:11,006 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:11,006 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-21 00:22:11,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 00:22:11,006 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:11,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:11,007 INFO L85 PathProgramCache]: Analyzing trace with hash 152263501, now seen corresponding path program 1 times [2021-11-21 00:22:11,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:11,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685993888] [2021-11-21 00:22:11,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:11,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:11,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:11,081 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:11,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:11,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685993888] [2021-11-21 00:22:11,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685993888] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:11,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712196492] [2021-11-21 00:22:11,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:11,083 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:11,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:11,085 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:11,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:22:11,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:11,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 00:22:11,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:11,240 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:22:11,241 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:22:11,252 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 15 treesize of output 13 [2021-11-21 00:22:11,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:11,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:11,576 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:11,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1712196492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:11,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1829526888] [2021-11-21 00:22:11,594 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-21 00:22:11,594 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:11,599 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:11,604 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:11,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:11,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:11,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:22:11,977 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 20 treesize of output 16 [2021-11-21 00:22:12,381 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:12,381 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 194 treesize of output 193 [2021-11-21 00:22:13,074 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 23 treesize of output 19 [2021-11-21 00:22:13,315 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 23 treesize of output 19 [2021-11-21 00:22:13,530 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:13,961 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:13,962 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:13,962 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2021-11-21 00:22:13,962 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143385793] [2021-11-21 00:22:13,962 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:13,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 00:22:13,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:13,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 00:22:13,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:22:13,964 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand has 9 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:14,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:14,157 INFO L93 Difference]: Finished difference Result 96 states and 114 transitions. [2021-11-21 00:22:14,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:22:14,157 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-21 00:22:14,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:14,158 INFO L225 Difference]: With dead ends: 96 [2021-11-21 00:22:14,158 INFO L226 Difference]: Without dead ends: 96 [2021-11-21 00:22:14,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:22:14,160 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 200 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:14,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 170 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:14,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-21 00:22:14,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 33. [2021-11-21 00:22:14,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:14,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-11-21 00:22:14,165 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 5 [2021-11-21 00:22:14,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:14,166 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-11-21 00:22:14,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:14,166 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-11-21 00:22:14,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 00:22:14,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:14,167 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 00:22:14,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:14,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:14,368 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:14,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:14,368 INFO L85 PathProgramCache]: Analyzing trace with hash 523273240, now seen corresponding path program 1 times [2021-11-21 00:22:14,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:14,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584328801] [2021-11-21 00:22:14,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:14,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:14,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:14,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:14,418 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:14,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584328801] [2021-11-21 00:22:14,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [584328801] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:14,418 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:14,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:22:14,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300241040] [2021-11-21 00:22:14,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:14,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:22:14,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:14,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:22:14,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:22:14,420 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:14,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:14,485 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2021-11-21 00:22:14,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:22:14,485 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 00:22:14,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:14,486 INFO L225 Difference]: With dead ends: 55 [2021-11-21 00:22:14,486 INFO L226 Difference]: Without dead ends: 55 [2021-11-21 00:22:14,486 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:22:14,487 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 83 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:14,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 30 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:14,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-21 00:22:14,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 34. [2021-11-21 00:22:14,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 33 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:14,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2021-11-21 00:22:14,498 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 6 [2021-11-21 00:22:14,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:14,498 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2021-11-21 00:22:14,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:14,499 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2021-11-21 00:22:14,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 00:22:14,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:14,499 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 00:22:14,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-21 00:22:14,500 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:14,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:14,500 INFO L85 PathProgramCache]: Analyzing trace with hash 523273239, now seen corresponding path program 1 times [2021-11-21 00:22:14,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:14,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212413733] [2021-11-21 00:22:14,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:14,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:14,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:14,562 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:14,562 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:14,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212413733] [2021-11-21 00:22:14,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212413733] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:14,563 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:14,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:22:14,563 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116150382] [2021-11-21 00:22:14,563 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:14,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:22:14,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:14,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:22:14,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:22:14,564 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:14,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:14,600 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2021-11-21 00:22:14,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:22:14,601 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 00:22:14,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:14,601 INFO L225 Difference]: With dead ends: 33 [2021-11-21 00:22:14,602 INFO L226 Difference]: Without dead ends: 33 [2021-11-21 00:22:14,602 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 [2021-11-21 00:22:14,603 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 52 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:14,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 18 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:14,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-21 00:22:14,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-21 00:22:14,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:14,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-11-21 00:22:14,606 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 6 [2021-11-21 00:22:14,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:14,607 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-11-21 00:22:14,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:14,607 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-11-21 00:22:14,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 00:22:14,607 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:14,607 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2021-11-21 00:22:14,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 00:22:14,608 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:14,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:14,608 INFO L85 PathProgramCache]: Analyzing trace with hash 520684782, now seen corresponding path program 1 times [2021-11-21 00:22:14,608 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:14,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658694516] [2021-11-21 00:22:14,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:14,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:14,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:14,688 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:14,688 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:14,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658694516] [2021-11-21 00:22:14,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [658694516] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:14,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10624562] [2021-11-21 00:22:14,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:14,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:14,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:14,690 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:14,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:22:14,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:14,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:22:14,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:14,765 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:22:14,766 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 00:22:14,817 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:14,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:15,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:15,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10624562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:15,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1610414917] [2021-11-21 00:22:15,045 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 00:22:15,045 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:15,045 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:15,046 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:15,046 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:15,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:15,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:22:15,478 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 20 treesize of output 16 [2021-11-21 00:22:15,745 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:15,746 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 210 treesize of output 209 [2021-11-21 00:22:16,572 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 23 treesize of output 19 [2021-11-21 00:22:16,794 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 23 treesize of output 19 [2021-11-21 00:22:17,044 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:17,527 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:17,527 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:17,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-11-21 00:22:17,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783672320] [2021-11-21 00:22:17,529 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:17,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 00:22:17,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:17,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 00:22:17,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:22:17,530 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:17,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:17,708 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2021-11-21 00:22:17,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:22:17,709 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 00:22:17,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:17,710 INFO L225 Difference]: With dead ends: 83 [2021-11-21 00:22:17,710 INFO L226 Difference]: Without dead ends: 83 [2021-11-21 00:22:17,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=77, Invalid=229, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:22:17,711 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 285 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:17,711 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [285 Valid, 138 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:17,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-21 00:22:17,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 30. [2021-11-21 00:22:17,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.75) internal successors, (35), 29 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:17,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2021-11-21 00:22:17,715 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 6 [2021-11-21 00:22:17,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:17,715 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2021-11-21 00:22:17,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:17,715 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2021-11-21 00:22:17,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:22:17,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:17,716 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:17,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:17,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:17,930 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:17,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:17,930 INFO L85 PathProgramCache]: Analyzing trace with hash 354410300, now seen corresponding path program 1 times [2021-11-21 00:22:17,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:17,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712976682] [2021-11-21 00:22:17,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:17,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:17,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:17,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:17,964 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:17,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712976682] [2021-11-21 00:22:17,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712976682] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:17,965 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:17,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:22:17,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528188933] [2021-11-21 00:22:17,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:17,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:22:17,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:17,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:22:17,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:22:17,967 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:18,008 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2021-11-21 00:22:18,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:22:18,009 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 00:22:18,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:18,009 INFO L225 Difference]: With dead ends: 30 [2021-11-21 00:22:18,009 INFO L226 Difference]: Without dead ends: 30 [2021-11-21 00:22:18,010 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 [2021-11-21 00:22:18,011 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 36 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:18,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 21 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:18,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-21 00:22:18,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2021-11-21 00:22:18,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.6) internal successors, (32), 26 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2021-11-21 00:22:18,019 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 8 [2021-11-21 00:22:18,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:18,019 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2021-11-21 00:22:18,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,019 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2021-11-21 00:22:18,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:22:18,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:18,020 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:18,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-21 00:22:18,021 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:18,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:18,022 INFO L85 PathProgramCache]: Analyzing trace with hash 354410301, now seen corresponding path program 1 times [2021-11-21 00:22:18,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:18,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712631380] [2021-11-21 00:22:18,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:18,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:18,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:18,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:18,079 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:18,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712631380] [2021-11-21 00:22:18,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712631380] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:18,079 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:18,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:22:18,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141829164] [2021-11-21 00:22:18,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:18,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:22:18,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:18,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:22:18,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:22:18,081 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:18,151 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2021-11-21 00:22:18,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:22:18,151 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 00:22:18,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:18,152 INFO L225 Difference]: With dead ends: 43 [2021-11-21 00:22:18,152 INFO L226 Difference]: Without dead ends: 43 [2021-11-21 00:22:18,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:22:18,153 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 89 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:18,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 27 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:18,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-21 00:22:18,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2021-11-21 00:22:18,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 32 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2021-11-21 00:22:18,156 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 8 [2021-11-21 00:22:18,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:18,156 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2021-11-21 00:22:18,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,156 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2021-11-21 00:22:18,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 00:22:18,157 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:18,157 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:18,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-21 00:22:18,157 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:18,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:18,158 INFO L85 PathProgramCache]: Analyzing trace with hash 1285859555, now seen corresponding path program 1 times [2021-11-21 00:22:18,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:18,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445208258] [2021-11-21 00:22:18,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:18,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:18,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:18,211 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:18,212 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:18,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445208258] [2021-11-21 00:22:18,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445208258] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:18,212 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:18,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:22:18,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302726190] [2021-11-21 00:22:18,213 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:18,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:22:18,214 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:18,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:22:18,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:22:18,214 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:18,236 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2021-11-21 00:22:18,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:22:18,237 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-21 00:22:18,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:18,237 INFO L225 Difference]: With dead ends: 32 [2021-11-21 00:22:18,237 INFO L226 Difference]: Without dead ends: 29 [2021-11-21 00:22:18,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:22:18,238 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 21 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:18,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 32 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:18,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-21 00:22:18,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-21 00:22:18,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 23 states have (on average 1.608695652173913) internal successors, (37), 28 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2021-11-21 00:22:18,241 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 10 [2021-11-21 00:22:18,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:18,241 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2021-11-21 00:22:18,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,242 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2021-11-21 00:22:18,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 00:22:18,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:18,242 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:18,242 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-21 00:22:18,243 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr14REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:18,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:18,243 INFO L85 PathProgramCache]: Analyzing trace with hash 1209053803, now seen corresponding path program 1 times [2021-11-21 00:22:18,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:18,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478018347] [2021-11-21 00:22:18,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:18,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:18,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:18,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:18,274 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:18,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478018347] [2021-11-21 00:22:18,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478018347] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:18,274 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:18,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:22:18,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503717436] [2021-11-21 00:22:18,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:18,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:22:18,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:18,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:22:18,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:22:18,279 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:18,321 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2021-11-21 00:22:18,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:22:18,322 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 00:22:18,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:18,323 INFO L225 Difference]: With dead ends: 29 [2021-11-21 00:22:18,323 INFO L226 Difference]: Without dead ends: 29 [2021-11-21 00:22:18,323 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 [2021-11-21 00:22:18,324 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 23 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:18,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 14 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:18,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-21 00:22:18,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-11-21 00:22:18,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-11-21 00:22:18,330 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 11 [2021-11-21 00:22:18,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:18,330 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-11-21 00:22:18,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,330 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-11-21 00:22:18,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 00:22:18,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:18,332 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:18,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-21 00:22:18,332 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:18,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:18,333 INFO L85 PathProgramCache]: Analyzing trace with hash 1209053804, now seen corresponding path program 1 times [2021-11-21 00:22:18,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:18,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141139299] [2021-11-21 00:22:18,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:18,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:18,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:18,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:18,415 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:18,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141139299] [2021-11-21 00:22:18,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2141139299] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:18,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:18,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:22:18,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643553345] [2021-11-21 00:22:18,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:18,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:22:18,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:18,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:22:18,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:22:18,416 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:18,501 INFO L93 Difference]: Finished difference Result 50 states and 61 transitions. [2021-11-21 00:22:18,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:22:18,502 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 00:22:18,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:18,502 INFO L225 Difference]: With dead ends: 50 [2021-11-21 00:22:18,502 INFO L226 Difference]: Without dead ends: 50 [2021-11-21 00:22:18,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:22:18,503 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 74 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:18,504 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 17 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:18,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-21 00:22:18,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 33. [2021-11-21 00:22:18,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.4642857142857142) internal successors, (41), 32 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2021-11-21 00:22:18,507 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 11 [2021-11-21 00:22:18,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:18,507 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2021-11-21 00:22:18,507 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,507 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2021-11-21 00:22:18,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 00:22:18,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:18,508 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:18,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-21 00:22:18,508 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:18,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:18,509 INFO L85 PathProgramCache]: Analyzing trace with hash 1209062877, now seen corresponding path program 1 times [2021-11-21 00:22:18,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:18,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589035891] [2021-11-21 00:22:18,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:18,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:18,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:18,528 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:18,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:18,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589035891] [2021-11-21 00:22:18,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589035891] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:18,529 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:18,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:22:18,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013156838] [2021-11-21 00:22:18,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:18,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:22:18,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:18,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:22:18,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:18,531 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:18,545 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2021-11-21 00:22:18,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:22:18,546 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 00:22:18,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:18,547 INFO L225 Difference]: With dead ends: 35 [2021-11-21 00:22:18,547 INFO L226 Difference]: Without dead ends: 35 [2021-11-21 00:22:18,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:22:18,548 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:18,548 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:18,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-21 00:22:18,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-21 00:22:18,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 34 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2021-11-21 00:22:18,551 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 11 [2021-11-21 00:22:18,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:18,551 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2021-11-21 00:22:18,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,551 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2021-11-21 00:22:18,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 00:22:18,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:18,552 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:18,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-21 00:22:18,552 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:18,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:18,553 INFO L85 PathProgramCache]: Analyzing trace with hash -2035392994, now seen corresponding path program 1 times [2021-11-21 00:22:18,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:18,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040533741] [2021-11-21 00:22:18,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:18,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:18,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:18,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:18,707 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:18,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040533741] [2021-11-21 00:22:18,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040533741] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:18,707 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:18,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-21 00:22:18,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541745207] [2021-11-21 00:22:18,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:18,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 00:22:18,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:18,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 00:22:18,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:22:18,709 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:19,328 INFO L93 Difference]: Finished difference Result 81 states and 97 transitions. [2021-11-21 00:22:19,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:22:19,329 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-21 00:22:19,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:19,330 INFO L225 Difference]: With dead ends: 81 [2021-11-21 00:22:19,330 INFO L226 Difference]: Without dead ends: 81 [2021-11-21 00:22:19,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=163, Invalid=343, Unknown=0, NotChecked=0, Total=506 [2021-11-21 00:22:19,331 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 117 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:19,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 104 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:22:19,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-21 00:22:19,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 46. [2021-11-21 00:22:19,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.3902439024390243) internal successors, (57), 45 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2021-11-21 00:22:19,335 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 13 [2021-11-21 00:22:19,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:19,335 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2021-11-21 00:22:19,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,336 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2021-11-21 00:22:19,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 00:22:19,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:19,337 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:19,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-21 00:22:19,337 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:19,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:19,337 INFO L85 PathProgramCache]: Analyzing trace with hash -2026746548, now seen corresponding path program 1 times [2021-11-21 00:22:19,338 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:19,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458247666] [2021-11-21 00:22:19,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:19,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:19,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:19,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:19,368 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:19,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458247666] [2021-11-21 00:22:19,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458247666] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:19,369 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:19,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:22:19,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393284032] [2021-11-21 00:22:19,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:19,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:22:19,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:19,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:22:19,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:22:19,370 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:19,416 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2021-11-21 00:22:19,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:22:19,416 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-21 00:22:19,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:19,417 INFO L225 Difference]: With dead ends: 51 [2021-11-21 00:22:19,417 INFO L226 Difference]: Without dead ends: 48 [2021-11-21 00:22:19,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:22:19,418 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 8 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:19,418 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 31 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:19,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-21 00:22:19,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2021-11-21 00:22:19,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.3095238095238095) internal successors, (55), 46 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2021-11-21 00:22:19,421 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 13 [2021-11-21 00:22:19,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:19,421 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2021-11-21 00:22:19,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,422 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2021-11-21 00:22:19,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:22:19,423 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:19,423 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:19,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-21 00:22:19,423 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:19,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:19,424 INFO L85 PathProgramCache]: Analyzing trace with hash -1802581683, now seen corresponding path program 1 times [2021-11-21 00:22:19,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:19,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614471357] [2021-11-21 00:22:19,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:19,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:19,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:19,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:19,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:19,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614471357] [2021-11-21 00:22:19,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614471357] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:19,534 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:19,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:22:19,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984961546] [2021-11-21 00:22:19,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:19,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:22:19,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:19,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:22:19,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:22:19,536 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:19,753 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2021-11-21 00:22:19,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:22:19,753 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-21 00:22:19,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:19,754 INFO L225 Difference]: With dead ends: 43 [2021-11-21 00:22:19,754 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 00:22:19,754 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:22:19,755 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 13 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:19,755 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 77 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:19,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 00:22:19,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-11-21 00:22:19,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 35 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-11-21 00:22:19,757 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 15 [2021-11-21 00:22:19,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:19,757 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-11-21 00:22:19,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,757 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-11-21 00:22:19,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:22:19,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:19,758 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:19,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-21 00:22:19,758 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:19,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:19,759 INFO L85 PathProgramCache]: Analyzing trace with hash 204836708, now seen corresponding path program 1 times [2021-11-21 00:22:19,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:19,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133234783] [2021-11-21 00:22:19,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:19,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:19,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:19,836 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:22:19,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:19,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133234783] [2021-11-21 00:22:19,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133234783] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:19,836 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:19,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-21 00:22:19,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937415749] [2021-11-21 00:22:19,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:19,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:22:19,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:19,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:22:19,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:22:19,838 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:19,940 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2021-11-21 00:22:19,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 00:22:19,941 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-21 00:22:19,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:19,941 INFO L225 Difference]: With dead ends: 44 [2021-11-21 00:22:19,941 INFO L226 Difference]: Without dead ends: 38 [2021-11-21 00:22:19,942 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2021-11-21 00:22:19,942 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 36 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:19,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 74 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:19,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-21 00:22:19,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-11-21 00:22:19,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.34375) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-11-21 00:22:19,944 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 15 [2021-11-21 00:22:19,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:19,945 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-11-21 00:22:19,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:19,945 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-11-21 00:22:19,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 00:22:19,945 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:19,945 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:19,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-21 00:22:19,946 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:19,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:19,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1117547254, now seen corresponding path program 1 times [2021-11-21 00:22:19,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:19,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908101135] [2021-11-21 00:22:19,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:19,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:19,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:20,043 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:22:20,043 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:20,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908101135] [2021-11-21 00:22:20,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908101135] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:20,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1445692616] [2021-11-21 00:22:20,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:20,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:20,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:20,045 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:20,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:22:20,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:20,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 00:22:20,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:20,225 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:22:20,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:20,354 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 5 treesize of output 3 [2021-11-21 00:22:20,382 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:22:20,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1445692616] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:20,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2146605059] [2021-11-21 00:22:20,389 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:22:20,389 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:20,389 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:20,390 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:20,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:20,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:20,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:22:20,733 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 20 treesize of output 16 [2021-11-21 00:22:20,979 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:20,980 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 194 treesize of output 193 [2021-11-21 00:22:21,636 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 23 treesize of output 19 [2021-11-21 00:22:21,867 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 23 treesize of output 19 [2021-11-21 00:22:22,529 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:22:22,529 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 120 treesize of output 124 [2021-11-21 00:22:23,208 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 23 treesize of output 19 [2021-11-21 00:22:23,475 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 23 treesize of output 19 [2021-11-21 00:22:23,640 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 23 treesize of output 19 [2021-11-21 00:22:23,815 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 14 treesize of output 10 [2021-11-21 00:22:24,018 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:22:24,019 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 25 treesize of output 24 [2021-11-21 00:22:30,530 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:32,267 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:32,268 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:32,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2021-11-21 00:22:32,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236157985] [2021-11-21 00:22:32,270 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:32,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 00:22:32,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:32,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 00:22:32,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=865, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:22:32,272 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:32,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:32,483 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2021-11-21 00:22:32,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:22:32,484 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-21 00:22:32,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:32,484 INFO L225 Difference]: With dead ends: 54 [2021-11-21 00:22:32,485 INFO L226 Difference]: Without dead ends: 50 [2021-11-21 00:22:32,485 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=188, Invalid=1144, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:22:32,486 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 224 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:32,486 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [224 Valid, 45 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:32,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-21 00:22:32,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 33. [2021-11-21 00:22:32,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:32,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2021-11-21 00:22:32,488 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 17 [2021-11-21 00:22:32,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:32,489 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2021-11-21 00:22:32,489 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:32,489 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2021-11-21 00:22:32,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 00:22:32,491 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:32,491 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:32,528 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:32,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:32,706 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:32,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:32,706 INFO L85 PathProgramCache]: Analyzing trace with hash 221052965, now seen corresponding path program 1 times [2021-11-21 00:22:32,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:32,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856928063] [2021-11-21 00:22:32,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:32,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:32,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:32,812 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:22:32,812 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:32,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856928063] [2021-11-21 00:22:32,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856928063] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:32,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161397146] [2021-11-21 00:22:32,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:32,814 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:32,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:32,815 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:32,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:22:32,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:32,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 00:22:32,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:32,892 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:22:32,892 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:22:32,895 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 15 treesize of output 13 [2021-11-21 00:22:33,061 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:22:33,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:33,226 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:22:33,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161397146] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:33,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [970521659] [2021-11-21 00:22:33,229 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:22:33,229 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:33,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:33,230 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:33,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:33,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:33,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:22:33,474 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 23 treesize of output 19 [2021-11-21 00:22:33,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:33,707 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 200 treesize of output 192 [2021-11-21 00:22:34,251 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 23 treesize of output 19 [2021-11-21 00:22:34,439 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 23 treesize of output 19 [2021-11-21 00:22:35,157 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:22:35,157 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 117 treesize of output 121 [2021-11-21 00:22:35,774 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 23 treesize of output 19 [2021-11-21 00:22:35,969 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 23 treesize of output 19 [2021-11-21 00:22:36,134 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 14 treesize of output 10 [2021-11-21 00:22:36,269 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:22:36,270 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 25 treesize of output 24 [2021-11-21 00:22:45,701 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:47,743 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:47,743 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:47,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 15 [2021-11-21 00:22:47,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381108003] [2021-11-21 00:22:47,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:47,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 00:22:47,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:47,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 00:22:47,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=933, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:22:47,745 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 17 states, 16 states have (on average 3.125) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:47,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:47,989 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2021-11-21 00:22:47,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:22:47,992 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.125) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-21 00:22:47,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:47,992 INFO L225 Difference]: With dead ends: 62 [2021-11-21 00:22:47,992 INFO L226 Difference]: Without dead ends: 62 [2021-11-21 00:22:47,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=186, Invalid=1296, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:22:47,994 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 191 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:47,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 30 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:47,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-21 00:22:47,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 43. [2021-11-21 00:22:47,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 40 states have (on average 1.3) internal successors, (52), 42 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:47,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2021-11-21 00:22:47,997 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 19 [2021-11-21 00:22:47,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:47,997 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2021-11-21 00:22:47,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.125) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:47,998 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2021-11-21 00:22:47,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:22:47,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:47,999 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:48,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:48,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-21 00:22:48,214 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:22:48,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:48,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1734844397, now seen corresponding path program 1 times [2021-11-21 00:22:48,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:48,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192529109] [2021-11-21 00:22:48,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:48,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:48,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:48,322 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:22:48,323 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:48,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192529109] [2021-11-21 00:22:48,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1192529109] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:48,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259772632] [2021-11-21 00:22:48,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:48,324 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:48,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:48,325 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:48,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:22:48,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:48,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-21 00:22:48,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:48,410 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:22:48,412 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:22:48,414 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 15 treesize of output 13 [2021-11-21 00:22:48,587 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:22:48,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:48,757 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:22:48,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259772632] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:48,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [576513157] [2021-11-21 00:22:48,760 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:22:48,760 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:48,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:48,761 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:48,761 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:48,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:48,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:22:49,041 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 23 treesize of output 19 [2021-11-21 00:22:49,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:49,222 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 200 treesize of output 192 [2021-11-21 00:22:49,610 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 23 treesize of output 19 [2021-11-21 00:22:49,807 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 23 treesize of output 19 [2021-11-21 00:22:50,435 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:22:50,436 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 117 treesize of output 121 [2021-11-21 00:22:50,901 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 23 treesize of output 19 [2021-11-21 00:22:51,113 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 23 treesize of output 19 [2021-11-21 00:22:51,324 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 14 treesize of output 10 [2021-11-21 00:22:51,493 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:22:51,493 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 25 treesize of output 24 [2021-11-21 00:22:57,621 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:59,415 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:59,415 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:59,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 18 [2021-11-21 00:22:59,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691298911] [2021-11-21 00:22:59,416 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:59,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 00:22:59,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:59,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 00:22:59,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1004, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:22:59,417 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 20 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 19 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:59,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:59,790 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2021-11-21 00:22:59,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:22:59,791 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 19 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-21 00:22:59,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:59,791 INFO L225 Difference]: With dead ends: 58 [2021-11-21 00:22:59,791 INFO L226 Difference]: Without dead ends: 58 [2021-11-21 00:22:59,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=248, Invalid=1644, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 00:22:59,793 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 231 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:59,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [231 Valid, 36 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:59,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-21 00:22:59,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2021-11-21 00:22:59,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 45 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:59,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2021-11-21 00:22:59,795 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 20 [2021-11-21 00:22:59,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:59,796 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2021-11-21 00:22:59,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 19 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:59,796 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2021-11-21 00:22:59,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 00:22:59,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:59,797 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:59,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:00,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-21 00:23:00,009 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:23:00,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:00,009 INFO L85 PathProgramCache]: Analyzing trace with hash -738116091, now seen corresponding path program 2 times [2021-11-21 00:23:00,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:00,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154090795] [2021-11-21 00:23:00,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:00,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:00,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:00,194 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:00,194 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:00,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154090795] [2021-11-21 00:23:00,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154090795] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:00,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702029445] [2021-11-21 00:23:00,195 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:00,195 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:00,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:00,198 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:00,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:23:00,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:23:00,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:00,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-21 00:23:00,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:00,297 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 10 treesize of output 8 [2021-11-21 00:23:00,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:23:00,527 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-11-21 00:23:00,527 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 33 treesize of output 32 [2021-11-21 00:23:01,127 INFO L354 Elim1Store]: treesize reduction 60, result has 22.1 percent of original size [2021-11-21 00:23:01,127 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 66 treesize of output 50 [2021-11-21 00:23:01,168 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:01,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:03,120 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_substring_~pt~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse0 (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)))) (let ((.cse1 (select (select .cse0 |ULTIMATE.start_substring_~pt~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (or (not (= (select (select .cse0 |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) .cse1)) (= .cse1 0))))) is different from false [2021-11-21 00:23:03,133 INFO L354 Elim1Store]: treesize reduction 14, result has 6.7 percent of original size [2021-11-21 00:23:03,134 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 442 treesize of output 388 [2021-11-21 00:23:03,346 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:03,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702029445] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:03,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [820032724] [2021-11-21 00:23:03,348 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:23:03,349 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:03,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:03,349 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:03,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:03,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:03,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:03,599 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 20 treesize of output 16 [2021-11-21 00:23:03,798 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:23:03,798 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 194 treesize of output 193 [2021-11-21 00:23:04,556 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 23 treesize of output 19 [2021-11-21 00:23:04,705 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 23 treesize of output 19 [2021-11-21 00:23:05,448 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:23:05,449 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 117 treesize of output 121 [2021-11-21 00:23:05,902 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 23 treesize of output 19 [2021-11-21 00:23:06,035 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 23 treesize of output 19 [2021-11-21 00:23:06,202 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 14 treesize of output 10 [2021-11-21 00:23:06,394 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:23:06,395 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 25 treesize of output 24 [2021-11-21 00:23:12,871 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:15,002 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:15,002 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:15,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13] total 33 [2021-11-21 00:23:15,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398651226] [2021-11-21 00:23:15,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:15,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-21 00:23:15,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:15,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-21 00:23:15,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1989, Unknown=2, NotChecked=90, Total=2256 [2021-11-21 00:23:15,004 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand has 34 states, 34 states have (on average 1.8529411764705883) internal successors, (63), 33 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:20,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:20,316 INFO L93 Difference]: Finished difference Result 97 states and 111 transitions. [2021-11-21 00:23:20,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-21 00:23:20,317 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.8529411764705883) internal successors, (63), 33 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-21 00:23:20,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:20,318 INFO L225 Difference]: With dead ends: 97 [2021-11-21 00:23:20,318 INFO L226 Difference]: Without dead ends: 93 [2021-11-21 00:23:20,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 909 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=309, Invalid=3233, Unknown=2, NotChecked=116, Total=3660 [2021-11-21 00:23:20,321 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 54 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 125 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:20,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 94 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 157 Invalid, 0 Unknown, 125 Unchecked, 0.1s Time] [2021-11-21 00:23:20,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-21 00:23:20,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 73. [2021-11-21 00:23:20,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 70 states have (on average 1.2428571428571429) internal successors, (87), 72 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:20,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2021-11-21 00:23:20,325 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 22 [2021-11-21 00:23:20,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:20,325 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2021-11-21 00:23:20,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.8529411764705883) internal successors, (63), 33 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:20,326 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2021-11-21 00:23:20,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 00:23:20,327 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:20,327 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:20,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:20,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:20,528 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:23:20,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:20,528 INFO L85 PathProgramCache]: Analyzing trace with hash 1722857087, now seen corresponding path program 1 times [2021-11-21 00:23:20,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:20,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355909039] [2021-11-21 00:23:20,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:20,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:20,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:20,632 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:20,632 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:20,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355909039] [2021-11-21 00:23:20,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355909039] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:20,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632216861] [2021-11-21 00:23:20,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:20,633 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:20,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:20,634 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:20,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:23:20,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:20,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-21 00:23:20,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:20,713 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:23:20,714 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:23:20,719 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 15 treesize of output 13 [2021-11-21 00:23:20,916 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:20,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:21,148 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:21,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632216861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:21,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [768259612] [2021-11-21 00:23:21,150 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:23:21,150 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:21,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:21,151 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:21,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:21,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:21,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:21,458 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 23 treesize of output 19 [2021-11-21 00:23:21,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:21,639 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 200 treesize of output 192 [2021-11-21 00:23:22,135 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 23 treesize of output 19 [2021-11-21 00:23:22,365 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 23 treesize of output 19 [2021-11-21 00:23:22,984 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:23:22,985 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 117 treesize of output 121 [2021-11-21 00:23:23,349 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 23 treesize of output 19 [2021-11-21 00:23:23,530 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 23 treesize of output 19 [2021-11-21 00:23:23,708 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 14 treesize of output 10 [2021-11-21 00:23:23,914 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:23:23,914 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 25 treesize of output 24 [2021-11-21 00:23:34,159 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:36,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [768259612] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:23:36,265 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:36,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [7, 6, 6] total 33 [2021-11-21 00:23:36,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373685184] [2021-11-21 00:23:36,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:23:36,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 00:23:36,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:36,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 00:23:36,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1055, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 00:23:36,268 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:41,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:41,711 INFO L93 Difference]: Finished difference Result 82 states and 95 transitions. [2021-11-21 00:23:41,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 00:23:41,712 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-21 00:23:41,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:41,713 INFO L225 Difference]: With dead ends: 82 [2021-11-21 00:23:41,713 INFO L226 Difference]: Without dead ends: 82 [2021-11-21 00:23:41,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=314, Invalid=2038, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 00:23:41,714 INFO L933 BasicCegarLoop]: 0 mSDtfsCounter, 73 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:41,714 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 3 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:23:41,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-21 00:23:41,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 73. [2021-11-21 00:23:41,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 70 states have (on average 1.2285714285714286) internal successors, (86), 72 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:41,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 86 transitions. [2021-11-21 00:23:41,723 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 86 transitions. Word has length 24 [2021-11-21 00:23:41,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:41,723 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 86 transitions. [2021-11-21 00:23:41,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:41,724 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 86 transitions. [2021-11-21 00:23:41,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 00:23:41,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:41,725 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:41,749 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:41,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-21 00:23:41,933 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:23:41,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:41,934 INFO L85 PathProgramCache]: Analyzing trace with hash 1241317677, now seen corresponding path program 3 times [2021-11-21 00:23:41,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:41,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659149977] [2021-11-21 00:23:41,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:41,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:41,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:42,062 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:23:42,062 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:42,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659149977] [2021-11-21 00:23:42,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659149977] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:42,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165190913] [2021-11-21 00:23:42,062 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:23:42,062 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:42,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:42,063 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:42,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:23:42,126 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:23:42,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:42,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-21 00:23:42,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:42,145 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:23:42,145 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 00:23:42,349 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:23:42,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:42,655 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:23:42,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165190913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:42,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [989175713] [2021-11-21 00:23:42,657 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:23:42,657 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:42,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:42,658 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:42,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:42,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:42,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:42,903 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 23 treesize of output 19 [2021-11-21 00:23:43,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:43,061 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 200 treesize of output 192 [2021-11-21 00:23:43,498 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 23 treesize of output 19 [2021-11-21 00:23:43,677 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 23 treesize of output 19 [2021-11-21 00:23:44,365 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:23:44,365 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 120 treesize of output 124 [2021-11-21 00:23:44,745 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 23 treesize of output 19 [2021-11-21 00:23:44,939 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 23 treesize of output 19 [2021-11-21 00:23:45,057 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 14 treesize of output 10 [2021-11-21 00:23:45,157 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:23:45,158 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 25 treesize of output 24 [2021-11-21 00:23:51,696 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:53,479 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:53,479 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:53,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 25 [2021-11-21 00:23:53,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904470207] [2021-11-21 00:23:53,479 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:53,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 00:23:53,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:53,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 00:23:53,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1466, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 00:23:53,481 INFO L87 Difference]: Start difference. First operand 73 states and 86 transitions. Second operand has 27 states, 26 states have (on average 2.6538461538461537) internal successors, (69), 26 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:53,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:53,885 INFO L93 Difference]: Finished difference Result 140 states and 160 transitions. [2021-11-21 00:23:53,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:23:53,885 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.6538461538461537) internal successors, (69), 26 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-21 00:23:53,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:53,887 INFO L225 Difference]: With dead ends: 140 [2021-11-21 00:23:53,887 INFO L226 Difference]: Without dead ends: 140 [2021-11-21 00:23:53,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=308, Invalid=1948, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 00:23:53,889 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 221 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:53,890 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [221 Valid, 116 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 443 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:23:53,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-21 00:23:53,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 103. [2021-11-21 00:23:53,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 100 states have (on average 1.24) internal successors, (124), 102 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:53,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 124 transitions. [2021-11-21 00:23:53,905 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 124 transitions. Word has length 26 [2021-11-21 00:23:53,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:53,906 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 124 transitions. [2021-11-21 00:23:53,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.6538461538461537) internal successors, (69), 26 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:53,907 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 124 transitions. [2021-11-21 00:23:53,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 00:23:53,908 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:53,908 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:53,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:54,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-21 00:23:54,134 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:23:54,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:54,134 INFO L85 PathProgramCache]: Analyzing trace with hash -1667724320, now seen corresponding path program 2 times [2021-11-21 00:23:54,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:54,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259733664] [2021-11-21 00:23:54,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:54,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:54,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:54,355 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:54,355 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:54,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259733664] [2021-11-21 00:23:54,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259733664] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:54,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269925184] [2021-11-21 00:23:54,356 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:54,356 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:54,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:54,356 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:54,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:23:54,417 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:23:54,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:54,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-21 00:23:54,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:54,428 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 10 treesize of output 8 [2021-11-21 00:23:54,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 00:23:54,526 INFO L354 Elim1Store]: treesize reduction 31, result has 18.4 percent of original size [2021-11-21 00:23:54,526 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 50 treesize of output 49 [2021-11-21 00:23:54,745 INFO L354 Elim1Store]: treesize reduction 31, result has 8.8 percent of original size [2021-11-21 00:23:54,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 29 treesize of output 17 [2021-11-21 00:23:54,766 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:54,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:56,224 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 56 treesize of output 50 [2021-11-21 00:23:56,303 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:23:56,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269925184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:56,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1365288808] [2021-11-21 00:23:56,305 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:23:56,305 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:56,305 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:56,306 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:56,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:56,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:56,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:23:56,580 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 20 treesize of output 16 [2021-11-21 00:23:56,836 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:23:56,837 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 194 treesize of output 193 [2021-11-21 00:23:57,388 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 23 treesize of output 19 [2021-11-21 00:23:57,707 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 23 treesize of output 19 [2021-11-21 00:23:58,309 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:23:58,309 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 117 treesize of output 121 [2021-11-21 00:23:58,640 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 23 treesize of output 19 [2021-11-21 00:23:58,798 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 23 treesize of output 19 [2021-11-21 00:23:58,994 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 14 treesize of output 10 [2021-11-21 00:23:59,243 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:23:59,243 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 25 treesize of output 24 [2021-11-21 00:24:08,838 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:10,903 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:24:10,903 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:24:10,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 20 [2021-11-21 00:24:10,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128991608] [2021-11-21 00:24:10,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:10,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-21 00:24:10,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:24:10,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-21 00:24:10,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1203, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:24:10,905 INFO L87 Difference]: Start difference. First operand 103 states and 124 transitions. Second operand has 21 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 20 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:11,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:11,045 INFO L93 Difference]: Finished difference Result 121 states and 140 transitions. [2021-11-21 00:24:11,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:24:11,046 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 20 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-21 00:24:11,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:11,047 INFO L225 Difference]: With dead ends: 121 [2021-11-21 00:24:11,047 INFO L226 Difference]: Without dead ends: 85 [2021-11-21 00:24:11,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 53 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=160, Invalid=1400, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 00:24:11,048 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 19 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:11,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 74 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 82 Invalid, 0 Unknown, 29 Unchecked, 0.1s Time] [2021-11-21 00:24:11,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-21 00:24:11,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2021-11-21 00:24:11,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 81 states have (on average 1.2469135802469136) internal successors, (101), 83 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:11,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2021-11-21 00:24:11,051 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 28 [2021-11-21 00:24:11,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:11,051 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2021-11-21 00:24:11,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 20 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:11,052 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2021-11-21 00:24:11,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 00:24:11,052 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:11,052 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:24:11,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:11,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-21 00:24:11,265 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:24:11,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:11,265 INFO L85 PathProgramCache]: Analyzing trace with hash 427887228, now seen corresponding path program 2 times [2021-11-21 00:24:11,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:11,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010429130] [2021-11-21 00:24:11,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:11,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:11,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:11,397 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:24:11,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:11,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010429130] [2021-11-21 00:24:11,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010429130] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:11,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695284112] [2021-11-21 00:24:11,398 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:24:11,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:11,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:11,399 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:11,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:24:11,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:24:11,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:11,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-21 00:24:11,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:11,673 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:24:11,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:11,839 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 7 treesize of output 5 [2021-11-21 00:24:11,867 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:24:11,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [695284112] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:11,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [44925582] [2021-11-21 00:24:11,869 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:24:11,869 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:24:11,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:24:11,869 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:24:11,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:24:11,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:24:11,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:24:12,048 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 20 treesize of output 16 [2021-11-21 00:24:12,277 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:24:12,277 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 194 treesize of output 193 [2021-11-21 00:24:12,845 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 23 treesize of output 19 [2021-11-21 00:24:13,011 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 23 treesize of output 19 [2021-11-21 00:24:13,597 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:24:13,598 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 117 treesize of output 121 [2021-11-21 00:24:13,984 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 23 treesize of output 19 [2021-11-21 00:24:14,205 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 23 treesize of output 19 [2021-11-21 00:24:14,348 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 14 treesize of output 10 [2021-11-21 00:24:14,553 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:24:14,553 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 25 treesize of output 24 [2021-11-21 00:24:20,837 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:22,649 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:24:22,649 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:24:22,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 23 [2021-11-21 00:24:22,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856318514] [2021-11-21 00:24:22,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:22,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:24:22,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:24:22,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:24:22,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1326, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:24:22,651 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 25 states, 24 states have (on average 3.0) internal successors, (72), 24 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:23,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:23,110 INFO L93 Difference]: Finished difference Result 103 states and 119 transitions. [2021-11-21 00:24:23,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 00:24:23,110 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.0) internal successors, (72), 24 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-21 00:24:23,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:23,111 INFO L225 Difference]: With dead ends: 103 [2021-11-21 00:24:23,111 INFO L226 Difference]: Without dead ends: 103 [2021-11-21 00:24:23,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=352, Invalid=2098, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 00:24:23,112 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 345 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:23,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [345 Valid, 58 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:24:23,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-21 00:24:23,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 87. [2021-11-21 00:24:23,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 84 states have (on average 1.2380952380952381) internal successors, (104), 86 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:23,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 104 transitions. [2021-11-21 00:24:23,116 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 104 transitions. Word has length 29 [2021-11-21 00:24:23,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:23,116 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 104 transitions. [2021-11-21 00:24:23,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.0) internal successors, (72), 24 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:23,117 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 104 transitions. [2021-11-21 00:24:23,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-21 00:24:23,117 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:23,117 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:24:23,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:23,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-21 00:24:23,322 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:24:23,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:23,322 INFO L85 PathProgramCache]: Analyzing trace with hash 294381018, now seen corresponding path program 3 times [2021-11-21 00:24:23,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:23,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987397420] [2021-11-21 00:24:23,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:23,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:23,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:23,415 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:24:23,416 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:23,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987397420] [2021-11-21 00:24:23,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987397420] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:23,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791787791] [2021-11-21 00:24:23,416 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:24:23,417 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:23,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:23,418 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:23,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:24:23,507 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:24:23,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:23,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-21 00:24:23,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:23,534 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:24:23,535 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 00:24:23,753 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 15 treesize of output 11 [2021-11-21 00:24:23,935 INFO L354 Elim1Store]: treesize reduction 18, result has 51.4 percent of original size [2021-11-21 00:24:23,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 50 treesize of output 44 [2021-11-21 00:24:24,147 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:24:24,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:24,436 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:24:24,437 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 54 treesize of output 56 [2021-11-21 00:24:24,452 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 13 treesize of output 11 [2021-11-21 00:24:24,471 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:24:24,471 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 71 treesize of output 71 [2021-11-21 00:24:24,704 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:24:24,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1791787791] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:24,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786901051] [2021-11-21 00:24:24,706 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:24:24,706 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:24:24,707 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:24:24,707 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:24:24,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:24:24,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:24:24,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:24:24,969 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 23 treesize of output 19 [2021-11-21 00:24:25,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:24:25,144 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 200 treesize of output 192 [2021-11-21 00:24:25,645 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 23 treesize of output 19 [2021-11-21 00:24:25,852 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 23 treesize of output 19 [2021-11-21 00:24:26,408 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:24:26,409 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 120 treesize of output 124 [2021-11-21 00:24:26,780 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 23 treesize of output 19 [2021-11-21 00:24:27,035 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 23 treesize of output 19 [2021-11-21 00:24:27,171 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 14 treesize of output 10 [2021-11-21 00:24:27,283 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:24:27,283 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 25 treesize of output 24 [2021-11-21 00:24:37,190 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:39,667 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:24:39,667 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:24:39,667 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 11] total 27 [2021-11-21 00:24:39,667 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522219647] [2021-11-21 00:24:39,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:39,668 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 00:24:39,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:24:39,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 00:24:39,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1807, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 00:24:39,669 INFO L87 Difference]: Start difference. First operand 87 states and 104 transitions. Second operand has 29 states, 28 states have (on average 3.1785714285714284) internal successors, (89), 28 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:40,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:40,400 INFO L93 Difference]: Finished difference Result 161 states and 192 transitions. [2021-11-21 00:24:40,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:24:40,400 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.1785714285714284) internal successors, (89), 28 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-21 00:24:40,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:40,401 INFO L225 Difference]: With dead ends: 161 [2021-11-21 00:24:40,401 INFO L226 Difference]: Without dead ends: 161 [2021-11-21 00:24:40,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=303, Invalid=2559, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 00:24:40,403 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 183 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:40,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 124 Invalid, 647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 582 Invalid, 0 Unknown, 47 Unchecked, 0.3s Time] [2021-11-21 00:24:40,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-21 00:24:40,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 122. [2021-11-21 00:24:40,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 119 states have (on average 1.2521008403361344) internal successors, (149), 121 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:40,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 149 transitions. [2021-11-21 00:24:40,408 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 149 transitions. Word has length 30 [2021-11-21 00:24:40,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:40,409 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 149 transitions. [2021-11-21 00:24:40,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.1785714285714284) internal successors, (89), 28 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:40,409 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 149 transitions. [2021-11-21 00:24:40,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-21 00:24:40,410 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:40,410 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:24:40,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:40,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-21 00:24:40,626 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:24:40,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:40,626 INFO L85 PathProgramCache]: Analyzing trace with hash 538325246, now seen corresponding path program 1 times [2021-11-21 00:24:40,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:40,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039050164] [2021-11-21 00:24:40,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:40,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:40,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:40,762 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:24:40,763 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:40,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039050164] [2021-11-21 00:24:40,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039050164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:40,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119192973] [2021-11-21 00:24:40,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:40,764 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:40,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:40,765 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:40,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:24:40,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:40,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-21 00:24:40,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:40,867 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:24:40,867 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:24:40,870 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 15 treesize of output 13 [2021-11-21 00:24:41,128 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:24:41,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:41,459 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:24:41,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119192973] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:41,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1661141554] [2021-11-21 00:24:41,461 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:24:41,461 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:24:41,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:24:41,461 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:24:41,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:24:41,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:24:41,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:24:41,682 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 20 treesize of output 16 [2021-11-21 00:24:41,873 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:24:41,873 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 194 treesize of output 193 [2021-11-21 00:24:42,510 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 23 treesize of output 19 [2021-11-21 00:24:42,734 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 23 treesize of output 19 [2021-11-21 00:24:43,438 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:24:43,438 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 117 treesize of output 121 [2021-11-21 00:24:43,716 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 23 treesize of output 19 [2021-11-21 00:24:43,911 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 23 treesize of output 19 [2021-11-21 00:24:44,114 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 14 treesize of output 10 [2021-11-21 00:24:44,237 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:24:44,238 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 25 treesize of output 24 [2021-11-21 00:25:12,100 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:14,253 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:25:14,253 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:14,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 23 [2021-11-21 00:25:14,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456456661] [2021-11-21 00:25:14,253 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:14,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:25:14,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:14,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:25:14,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1489, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 00:25:14,255 INFO L87 Difference]: Start difference. First operand 122 states and 149 transitions. Second operand has 25 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 24 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:14,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:14,945 INFO L93 Difference]: Finished difference Result 150 states and 173 transitions. [2021-11-21 00:25:14,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:25:14,945 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 24 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-21 00:25:14,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:14,946 INFO L225 Difference]: With dead ends: 150 [2021-11-21 00:25:14,946 INFO L226 Difference]: Without dead ends: 150 [2021-11-21 00:25:14,947 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=390, Invalid=2580, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 00:25:14,948 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 588 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 588 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:14,948 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [588 Valid, 49 Invalid, 399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:25:14,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-21 00:25:14,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 125. [2021-11-21 00:25:14,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 122 states have (on average 1.2377049180327868) internal successors, (151), 124 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:14,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 151 transitions. [2021-11-21 00:25:14,952 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 151 transitions. Word has length 31 [2021-11-21 00:25:14,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:14,953 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 151 transitions. [2021-11-21 00:25:14,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 24 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:14,953 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 151 transitions. [2021-11-21 00:25:14,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-21 00:25:14,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:14,954 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:25:14,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:15,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:15,166 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:25:15,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:15,166 INFO L85 PathProgramCache]: Analyzing trace with hash -1117195730, now seen corresponding path program 4 times [2021-11-21 00:25:15,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:15,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239159300] [2021-11-21 00:25:15,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:15,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:15,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:15,704 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 9 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:15,705 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:15,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239159300] [2021-11-21 00:25:15,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239159300] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:15,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668717223] [2021-11-21 00:25:15,705 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:25:15,705 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:15,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:15,706 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:15,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:25:15,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:15,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-21 00:25:15,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:15,879 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 21 treesize of output 17 [2021-11-21 00:25:16,051 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:25:16,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:16,151 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 15 treesize of output 13 [2021-11-21 00:25:16,153 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 26 treesize of output 22 [2021-11-21 00:25:16,285 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:25:16,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668717223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:16,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1539302499] [2021-11-21 00:25:16,287 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:25:16,287 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:16,287 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:16,288 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:16,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:16,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:25:16,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:25:16,494 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 23 treesize of output 19 [2021-11-21 00:25:16,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:25:16,674 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 200 treesize of output 192 [2021-11-21 00:25:17,348 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 23 treesize of output 19 [2021-11-21 00:25:17,543 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 23 treesize of output 19 [2021-11-21 00:25:18,139 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:25:18,139 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 117 treesize of output 121 [2021-11-21 00:25:18,486 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 23 treesize of output 19 [2021-11-21 00:25:18,669 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 23 treesize of output 19 [2021-11-21 00:25:18,853 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 14 treesize of output 10 [2021-11-21 00:25:19,093 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:25:19,093 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 25 treesize of output 24 [2021-11-21 00:25:25,757 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:27,672 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:25:27,672 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:27,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 12, 12] total 28 [2021-11-21 00:25:27,672 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580737899] [2021-11-21 00:25:27,672 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:27,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 00:25:27,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:27,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 00:25:27,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1582, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 00:25:27,674 INFO L87 Difference]: Start difference. First operand 125 states and 151 transitions. Second operand has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:28,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:28,931 INFO L93 Difference]: Finished difference Result 389 states and 443 transitions. [2021-11-21 00:25:28,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-21 00:25:28,931 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-21 00:25:28,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:28,933 INFO L225 Difference]: With dead ends: 389 [2021-11-21 00:25:28,933 INFO L226 Difference]: Without dead ends: 377 [2021-11-21 00:25:28,935 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 64 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=368, Invalid=3292, Unknown=0, NotChecked=0, Total=3660 [2021-11-21 00:25:28,935 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 304 mSDsluCounter, 325 mSDsCounter, 0 mSdLazyCounter, 543 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 697 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 123 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:28,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [304 Valid, 318 Invalid, 697 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 543 Invalid, 0 Unknown, 123 Unchecked, 0.3s Time] [2021-11-21 00:25:28,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-11-21 00:25:28,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 224. [2021-11-21 00:25:28,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 221 states have (on average 1.1945701357466063) internal successors, (264), 223 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:28,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 264 transitions. [2021-11-21 00:25:28,943 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 264 transitions. Word has length 31 [2021-11-21 00:25:28,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:28,943 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 264 transitions. [2021-11-21 00:25:28,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:28,943 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 264 transitions. [2021-11-21 00:25:28,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 00:25:28,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:28,944 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:25:28,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:29,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:29,162 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:25:29,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:29,162 INFO L85 PathProgramCache]: Analyzing trace with hash 1934524464, now seen corresponding path program 1 times [2021-11-21 00:25:29,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:29,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786096852] [2021-11-21 00:25:29,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:29,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:29,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:29,557 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:29,557 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:29,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786096852] [2021-11-21 00:25:29,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786096852] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:29,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523216339] [2021-11-21 00:25:29,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:29,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:29,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:29,559 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:29,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 00:25:29,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:29,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-21 00:25:29,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:29,716 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 21 treesize of output 17 [2021-11-21 00:25:30,111 INFO L354 Elim1Store]: treesize reduction 32, result has 8.6 percent of original size [2021-11-21 00:25:30,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 48 treesize of output 30 [2021-11-21 00:25:30,119 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:25:30,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:30,314 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 29 treesize of output 25 [2021-11-21 00:25:30,318 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-21 00:25:30,318 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 45 treesize of output 39 [2021-11-21 00:25:30,461 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 13 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:25:30,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523216339] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:30,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1329230877] [2021-11-21 00:25:30,463 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:25:30,463 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:30,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:30,463 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:30,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:30,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:25:30,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:25:30,719 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 23 treesize of output 19 [2021-11-21 00:25:30,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:25:30,889 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 200 treesize of output 192 [2021-11-21 00:25:31,393 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 23 treesize of output 19 [2021-11-21 00:25:31,554 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 23 treesize of output 19 [2021-11-21 00:25:32,172 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:25:32,172 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 117 treesize of output 121 [2021-11-21 00:25:32,684 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 23 treesize of output 19 [2021-11-21 00:25:32,946 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 23 treesize of output 19 [2021-11-21 00:25:33,086 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 14 treesize of output 10 [2021-11-21 00:25:33,263 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:25:33,263 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 25 treesize of output 24 [2021-11-21 00:26:01,260 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:26:03,836 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:26:03,836 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:26:03,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 13] total 39 [2021-11-21 00:26:03,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267779653] [2021-11-21 00:26:03,836 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:03,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-21 00:26:03,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:26:03,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-21 00:26:03,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=2766, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 00:26:03,839 INFO L87 Difference]: Start difference. First operand 224 states and 264 transitions. Second operand has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:05,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:05,247 INFO L93 Difference]: Finished difference Result 240 states and 273 transitions. [2021-11-21 00:26:05,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-21 00:26:05,248 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-21 00:26:05,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:05,250 INFO L225 Difference]: With dead ends: 240 [2021-11-21 00:26:05,250 INFO L226 Difference]: Without dead ends: 235 [2021-11-21 00:26:05,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1483 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=488, Invalid=5832, Unknown=0, NotChecked=0, Total=6320 [2021-11-21 00:26:05,253 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 58 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 196 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:05,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 140 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 280 Invalid, 0 Unknown, 196 Unchecked, 0.2s Time] [2021-11-21 00:26:05,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-11-21 00:26:05,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 209. [2021-11-21 00:26:05,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 206 states have (on average 1.1699029126213591) internal successors, (241), 208 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:05,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 241 transitions. [2021-11-21 00:26:05,261 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 241 transitions. Word has length 33 [2021-11-21 00:26:05,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:05,261 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 241 transitions. [2021-11-21 00:26:05,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:05,262 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 241 transitions. [2021-11-21 00:26:05,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 00:26:05,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:05,263 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:26:05,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:05,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-21 00:26:05,478 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:26:05,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:05,478 INFO L85 PathProgramCache]: Analyzing trace with hash 1039330496, now seen corresponding path program 5 times [2021-11-21 00:26:05,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:26:05,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837442490] [2021-11-21 00:26:05,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:05,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:26:05,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:05,661 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 1 proven. 26 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:26:05,661 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:26:05,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837442490] [2021-11-21 00:26:05,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837442490] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:26:05,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272366120] [2021-11-21 00:26:05,662 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:26:05,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:05,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:05,677 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:05,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 00:26:05,789 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:26:05,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:05,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-21 00:26:05,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:05,973 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:26:05,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:06,155 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 7 treesize of output 5 [2021-11-21 00:26:06,186 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:26:06,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272366120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:06,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [394845470] [2021-11-21 00:26:06,188 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:26:06,188 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:26:06,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:26:06,189 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:26:06,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:26:06,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:26:06,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:26:06,449 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 20 treesize of output 16 [2021-11-21 00:26:06,608 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:26:06,608 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 194 treesize of output 193 [2021-11-21 00:26:07,281 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 23 treesize of output 19 [2021-11-21 00:26:07,469 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 23 treesize of output 19 [2021-11-21 00:26:08,182 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:26:08,182 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 120 treesize of output 124 [2021-11-21 00:26:08,603 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 23 treesize of output 19 [2021-11-21 00:26:08,825 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 23 treesize of output 19 [2021-11-21 00:26:09,047 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 14 treesize of output 10 [2021-11-21 00:26:09,256 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:26:09,256 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 25 treesize of output 24 [2021-11-21 00:26:16,521 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:26:18,344 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:26:18,344 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:26:18,344 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 27 [2021-11-21 00:26:18,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885898006] [2021-11-21 00:26:18,344 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:18,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 00:26:18,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:26:18,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 00:26:18,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1538, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 00:26:18,346 INFO L87 Difference]: Start difference. First operand 209 states and 241 transitions. Second operand has 28 states, 27 states have (on average 3.0) internal successors, (81), 28 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:18,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:18,779 INFO L93 Difference]: Finished difference Result 331 states and 379 transitions. [2021-11-21 00:26:18,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 00:26:18,780 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 3.0) internal successors, (81), 28 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-21 00:26:18,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:18,781 INFO L225 Difference]: With dead ends: 331 [2021-11-21 00:26:18,782 INFO L226 Difference]: Without dead ends: 331 [2021-11-21 00:26:18,783 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 763 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=344, Invalid=2206, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 00:26:18,784 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 262 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 531 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:18,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [262 Valid, 156 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 531 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:26:18,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-11-21 00:26:18,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 264. [2021-11-21 00:26:18,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 261 states have (on average 1.1992337164750957) internal successors, (313), 263 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:18,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 313 transitions. [2021-11-21 00:26:18,793 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 313 transitions. Word has length 33 [2021-11-21 00:26:18,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:18,793 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 313 transitions. [2021-11-21 00:26:18,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 3.0) internal successors, (81), 28 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:18,794 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 313 transitions. [2021-11-21 00:26:18,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-21 00:26:18,794 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:18,794 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:26:18,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:19,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-21 00:26:19,008 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:26:19,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:19,009 INFO L85 PathProgramCache]: Analyzing trace with hash 276959753, now seen corresponding path program 3 times [2021-11-21 00:26:19,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:26:19,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037750058] [2021-11-21 00:26:19,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:19,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:26:19,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:19,430 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 12 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:19,430 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:26:19,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037750058] [2021-11-21 00:26:19,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037750058] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:26:19,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103084992] [2021-11-21 00:26:19,431 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:26:19,431 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:19,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:19,432 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:19,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 00:26:19,502 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:26:19,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:19,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-21 00:26:19,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:19,524 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:26:19,524 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 00:26:19,730 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 23 treesize of output 19 [2021-11-21 00:26:20,095 INFO L354 Elim1Store]: treesize reduction 10, result has 23.1 percent of original size [2021-11-21 00:26:20,095 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 54 treesize of output 40 [2021-11-21 00:26:20,112 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:26:20,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:20,482 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 24 [2021-11-21 00:26:20,498 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 32 treesize of output 30 [2021-11-21 00:26:21,033 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:26:21,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103084992] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:21,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [17448264] [2021-11-21 00:26:21,035 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:26:21,035 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:26:21,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:26:21,035 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:26:21,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:26:21,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:26:21,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:26:21,356 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 20 treesize of output 16 [2021-11-21 00:26:21,571 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:26:21,571 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 194 treesize of output 193 [2021-11-21 00:26:22,184 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 23 treesize of output 19 [2021-11-21 00:26:22,411 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 23 treesize of output 19 [2021-11-21 00:26:23,113 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:26:23,113 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 117 treesize of output 121 [2021-11-21 00:26:23,574 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 23 treesize of output 19 [2021-11-21 00:26:23,775 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 23 treesize of output 19 [2021-11-21 00:26:23,982 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 14 treesize of output 10 [2021-11-21 00:26:24,062 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:26:24,063 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 25 treesize of output 24 [2021-11-21 00:26:31,911 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:26:34,085 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:26:34,085 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:26:34,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 13] total 40 [2021-11-21 00:26:34,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422620957] [2021-11-21 00:26:34,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:34,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 00:26:34,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:26:34,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 00:26:34,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=2765, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 00:26:34,087 INFO L87 Difference]: Start difference. First operand 264 states and 313 transitions. Second operand has 41 states, 41 states have (on average 2.4146341463414633) internal successors, (99), 40 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:35,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:35,778 INFO L93 Difference]: Finished difference Result 350 states and 408 transitions. [2021-11-21 00:26:35,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-21 00:26:35,778 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.4146341463414633) internal successors, (99), 40 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-21 00:26:35,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:35,780 INFO L225 Difference]: With dead ends: 350 [2021-11-21 00:26:35,780 INFO L226 Difference]: Without dead ends: 348 [2021-11-21 00:26:35,782 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2014 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=759, Invalid=7431, Unknown=0, NotChecked=0, Total=8190 [2021-11-21 00:26:35,782 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 102 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 229 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:35,783 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 187 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 398 Invalid, 0 Unknown, 229 Unchecked, 0.2s Time] [2021-11-21 00:26:35,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-11-21 00:26:35,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 287. [2021-11-21 00:26:35,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 284 states have (on average 1.1971830985915493) internal successors, (340), 286 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:35,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 340 transitions. [2021-11-21 00:26:35,791 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 340 transitions. Word has length 36 [2021-11-21 00:26:35,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:35,791 INFO L470 AbstractCegarLoop]: Abstraction has 287 states and 340 transitions. [2021-11-21 00:26:35,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.4146341463414633) internal successors, (99), 40 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:35,791 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 340 transitions. [2021-11-21 00:26:35,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-21 00:26:35,792 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:35,792 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:26:35,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:36,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:36,006 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:26:36,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:36,006 INFO L85 PathProgramCache]: Analyzing trace with hash 202916299, now seen corresponding path program 4 times [2021-11-21 00:26:36,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:26:36,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795031227] [2021-11-21 00:26:36,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:36,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:26:36,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:36,330 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 17 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:36,330 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:26:36,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795031227] [2021-11-21 00:26:36,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795031227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:26:36,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250716299] [2021-11-21 00:26:36,330 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:26:36,331 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:36,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:36,331 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:36,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 00:26:36,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:36,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-21 00:26:36,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:36,407 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:26:36,407 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 00:26:36,631 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 21 treesize of output 17 [2021-11-21 00:26:36,686 INFO L354 Elim1Store]: treesize reduction 41, result has 18.0 percent of original size [2021-11-21 00:26:36,686 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 37 treesize of output 36 [2021-11-21 00:26:37,162 INFO L354 Elim1Store]: treesize reduction 44, result has 6.4 percent of original size [2021-11-21 00:26:37,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 40 treesize of output 24 [2021-11-21 00:26:37,205 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 17 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:37,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:37,478 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 63 treesize of output 57 [2021-11-21 00:26:37,837 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:37,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250716299] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:37,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [936501790] [2021-11-21 00:26:37,838 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:26:37,838 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:26:37,856 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:26:37,857 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:26:37,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:26:37,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:26:37,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:26:38,067 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 23 treesize of output 19 [2021-11-21 00:26:38,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:26:38,270 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 200 treesize of output 192 [2021-11-21 00:26:38,728 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 23 treesize of output 19 [2021-11-21 00:26:38,890 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 23 treesize of output 19 [2021-11-21 00:26:39,559 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:26:39,560 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 120 treesize of output 124 [2021-11-21 00:26:39,912 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 23 treesize of output 19 [2021-11-21 00:26:40,095 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 23 treesize of output 19 [2021-11-21 00:26:40,254 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 14 treesize of output 10 [2021-11-21 00:26:40,508 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:26:40,508 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 25 treesize of output 24 [2021-11-21 00:26:51,058 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:26:53,678 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:26:53,678 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:26:53,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14] total 39 [2021-11-21 00:26:53,678 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348261242] [2021-11-21 00:26:53,678 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:53,678 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-21 00:26:53,678 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:26:53,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-21 00:26:53,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=2859, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 00:26:53,679 INFO L87 Difference]: Start difference. First operand 287 states and 340 transitions. Second operand has 40 states, 40 states have (on average 2.625) internal successors, (105), 39 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:58,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:58,969 INFO L93 Difference]: Finished difference Result 303 states and 351 transitions. [2021-11-21 00:26:58,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 00:26:58,970 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.625) internal successors, (105), 39 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-21 00:26:58,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:58,971 INFO L225 Difference]: With dead ends: 303 [2021-11-21 00:26:58,971 INFO L226 Difference]: Without dead ends: 245 [2021-11-21 00:26:58,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1068 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=422, Invalid=4406, Unknown=2, NotChecked=0, Total=4830 [2021-11-21 00:26:58,972 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 65 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:58,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 180 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 191 Invalid, 0 Unknown, 126 Unchecked, 0.1s Time] [2021-11-21 00:26:58,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-11-21 00:26:58,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 242. [2021-11-21 00:26:58,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 239 states have (on average 1.205020920502092) internal successors, (288), 241 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:58,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 288 transitions. [2021-11-21 00:26:58,977 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 288 transitions. Word has length 39 [2021-11-21 00:26:58,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:58,978 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 288 transitions. [2021-11-21 00:26:58,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.625) internal successors, (105), 39 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:58,978 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 288 transitions. [2021-11-21 00:26:58,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 00:26:58,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:58,979 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:26:58,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:59,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:59,179 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:26:59,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:59,180 INFO L85 PathProgramCache]: Analyzing trace with hash 94811765, now seen corresponding path program 2 times [2021-11-21 00:26:59,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:26:59,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786072760] [2021-11-21 00:26:59,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:59,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:26:59,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:59,571 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:59,571 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:26:59,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786072760] [2021-11-21 00:26:59,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786072760] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:26:59,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034398066] [2021-11-21 00:26:59,571 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:26:59,571 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:59,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:59,572 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:59,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 00:26:59,637 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:26:59,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:59,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-21 00:26:59,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:59,660 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 10 treesize of output 8 [2021-11-21 00:26:59,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:26:59,885 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:26:59,885 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 35 treesize of output 34 [2021-11-21 00:27:02,590 INFO L354 Elim1Store]: treesize reduction 61, result has 29.9 percent of original size [2021-11-21 00:27:02,590 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 68 treesize of output 59 [2021-11-21 00:27:02,602 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 21 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:27:02,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:27:03,632 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2)) 0)) is different from false [2021-11-21 00:27:03,637 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 56 treesize of output 50 [2021-11-21 00:27:03,824 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 21 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:27:03,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034398066] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:27:03,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1412881147] [2021-11-21 00:27:03,826 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:27:03,826 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:27:03,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:27:03,826 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:27:03,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:27:03,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:27:03,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:27:04,032 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 23 treesize of output 19 [2021-11-21 00:27:04,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:27:04,222 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 200 treesize of output 192 [2021-11-21 00:27:04,684 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 23 treesize of output 19 [2021-11-21 00:27:04,913 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 23 treesize of output 19 [2021-11-21 00:27:05,488 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:27:05,489 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 120 treesize of output 124 [2021-11-21 00:27:05,841 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 23 treesize of output 19 [2021-11-21 00:27:06,086 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 23 treesize of output 19 [2021-11-21 00:27:06,252 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 14 treesize of output 10 [2021-11-21 00:27:06,443 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:27:06,443 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 25 treesize of output 24 [2021-11-21 00:27:33,271 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:27:35,815 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:27:35,815 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:27:35,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 15] total 38 [2021-11-21 00:27:35,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955149414] [2021-11-21 00:27:35,816 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:27:35,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-21 00:27:35,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:27:35,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-21 00:27:35,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=2656, Unknown=1, NotChecked=104, Total=2970 [2021-11-21 00:27:35,817 INFO L87 Difference]: Start difference. First operand 242 states and 288 transitions. Second operand has 39 states, 39 states have (on average 2.3333333333333335) internal successors, (91), 38 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:37,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:27:37,052 INFO L93 Difference]: Finished difference Result 278 states and 327 transitions. [2021-11-21 00:27:37,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 00:27:37,053 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.3333333333333335) internal successors, (91), 38 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-21 00:27:37,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:27:37,055 INFO L225 Difference]: With dead ends: 278 [2021-11-21 00:27:37,055 INFO L226 Difference]: Without dead ends: 278 [2021-11-21 00:27:37,055 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 900 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=311, Invalid=3724, Unknown=1, NotChecked=124, Total=4160 [2021-11-21 00:27:37,056 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 26 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 430 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 430 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 233 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:27:37,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 241 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 430 Invalid, 0 Unknown, 233 Unchecked, 0.2s Time] [2021-11-21 00:27:37,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2021-11-21 00:27:37,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 275. [2021-11-21 00:27:37,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 272 states have (on average 1.1911764705882353) internal successors, (324), 274 states have internal predecessors, (324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:37,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 324 transitions. [2021-11-21 00:27:37,064 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 324 transitions. Word has length 40 [2021-11-21 00:27:37,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:27:37,064 INFO L470 AbstractCegarLoop]: Abstraction has 275 states and 324 transitions. [2021-11-21 00:27:37,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.3333333333333335) internal successors, (91), 38 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:37,065 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 324 transitions. [2021-11-21 00:27:37,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 00:27:37,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:27:37,066 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:27:37,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-21 00:27:37,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-21 00:27:37,282 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:27:37,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:27:37,282 INFO L85 PathProgramCache]: Analyzing trace with hash 485919793, now seen corresponding path program 4 times [2021-11-21 00:27:37,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:27:37,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625618509] [2021-11-21 00:27:37,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:27:37,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:27:37,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:37,441 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:27:37,441 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:27:37,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625618509] [2021-11-21 00:27:37,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625618509] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:27:37,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [974770185] [2021-11-21 00:27:37,441 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:27:37,442 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:27:37,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:27:37,442 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:27:37,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 00:27:37,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:37,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 00:27:37,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:27:37,529 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:27:37,529 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:27:37,532 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 15 treesize of output 13 [2021-11-21 00:27:37,847 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:27:37,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:27:38,236 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 9 proven. 27 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:27:38,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [974770185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:27:38,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [282564814] [2021-11-21 00:27:38,237 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:27:38,238 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:27:38,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:27:38,238 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:27:38,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:27:38,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:27:38,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:27:38,457 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 23 treesize of output 19 [2021-11-21 00:27:38,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:27:38,621 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 200 treesize of output 192 [2021-11-21 00:27:39,015 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 23 treesize of output 19 [2021-11-21 00:27:39,188 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 23 treesize of output 19 [2021-11-21 00:27:39,943 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:27:39,943 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 120 treesize of output 124 [2021-11-21 00:27:40,410 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 23 treesize of output 19 [2021-11-21 00:27:40,559 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 23 treesize of output 19 [2021-11-21 00:27:40,714 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 14 treesize of output 10 [2021-11-21 00:27:40,891 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:27:40,891 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 25 treesize of output 24 [2021-11-21 00:27:47,763 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:27:49,804 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:27:49,805 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:27:49,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 29 [2021-11-21 00:27:49,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384501719] [2021-11-21 00:27:49,805 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:27:49,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 00:27:49,806 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:27:49,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 00:27:49,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1810, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 00:27:49,807 INFO L87 Difference]: Start difference. First operand 275 states and 324 transitions. Second operand has 31 states, 30 states have (on average 3.4) internal successors, (102), 30 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:50,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:27:50,614 INFO L93 Difference]: Finished difference Result 328 states and 382 transitions. [2021-11-21 00:27:50,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 00:27:50,622 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.4) internal successors, (102), 30 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-21 00:27:50,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:27:50,624 INFO L225 Difference]: With dead ends: 328 [2021-11-21 00:27:50,624 INFO L226 Difference]: Without dead ends: 328 [2021-11-21 00:27:50,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 733 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=499, Invalid=3161, Unknown=0, NotChecked=0, Total=3660 [2021-11-21 00:27:50,626 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 326 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 703 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 703 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:27:50,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [326 Valid, 148 Invalid, 750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 703 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:27:50,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2021-11-21 00:27:50,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 278. [2021-11-21 00:27:50,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 275 states have (on average 1.1890909090909092) internal successors, (327), 277 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:50,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 327 transitions. [2021-11-21 00:27:50,635 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 327 transitions. Word has length 40 [2021-11-21 00:27:50,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:27:50,635 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 327 transitions. [2021-11-21 00:27:50,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.4) internal successors, (102), 30 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:50,636 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 327 transitions. [2021-11-21 00:27:50,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-21 00:27:50,637 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:27:50,637 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:27:50,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 00:27:50,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-21 00:27:50,850 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:27:50,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:27:50,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1463732113, now seen corresponding path program 5 times [2021-11-21 00:27:50,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:27:50,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648862494] [2021-11-21 00:27:50,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:27:50,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:27:50,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:51,000 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:27:51,000 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:27:51,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648862494] [2021-11-21 00:27:51,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1648862494] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:27:51,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760661019] [2021-11-21 00:27:51,001 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:27:51,001 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:27:51,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:27:51,006 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:27:51,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 00:27:51,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:27:51,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:27:51,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-21 00:27:51,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:27:51,116 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:27:51,116 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:27:51,119 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 15 treesize of output 13 [2021-11-21 00:27:51,458 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:27:51,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:27:51,871 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 9 proven. 30 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:27:51,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760661019] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:27:51,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [104001208] [2021-11-21 00:27:51,873 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:27:51,873 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:27:51,873 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:27:51,873 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:27:51,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:27:51,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:27:51,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:27:52,093 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 20 treesize of output 16 [2021-11-21 00:27:52,267 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:27:52,267 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 194 treesize of output 193 [2021-11-21 00:27:52,822 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 23 treesize of output 19 [2021-11-21 00:27:52,985 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 23 treesize of output 19 [2021-11-21 00:27:53,793 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:27:53,793 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 120 treesize of output 124 [2021-11-21 00:27:54,135 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 23 treesize of output 19 [2021-11-21 00:27:54,286 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 23 treesize of output 19 [2021-11-21 00:27:54,403 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 14 treesize of output 10 [2021-11-21 00:27:54,581 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:27:54,581 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 25 treesize of output 24 [2021-11-21 00:28:05,433 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:28:07,784 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:28:07,784 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:28:07,784 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 29 [2021-11-21 00:28:07,784 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516938087] [2021-11-21 00:28:07,784 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:28:07,785 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 00:28:07,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:28:07,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 00:28:07,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1961, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 00:28:07,786 INFO L87 Difference]: Start difference. First operand 278 states and 327 transitions. Second operand has 31 states, 30 states have (on average 4.1) internal successors, (123), 30 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:08,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:28:08,450 INFO L93 Difference]: Finished difference Result 465 states and 544 transitions. [2021-11-21 00:28:08,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 00:28:08,450 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 4.1) internal successors, (123), 30 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-21 00:28:08,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:28:08,452 INFO L225 Difference]: With dead ends: 465 [2021-11-21 00:28:08,452 INFO L226 Difference]: Without dead ends: 465 [2021-11-21 00:28:08,453 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 793 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=472, Invalid=3068, Unknown=0, NotChecked=0, Total=3540 [2021-11-21 00:28:08,453 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 633 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 633 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:28:08,453 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [633 Valid, 104 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:28:08,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2021-11-21 00:28:08,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 346. [2021-11-21 00:28:08,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 346 states, 343 states have (on average 1.1982507288629738) internal successors, (411), 345 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:08,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 411 transitions. [2021-11-21 00:28:08,463 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 411 transitions. Word has length 41 [2021-11-21 00:28:08,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:28:08,463 INFO L470 AbstractCegarLoop]: Abstraction has 346 states and 411 transitions. [2021-11-21 00:28:08,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 4.1) internal successors, (123), 30 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:08,464 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 411 transitions. [2021-11-21 00:28:08,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 00:28:08,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:28:08,465 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:28:08,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-11-21 00:28:08,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-21 00:28:08,678 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:28:08,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:28:08,678 INFO L85 PathProgramCache]: Analyzing trace with hash 525396335, now seen corresponding path program 3 times [2021-11-21 00:28:08,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:28:08,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784398196] [2021-11-21 00:28:08,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:28:08,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:28:08,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:28:08,824 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 1 proven. 37 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:28:08,824 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:28:08,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784398196] [2021-11-21 00:28:08,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784398196] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:28:08,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26887025] [2021-11-21 00:28:08,825 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:28:08,825 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:08,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:28:08,830 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:28:08,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 00:28:08,920 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:28:08,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:28:08,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-21 00:28:08,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:28:09,191 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 4 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:28:09,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:28:09,413 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 5 treesize of output 3 [2021-11-21 00:28:09,450 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 4 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:28:09,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26887025] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:28:09,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1954129809] [2021-11-21 00:28:09,452 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:28:09,452 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:28:09,452 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:28:09,452 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:28:09,452 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:28:09,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:28:09,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:28:09,660 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 20 treesize of output 16 [2021-11-21 00:28:09,879 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:28:09,879 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 194 treesize of output 193 [2021-11-21 00:28:10,412 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 23 treesize of output 19 [2021-11-21 00:28:10,609 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 23 treesize of output 19 [2021-11-21 00:28:11,340 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:28:11,341 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 117 treesize of output 121 [2021-11-21 00:28:11,732 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 23 treesize of output 19 [2021-11-21 00:28:11,910 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 23 treesize of output 19 [2021-11-21 00:28:12,081 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 14 treesize of output 10 [2021-11-21 00:28:12,246 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:28:12,246 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 25 treesize of output 24 [2021-11-21 00:28:39,302 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:28:41,473 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:28:41,473 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:28:41,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 24 [2021-11-21 00:28:41,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786663855] [2021-11-21 00:28:41,473 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:28:41,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 00:28:41,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:28:41,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 00:28:41,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1552, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 00:28:41,476 INFO L87 Difference]: Start difference. First operand 346 states and 411 transitions. Second operand has 26 states, 25 states have (on average 3.48) internal successors, (87), 25 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:42,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:28:42,281 INFO L93 Difference]: Finished difference Result 417 states and 484 transitions. [2021-11-21 00:28:42,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 00:28:42,281 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 3.48) internal successors, (87), 25 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-21 00:28:42,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:28:42,283 INFO L225 Difference]: With dead ends: 417 [2021-11-21 00:28:42,283 INFO L226 Difference]: Without dead ends: 417 [2021-11-21 00:28:42,283 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 841 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=528, Invalid=3012, Unknown=0, NotChecked=0, Total=3540 [2021-11-21 00:28:42,283 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 364 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 615 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:28:42,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [364 Valid, 135 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 615 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:28:42,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2021-11-21 00:28:42,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 349. [2021-11-21 00:28:42,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 346 states have (on average 1.19364161849711) internal successors, (413), 348 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:42,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 413 transitions. [2021-11-21 00:28:42,293 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 413 transitions. Word has length 42 [2021-11-21 00:28:42,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:28:42,294 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 413 transitions. [2021-11-21 00:28:42,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 3.48) internal successors, (87), 25 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:42,294 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 413 transitions. [2021-11-21 00:28:42,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 00:28:42,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:28:42,295 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:28:42,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-21 00:28:42,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-21 00:28:42,510 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:28:42,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:28:42,510 INFO L85 PathProgramCache]: Analyzing trace with hash -1182475613, now seen corresponding path program 6 times [2021-11-21 00:28:42,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:28:42,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38480539] [2021-11-21 00:28:42,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:28:42,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:28:42,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:28:42,699 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 4 proven. 46 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:28:42,699 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:28:42,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38480539] [2021-11-21 00:28:42,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [38480539] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:28:42,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422459493] [2021-11-21 00:28:42,700 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:28:42,700 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:42,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:28:42,702 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:28:42,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 00:28:42,810 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:28:42,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:28:42,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-21 00:28:42,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:28:42,829 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:28:42,830 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 00:28:43,175 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 41 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:28:43,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:28:43,658 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 16 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:28:43,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422459493] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:28:43,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2082423772] [2021-11-21 00:28:43,659 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:28:43,659 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:28:43,660 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:28:43,660 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:28:43,660 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:28:43,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:28:43,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:28:43,905 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 23 treesize of output 19 [2021-11-21 00:28:44,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:28:44,062 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 200 treesize of output 192 [2021-11-21 00:28:44,514 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 23 treesize of output 19 [2021-11-21 00:28:44,751 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 23 treesize of output 19 [2021-11-21 00:28:45,362 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:28:45,363 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 117 treesize of output 121 [2021-11-21 00:28:45,762 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 23 treesize of output 19 [2021-11-21 00:28:45,941 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 23 treesize of output 19 [2021-11-21 00:28:46,159 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 14 treesize of output 10 [2021-11-21 00:28:46,418 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:28:46,418 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 25 treesize of output 24 [2021-11-21 00:28:53,152 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:28:55,155 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:28:55,155 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:28:55,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 37 [2021-11-21 00:28:55,156 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123472190] [2021-11-21 00:28:55,156 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:28:55,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-21 00:28:55,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:28:55,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-21 00:28:55,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=2482, Unknown=0, NotChecked=0, Total=2756 [2021-11-21 00:28:55,157 INFO L87 Difference]: Start difference. First operand 349 states and 413 transitions. Second operand has 39 states, 38 states have (on average 2.9210526315789473) internal successors, (111), 38 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:55,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:28:55,998 INFO L93 Difference]: Finished difference Result 594 states and 689 transitions. [2021-11-21 00:28:55,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 00:28:55,998 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.9210526315789473) internal successors, (111), 38 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-21 00:28:55,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:28:56,001 INFO L225 Difference]: With dead ends: 594 [2021-11-21 00:28:56,001 INFO L226 Difference]: Without dead ends: 594 [2021-11-21 00:28:56,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1285 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=608, Invalid=3682, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 00:28:56,002 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 393 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 985 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 393 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 1028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 985 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:28:56,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [393 Valid, 262 Invalid, 1028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 985 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:28:56,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2021-11-21 00:28:56,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 479. [2021-11-21 00:28:56,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 476 states have (on average 1.2121848739495797) internal successors, (577), 478 states have internal predecessors, (577), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:56,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 577 transitions. [2021-11-21 00:28:56,016 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 577 transitions. Word has length 42 [2021-11-21 00:28:56,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:28:56,016 INFO L470 AbstractCegarLoop]: Abstraction has 479 states and 577 transitions. [2021-11-21 00:28:56,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.9210526315789473) internal successors, (111), 38 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:56,016 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 577 transitions. [2021-11-21 00:28:56,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 00:28:56,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:28:56,017 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:28:56,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-21 00:28:56,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-21 00:28:56,234 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:28:56,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:28:56,234 INFO L85 PathProgramCache]: Analyzing trace with hash -1051265425, now seen corresponding path program 6 times [2021-11-21 00:28:56,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:28:56,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457366104] [2021-11-21 00:28:56,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:28:56,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:28:56,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:28:56,548 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 17 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:56,548 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:28:56,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457366104] [2021-11-21 00:28:56,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457366104] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:28:56,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976202612] [2021-11-21 00:28:56,548 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:28:56,549 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:56,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:28:56,550 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:28:56,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 00:28:56,631 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:28:56,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:28:56,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-21 00:28:56,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:28:56,643 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 10 treesize of output 8 [2021-11-21 00:28:56,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:28:56,867 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-11-21 00:28:56,867 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 47 treesize of output 46 [2021-11-21 00:28:57,183 INFO L354 Elim1Store]: treesize reduction 29, result has 9.4 percent of original size [2021-11-21 00:28:57,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 28 treesize of output 17 [2021-11-21 00:28:57,213 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 17 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:28:57,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:00,180 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 56 treesize of output 50 [2021-11-21 00:29:00,309 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 17 proven. 17 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:29:00,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976202612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:00,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [680981621] [2021-11-21 00:29:00,310 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:29:00,310 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:00,311 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:00,311 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:00,311 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:00,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:29:00,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:29:00,520 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 23 treesize of output 19 [2021-11-21 00:29:00,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:29:00,724 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 200 treesize of output 192 [2021-11-21 00:29:01,205 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 23 treesize of output 19 [2021-11-21 00:29:01,337 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 23 treesize of output 19 [2021-11-21 00:29:02,032 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:29:02,032 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 117 treesize of output 121 [2021-11-21 00:29:02,429 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 23 treesize of output 19 [2021-11-21 00:29:02,628 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 23 treesize of output 19 [2021-11-21 00:29:02,838 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 14 treesize of output 10 [2021-11-21 00:29:02,923 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:29:02,923 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 25 treesize of output 24 [2021-11-21 00:29:13,885 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:29:16,274 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:29:16,275 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:29:16,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 11] total 26 [2021-11-21 00:29:16,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876938154] [2021-11-21 00:29:16,275 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:29:16,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 00:29:16,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:16,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 00:29:16,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1652, Unknown=1, NotChecked=0, Total=1806 [2021-11-21 00:29:16,276 INFO L87 Difference]: Start difference. First operand 479 states and 577 transitions. Second operand has 27 states, 27 states have (on average 3.2962962962962963) internal successors, (89), 26 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:16,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:16,643 INFO L93 Difference]: Finished difference Result 488 states and 584 transitions. [2021-11-21 00:29:16,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 00:29:16,644 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.2962962962962963) internal successors, (89), 26 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-21 00:29:16,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:16,646 INFO L225 Difference]: With dead ends: 488 [2021-11-21 00:29:16,646 INFO L226 Difference]: Without dead ends: 405 [2021-11-21 00:29:16,647 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 95 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 525 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=216, Invalid=2233, Unknown=1, NotChecked=0, Total=2450 [2021-11-21 00:29:16,647 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:16,648 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 226 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 264 Invalid, 0 Unknown, 64 Unchecked, 0.1s Time] [2021-11-21 00:29:16,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2021-11-21 00:29:16,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 404. [2021-11-21 00:29:16,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 401 states have (on average 1.229426433915212) internal successors, (493), 403 states have internal predecessors, (493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:16,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 493 transitions. [2021-11-21 00:29:16,657 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 493 transitions. Word has length 43 [2021-11-21 00:29:16,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:16,657 INFO L470 AbstractCegarLoop]: Abstraction has 404 states and 493 transitions. [2021-11-21 00:29:16,657 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.2962962962962963) internal successors, (89), 26 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:16,657 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 493 transitions. [2021-11-21 00:29:16,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 00:29:16,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:16,658 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:16,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:16,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:16,874 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:29:16,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:16,874 INFO L85 PathProgramCache]: Analyzing trace with hash -487556779, now seen corresponding path program 4 times [2021-11-21 00:29:16,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:16,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897871387] [2021-11-21 00:29:16,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:16,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:16,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:17,015 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 43 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:29:17,016 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:17,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897871387] [2021-11-21 00:29:17,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897871387] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:17,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715991090] [2021-11-21 00:29:17,016 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:29:17,016 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:17,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:17,017 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:17,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-21 00:29:17,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:17,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-21 00:29:17,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:17,122 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:29:17,122 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:29:17,126 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 15 treesize of output 13 [2021-11-21 00:29:17,472 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:29:17,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:17,859 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:29:17,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715991090] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:17,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [837383648] [2021-11-21 00:29:17,860 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:29:17,860 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:17,860 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:17,860 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:17,860 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:17,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:29:17,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:29:18,038 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 20 treesize of output 16 [2021-11-21 00:29:18,252 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:29:18,252 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 194 treesize of output 193 [2021-11-21 00:29:18,837 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 23 treesize of output 19 [2021-11-21 00:29:18,982 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 23 treesize of output 19 [2021-11-21 00:29:19,598 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:29:19,599 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 117 treesize of output 121 [2021-11-21 00:29:20,138 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 23 treesize of output 19 [2021-11-21 00:29:20,330 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 23 treesize of output 19 [2021-11-21 00:29:20,458 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 14 treesize of output 10 [2021-11-21 00:29:20,593 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:29:20,593 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 25 treesize of output 24 [2021-11-21 00:29:47,669 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:29:50,010 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:29:50,010 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:29:50,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 29 [2021-11-21 00:29:50,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866548699] [2021-11-21 00:29:50,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:29:50,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 00:29:50,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:50,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 00:29:50,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1982, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 00:29:50,011 INFO L87 Difference]: Start difference. First operand 404 states and 493 transitions. Second operand has 31 states, 30 states have (on average 3.966666666666667) internal successors, (119), 30 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:50,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:50,942 INFO L93 Difference]: Finished difference Result 456 states and 535 transitions. [2021-11-21 00:29:50,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 00:29:50,942 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.966666666666667) internal successors, (119), 30 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-21 00:29:50,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:50,944 INFO L225 Difference]: With dead ends: 456 [2021-11-21 00:29:50,944 INFO L226 Difference]: Without dead ends: 456 [2021-11-21 00:29:50,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=552, Invalid=3608, Unknown=0, NotChecked=0, Total=4160 [2021-11-21 00:29:50,945 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 608 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 541 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 608 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 697 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:50,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [608 Valid, 85 Invalid, 697 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 541 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:29:50,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 456 states. [2021-11-21 00:29:50,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 456 to 404. [2021-11-21 00:29:50,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 401 states have (on average 1.2194513715710724) internal successors, (489), 403 states have internal predecessors, (489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:50,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 489 transitions. [2021-11-21 00:29:50,954 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 489 transitions. Word has length 44 [2021-11-21 00:29:50,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:50,955 INFO L470 AbstractCegarLoop]: Abstraction has 404 states and 489 transitions. [2021-11-21 00:29:50,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.966666666666667) internal successors, (119), 30 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:50,955 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 489 transitions. [2021-11-21 00:29:50,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-21 00:29:50,956 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:50,956 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:50,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:51,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:51,170 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:29:51,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:51,170 INFO L85 PathProgramCache]: Analyzing trace with hash 192165190, now seen corresponding path program 5 times [2021-11-21 00:29:51,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:51,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491124840] [2021-11-21 00:29:51,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:51,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:51,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:51,738 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 16 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:51,738 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:51,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491124840] [2021-11-21 00:29:51,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491124840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:51,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562988946] [2021-11-21 00:29:51,739 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:29:51,739 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:51,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:51,740 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:51,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-21 00:29:51,855 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 00:29:51,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:29:51,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-21 00:29:51,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:51,870 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 10 treesize of output 8 [2021-11-21 00:29:52,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 00:29:52,159 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-11-21 00:29:52,159 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 47 treesize of output 46 [2021-11-21 00:29:54,782 INFO L354 Elim1Store]: treesize reduction 20, result has 51.2 percent of original size [2021-11-21 00:29:54,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 58 treesize of output 48 [2021-11-21 00:29:54,794 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 16 proven. 54 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:29:54,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:55,574 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~length2~0#1| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0)) is different from false [2021-11-21 00:29:55,578 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 56 treesize of output 50 [2021-11-21 00:29:55,779 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 16 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:29:55,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562988946] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:55,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1199706973] [2021-11-21 00:29:55,781 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:29:55,781 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:55,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:55,781 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:55,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:55,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:29:55,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:29:55,997 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 23 treesize of output 19 [2021-11-21 00:29:56,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:29:56,170 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 200 treesize of output 192 [2021-11-21 00:29:56,741 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 23 treesize of output 19 [2021-11-21 00:29:56,913 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 23 treesize of output 19 [2021-11-21 00:29:57,581 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:29:57,581 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 117 treesize of output 121 [2021-11-21 00:29:57,971 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 23 treesize of output 19 [2021-11-21 00:29:58,161 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 23 treesize of output 19 [2021-11-21 00:29:58,285 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 14 treesize of output 10 [2021-11-21 00:29:58,408 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:29:58,409 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 25 treesize of output 24 [2021-11-21 00:30:05,462 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:30:07,721 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:30:07,721 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:30:07,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 17] total 39 [2021-11-21 00:30:07,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110180840] [2021-11-21 00:30:07,722 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:30:07,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-21 00:30:07,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:07,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-21 00:30:07,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2570, Unknown=1, NotChecked=102, Total=2862 [2021-11-21 00:30:07,723 INFO L87 Difference]: Start difference. First operand 404 states and 489 transitions. Second operand has 40 states, 40 states have (on average 2.3) internal successors, (92), 39 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:11,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:11,043 INFO L93 Difference]: Finished difference Result 492 states and 588 transitions. [2021-11-21 00:30:11,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-21 00:30:11,044 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.3) internal successors, (92), 39 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-21 00:30:11,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:11,046 INFO L225 Difference]: With dead ends: 492 [2021-11-21 00:30:11,046 INFO L226 Difference]: Without dead ends: 492 [2021-11-21 00:30:11,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 96 SyntacticMatches, 6 SemanticMatches, 67 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 993 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=351, Invalid=4208, Unknown=1, NotChecked=132, Total=4692 [2021-11-21 00:30:11,047 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 41 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 486 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 108 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:11,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 203 Invalid, 621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 486 Invalid, 0 Unknown, 108 Unchecked, 0.2s Time] [2021-11-21 00:30:11,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-11-21 00:30:11,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 439. [2021-11-21 00:30:11,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 439 states, 436 states have (on average 1.2201834862385321) internal successors, (532), 438 states have internal predecessors, (532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:11,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 439 states to 439 states and 532 transitions. [2021-11-21 00:30:11,056 INFO L78 Accepts]: Start accepts. Automaton has 439 states and 532 transitions. Word has length 45 [2021-11-21 00:30:11,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:11,057 INFO L470 AbstractCegarLoop]: Abstraction has 439 states and 532 transitions. [2021-11-21 00:30:11,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.3) internal successors, (92), 39 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:11,057 INFO L276 IsEmpty]: Start isEmpty. Operand 439 states and 532 transitions. [2021-11-21 00:30:11,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-21 00:30:11,058 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:11,058 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:30:11,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-21 00:30:11,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-21 00:30:11,286 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:30:11,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:11,286 INFO L85 PathProgramCache]: Analyzing trace with hash 91221696, now seen corresponding path program 2 times [2021-11-21 00:30:11,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:11,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978116960] [2021-11-21 00:30:11,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:11,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:11,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:11,630 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 17 proven. 46 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:30:11,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:11,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978116960] [2021-11-21 00:30:11,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978116960] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:30:11,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940130181] [2021-11-21 00:30:11,630 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:30:11,631 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:30:11,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:30:11,632 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:30:11,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-21 00:30:11,734 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:30:11,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:30:11,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-21 00:30:11,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:30:11,752 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:30:11,752 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 00:30:11,951 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 15 treesize of output 11 [2021-11-21 00:30:12,125 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 48 treesize of output 42 [2021-11-21 00:30:13,007 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 18 proven. 51 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:30:13,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:30:13,437 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 39 treesize of output 35 [2021-11-21 00:30:13,443 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:30:13,443 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 59 [2021-11-21 00:30:13,962 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:30:13,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940130181] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:30:13,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [871506559] [2021-11-21 00:30:13,963 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:30:13,963 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:30:13,964 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:30:13,964 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:30:13,964 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:30:13,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:30:13,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:30:14,216 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 23 treesize of output 19 [2021-11-21 00:30:14,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:30:14,384 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 200 treesize of output 192 [2021-11-21 00:30:14,872 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 23 treesize of output 19 [2021-11-21 00:30:15,019 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 23 treesize of output 19 [2021-11-21 00:30:15,681 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:30:15,682 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 117 treesize of output 121 [2021-11-21 00:30:16,029 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 23 treesize of output 19 [2021-11-21 00:30:16,163 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 23 treesize of output 19 [2021-11-21 00:30:16,436 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 14 treesize of output 10 [2021-11-21 00:30:16,621 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:30:16,621 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 25 treesize of output 24 [2021-11-21 00:30:43,685 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:30:46,281 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:30:46,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:30:46,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18, 17] total 45 [2021-11-21 00:30:46,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556475093] [2021-11-21 00:30:46,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:30:46,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-21 00:30:46,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:46,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-21 00:30:46,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=3501, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 00:30:46,282 INFO L87 Difference]: Start difference. First operand 439 states and 532 transitions. Second operand has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:48,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:48,033 INFO L93 Difference]: Finished difference Result 443 states and 520 transitions. [2021-11-21 00:30:48,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 00:30:48,033 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-21 00:30:48,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:48,036 INFO L225 Difference]: With dead ends: 443 [2021-11-21 00:30:48,036 INFO L226 Difference]: Without dead ends: 437 [2021-11-21 00:30:48,037 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 94 SyntacticMatches, 4 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2020 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=770, Invalid=6540, Unknown=0, NotChecked=0, Total=7310 [2021-11-21 00:30:48,037 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 400 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 723 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 400 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 1315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 723 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 553 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:48,037 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [400 Valid, 224 Invalid, 1315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 723 Invalid, 0 Unknown, 553 Unchecked, 0.4s Time] [2021-11-21 00:30:48,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2021-11-21 00:30:48,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 373. [2021-11-21 00:30:48,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 373 states, 370 states have (on average 1.2135135135135136) internal successors, (449), 372 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:48,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 449 transitions. [2021-11-21 00:30:48,045 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 449 transitions. Word has length 47 [2021-11-21 00:30:48,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:48,046 INFO L470 AbstractCegarLoop]: Abstraction has 373 states and 449 transitions. [2021-11-21 00:30:48,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:48,046 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 449 transitions. [2021-11-21 00:30:48,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-21 00:30:48,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:48,047 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:30:48,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-21 00:30:48,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-21 00:30:48,262 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:30:48,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:48,262 INFO L85 PathProgramCache]: Analyzing trace with hash -1915195704, now seen corresponding path program 5 times [2021-11-21 00:30:48,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:48,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988453426] [2021-11-21 00:30:48,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:48,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:48,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:48,562 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 41 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:30:48,562 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:48,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988453426] [2021-11-21 00:30:48,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988453426] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:30:48,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103487798] [2021-11-21 00:30:48,562 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:30:48,563 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:30:48,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:30:48,566 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:30:48,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-21 00:30:48,685 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:30:48,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:30:48,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 00:30:48,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:30:48,849 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 21 treesize of output 17 [2021-11-21 00:30:49,278 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-21 00:30:49,278 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 38 treesize of output 26 [2021-11-21 00:30:49,284 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 47 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:30:49,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:30:49,472 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 15 treesize of output 13 [2021-11-21 00:30:49,473 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 26 treesize of output 22 [2021-11-21 00:30:49,603 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 47 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:30:49,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103487798] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:30:49,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1886136046] [2021-11-21 00:30:49,605 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:30:49,605 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:30:49,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:30:49,605 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:30:49,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:30:49,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:30:49,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:30:49,836 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 20 treesize of output 16 [2021-11-21 00:30:50,043 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:30:50,043 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 194 treesize of output 193 [2021-11-21 00:30:50,721 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 23 treesize of output 19 [2021-11-21 00:30:50,875 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 23 treesize of output 19 [2021-11-21 00:30:51,630 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:30:51,630 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 117 treesize of output 121 [2021-11-21 00:30:52,094 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 23 treesize of output 19 [2021-11-21 00:30:52,223 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 23 treesize of output 19 [2021-11-21 00:30:52,378 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 14 treesize of output 10 [2021-11-21 00:30:52,545 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:30:52,545 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 25 treesize of output 24 [2021-11-21 00:31:19,977 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:31:22,531 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:31:22,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:31:22,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14, 14] total 36 [2021-11-21 00:31:22,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19333233] [2021-11-21 00:31:22,531 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:31:22,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-21 00:31:22,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:31:22,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-21 00:31:22,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=2488, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 00:31:22,533 INFO L87 Difference]: Start difference. First operand 373 states and 449 transitions. Second operand has 36 states, 36 states have (on average 3.138888888888889) internal successors, (113), 36 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:25,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:31:25,155 INFO L93 Difference]: Finished difference Result 649 states and 738 transitions. [2021-11-21 00:31:25,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-21 00:31:25,156 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.138888888888889) internal successors, (113), 36 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-21 00:31:25,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:31:25,158 INFO L225 Difference]: With dead ends: 649 [2021-11-21 00:31:25,158 INFO L226 Difference]: Without dead ends: 643 [2021-11-21 00:31:25,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 104 SyntacticMatches, 6 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 5 DeprecatedPredicates, 2893 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=614, Invalid=9892, Unknown=0, NotChecked=0, Total=10506 [2021-11-21 00:31:25,159 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 394 mSDsluCounter, 849 mSDsCounter, 0 mSdLazyCounter, 2320 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 394 SdHoareTripleChecker+Valid, 867 SdHoareTripleChecker+Invalid, 2656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 2320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 264 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:31:25,159 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [394 Valid, 867 Invalid, 2656 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 2320 Invalid, 0 Unknown, 264 Unchecked, 1.0s Time] [2021-11-21 00:31:25,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 643 states. [2021-11-21 00:31:25,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 643 to 452. [2021-11-21 00:31:25,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 449 states have (on average 1.2026726057906458) internal successors, (540), 451 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:25,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 540 transitions. [2021-11-21 00:31:25,170 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 540 transitions. Word has length 47 [2021-11-21 00:31:25,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:31:25,171 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 540 transitions. [2021-11-21 00:31:25,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.138888888888889) internal successors, (113), 36 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:25,171 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 540 transitions. [2021-11-21 00:31:25,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-21 00:31:25,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:31:25,172 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:31:25,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-21 00:31:25,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:25,398 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:31:25,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:31:25,398 INFO L85 PathProgramCache]: Analyzing trace with hash 1760874124, now seen corresponding path program 6 times [2021-11-21 00:31:25,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:31:25,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951552754] [2021-11-21 00:31:25,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:31:25,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:31:25,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:31:25,584 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 4 proven. 58 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:31:25,584 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:31:25,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951552754] [2021-11-21 00:31:25,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951552754] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:31:25,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470200125] [2021-11-21 00:31:25,585 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:31:25,585 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:25,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:31:25,586 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:31:25,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-21 00:31:25,683 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:31:25,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:31:25,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 00:31:25,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:31:25,702 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:31:25,703 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 00:31:25,992 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 23 treesize of output 19 [2021-11-21 00:31:26,442 INFO L354 Elim1Store]: treesize reduction 10, result has 23.1 percent of original size [2021-11-21 00:31:26,442 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 54 treesize of output 40 [2021-11-21 00:31:26,470 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 42 proven. 20 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:31:26,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:31:26,890 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 24 [2021-11-21 00:31:26,892 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 32 treesize of output 30 [2021-11-21 00:31:27,348 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 38 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:31:27,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470200125] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:31:27,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1618637056] [2021-11-21 00:31:27,349 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:31:27,349 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:31:27,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:31:27,349 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:31:27,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:31:27,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:31:27,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:31:27,523 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 20 treesize of output 16 [2021-11-21 00:31:27,775 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:31:27,776 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 194 treesize of output 193 [2021-11-21 00:31:28,437 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 23 treesize of output 19 [2021-11-21 00:31:28,594 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 23 treesize of output 19 [2021-11-21 00:31:29,203 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:31:29,204 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 120 treesize of output 124 [2021-11-21 00:31:29,608 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 23 treesize of output 19 [2021-11-21 00:31:29,811 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 23 treesize of output 19 [2021-11-21 00:31:30,006 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 14 treesize of output 10 [2021-11-21 00:31:30,299 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:31:30,299 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 25 treesize of output 24 [2021-11-21 00:31:37,208 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:31:39,370 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:31:39,371 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:31:39,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 15] total 40 [2021-11-21 00:31:39,371 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941654873] [2021-11-21 00:31:39,371 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:31:39,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 00:31:39,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:31:39,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 00:31:39,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=2739, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 00:31:39,372 INFO L87 Difference]: Start difference. First operand 452 states and 540 transitions. Second operand has 41 states, 41 states have (on average 2.926829268292683) internal successors, (120), 40 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:41,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:31:41,049 INFO L93 Difference]: Finished difference Result 573 states and 672 transitions. [2021-11-21 00:31:41,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-21 00:31:41,049 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.926829268292683) internal successors, (120), 40 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-21 00:31:41,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:31:41,052 INFO L225 Difference]: With dead ends: 573 [2021-11-21 00:31:41,052 INFO L226 Difference]: Without dead ends: 571 [2021-11-21 00:31:41,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2584 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1283, Invalid=8817, Unknown=0, NotChecked=0, Total=10100 [2021-11-21 00:31:41,054 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 101 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 177 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:31:41,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 423 Invalid, 651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 446 Invalid, 0 Unknown, 177 Unchecked, 0.2s Time] [2021-11-21 00:31:41,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-11-21 00:31:41,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 466. [2021-11-21 00:31:41,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 463 states have (on average 1.2008639308855291) internal successors, (556), 465 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:41,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 556 transitions. [2021-11-21 00:31:41,063 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 556 transitions. Word has length 47 [2021-11-21 00:31:41,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:31:41,063 INFO L470 AbstractCegarLoop]: Abstraction has 466 states and 556 transitions. [2021-11-21 00:31:41,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.926829268292683) internal successors, (120), 40 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:41,063 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 556 transitions. [2021-11-21 00:31:41,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 00:31:41,064 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:31:41,064 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:31:41,101 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-21 00:31:41,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:41,265 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:31:41,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:31:41,265 INFO L85 PathProgramCache]: Analyzing trace with hash 999448052, now seen corresponding path program 7 times [2021-11-21 00:31:41,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:31:41,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131129222] [2021-11-21 00:31:41,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:31:41,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:31:41,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:31:41,471 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 25 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:31:41,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:31:41,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131129222] [2021-11-21 00:31:41,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131129222] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:31:41,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282285278] [2021-11-21 00:31:41,471 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:31:41,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:41,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:31:41,481 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:31:41,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-21 00:31:41,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:31:41,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-21 00:31:41,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:31:41,562 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:31:41,562 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 00:31:41,908 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 42 treesize of output 38 [2021-11-21 00:31:41,914 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-21 00:31:41,914 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 36 [2021-11-21 00:31:41,987 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:31:41,987 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 38 treesize of output 37 [2021-11-21 00:31:43,111 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-21 00:31:43,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 41 treesize of output 26 [2021-11-21 00:31:43,167 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 25 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:43,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:31:44,089 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0)) is different from false [2021-11-21 00:31:44,095 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 56 treesize of output 50 [2021-11-21 00:31:44,468 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 25 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:44,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282285278] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:31:44,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1162048955] [2021-11-21 00:31:44,470 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:31:44,470 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:31:44,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:31:44,470 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:31:44,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:31:44,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:31:44,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:31:44,707 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 23 treesize of output 19 [2021-11-21 00:31:44,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:31:44,836 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 200 treesize of output 192 [2021-11-21 00:31:45,345 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 23 treesize of output 19 [2021-11-21 00:31:45,524 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 23 treesize of output 19 [2021-11-21 00:31:46,110 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:31:46,110 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 120 treesize of output 124 [2021-11-21 00:31:46,516 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 23 treesize of output 19 [2021-11-21 00:31:46,776 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 23 treesize of output 19 [2021-11-21 00:31:46,992 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 14 treesize of output 10 [2021-11-21 00:31:47,074 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:31:47,074 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 25 treesize of output 24 [2021-11-21 00:31:58,046 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:32:00,690 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:32:00,691 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:32:00,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15, 15] total 37 [2021-11-21 00:32:00,691 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124393876] [2021-11-21 00:32:00,691 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:32:00,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-21 00:32:00,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:00,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-21 00:32:00,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=2552, Unknown=1, NotChecked=102, Total=2862 [2021-11-21 00:32:00,692 INFO L87 Difference]: Start difference. First operand 466 states and 556 transitions. Second operand has 38 states, 38 states have (on average 3.0) internal successors, (114), 37 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:03,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:03,266 INFO L93 Difference]: Finished difference Result 742 states and 865 transitions. [2021-11-21 00:32:03,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-21 00:32:03,267 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.0) internal successors, (114), 37 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-21 00:32:03,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:03,269 INFO L225 Difference]: With dead ends: 742 [2021-11-21 00:32:03,269 INFO L226 Difference]: Without dead ends: 652 [2021-11-21 00:32:03,270 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 930 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=392, Invalid=4167, Unknown=1, NotChecked=132, Total=4692 [2021-11-21 00:32:03,270 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 66 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:03,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 335 Invalid, 460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 329 Invalid, 0 Unknown, 106 Unchecked, 0.2s Time] [2021-11-21 00:32:03,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-11-21 00:32:03,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 635. [2021-11-21 00:32:03,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 635 states, 632 states have (on average 1.1819620253164558) internal successors, (747), 634 states have internal predecessors, (747), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:03,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 635 states to 635 states and 747 transitions. [2021-11-21 00:32:03,283 INFO L78 Accepts]: Start accepts. Automaton has 635 states and 747 transitions. Word has length 50 [2021-11-21 00:32:03,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:03,283 INFO L470 AbstractCegarLoop]: Abstraction has 635 states and 747 transitions. [2021-11-21 00:32:03,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.0) internal successors, (114), 37 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:03,283 INFO L276 IsEmpty]: Start isEmpty. Operand 635 states and 747 transitions. [2021-11-21 00:32:03,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-21 00:32:03,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:03,285 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:03,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:03,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-21 00:32:03,506 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:32:03,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:03,506 INFO L85 PathProgramCache]: Analyzing trace with hash 49454004, now seen corresponding path program 6 times [2021-11-21 00:32:03,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:03,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154288575] [2021-11-21 00:32:03,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:03,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:03,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:03,797 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 16 proven. 47 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:32:03,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:03,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154288575] [2021-11-21 00:32:03,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154288575] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:03,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115247069] [2021-11-21 00:32:03,798 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:32:03,798 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:03,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:03,802 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:03,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-21 00:32:03,922 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:32:03,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:32:03,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-21 00:32:03,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:03,932 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 10 treesize of output 8 [2021-11-21 00:32:04,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:32:04,107 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:32:04,107 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 42 treesize of output 41 [2021-11-21 00:32:05,577 INFO L354 Elim1Store]: treesize reduction 36, result has 58.6 percent of original size [2021-11-21 00:32:05,577 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 77 treesize of output 93 [2021-11-21 00:32:05,735 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 4 proven. 59 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:32:05,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:32:06,762 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-21 00:32:06,762 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 427 treesize of output 383 [2021-11-21 00:32:06,768 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 370 treesize of output 366 [2021-11-21 00:32:06,984 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 4 proven. 59 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:32:06,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115247069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:32:06,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1572996018] [2021-11-21 00:32:06,985 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:32:06,985 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:32:06,985 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:32:06,985 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:32:06,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:32:07,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:32:07,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:32:07,163 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 20 treesize of output 16 [2021-11-21 00:32:07,413 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:32:07,414 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 194 treesize of output 193 [2021-11-21 00:32:08,002 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 23 treesize of output 19 [2021-11-21 00:32:08,146 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 23 treesize of output 19 [2021-11-21 00:32:08,777 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:32:08,778 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 120 treesize of output 124 [2021-11-21 00:32:09,245 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 23 treesize of output 19 [2021-11-21 00:32:09,461 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 23 treesize of output 19 [2021-11-21 00:32:09,623 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 14 treesize of output 10 [2021-11-21 00:32:09,791 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:32:09,791 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 25 treesize of output 24 [2021-11-21 00:32:36,893 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:32:39,798 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:32:39,799 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:32:39,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 49 [2021-11-21 00:32:39,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194388310] [2021-11-21 00:32:39,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:32:39,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-21 00:32:39,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:39,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-21 00:32:39,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=4011, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 00:32:39,801 INFO L87 Difference]: Start difference. First operand 635 states and 747 transitions. Second operand has 50 states, 50 states have (on average 2.82) internal successors, (141), 49 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:50,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:50,512 INFO L93 Difference]: Finished difference Result 777 states and 893 transitions. [2021-11-21 00:32:50,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-21 00:32:50,512 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.82) internal successors, (141), 49 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-21 00:32:50,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:50,515 INFO L225 Difference]: With dead ends: 777 [2021-11-21 00:32:50,515 INFO L226 Difference]: Without dead ends: 749 [2021-11-21 00:32:50,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1821 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=525, Invalid=7485, Unknown=0, NotChecked=0, Total=8010 [2021-11-21 00:32:50,516 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 76 mSDsluCounter, 392 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 1075 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 581 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:50,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 371 Invalid, 1075 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 479 Invalid, 0 Unknown, 581 Unchecked, 0.2s Time] [2021-11-21 00:32:50,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 749 states. [2021-11-21 00:32:50,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 749 to 644. [2021-11-21 00:32:50,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 644 states, 641 states have (on average 1.1794071762870515) internal successors, (756), 643 states have internal predecessors, (756), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:50,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 644 states to 644 states and 756 transitions. [2021-11-21 00:32:50,544 INFO L78 Accepts]: Start accepts. Automaton has 644 states and 756 transitions. Word has length 51 [2021-11-21 00:32:50,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:50,544 INFO L470 AbstractCegarLoop]: Abstraction has 644 states and 756 transitions. [2021-11-21 00:32:50,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.82) internal successors, (141), 49 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:50,545 INFO L276 IsEmpty]: Start isEmpty. Operand 644 states and 756 transitions. [2021-11-21 00:32:50,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-21 00:32:50,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:50,546 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:50,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:50,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-21 00:32:50,774 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:32:50,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:50,774 INFO L85 PathProgramCache]: Analyzing trace with hash 523030176, now seen corresponding path program 7 times [2021-11-21 00:32:50,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:50,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959328617] [2021-11-21 00:32:50,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:50,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:50,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:50,949 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 4 proven. 60 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:32:50,950 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:50,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959328617] [2021-11-21 00:32:50,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1959328617] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:50,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308891385] [2021-11-21 00:32:50,950 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:32:50,951 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:50,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:50,954 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:50,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-21 00:32:51,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:51,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-21 00:32:51,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:51,068 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:32:51,069 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 00:32:51,071 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 15 treesize of output 13 [2021-11-21 00:32:51,583 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:32:51,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:32:52,124 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 16 proven. 48 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:32:52,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308891385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:32:52,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [342875722] [2021-11-21 00:32:52,126 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:32:52,126 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:32:52,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:32:52,126 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:32:52,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:32:52,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:32:52,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:32:52,340 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 20 treesize of output 16 [2021-11-21 00:32:52,540 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:32:52,541 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 194 treesize of output 193 [2021-11-21 00:32:53,087 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 23 treesize of output 19 [2021-11-21 00:32:53,301 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 23 treesize of output 19 [2021-11-21 00:32:54,048 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:32:54,048 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 120 treesize of output 124 [2021-11-21 00:32:54,371 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 23 treesize of output 19 [2021-11-21 00:32:54,565 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 23 treesize of output 19 [2021-11-21 00:32:54,765 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 14 treesize of output 10 [2021-11-21 00:32:54,869 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:32:54,869 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 25 treesize of output 24 [2021-11-21 00:33:22,531 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:33:25,019 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:33:25,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:33:25,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 35 [2021-11-21 00:33:25,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967561476] [2021-11-21 00:33:25,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:33:25,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-21 00:33:25,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:33:25,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-21 00:33:25,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=2539, Unknown=0, NotChecked=0, Total=2756 [2021-11-21 00:33:25,021 INFO L87 Difference]: Start difference. First operand 644 states and 756 transitions. Second operand has 37 states, 36 states have (on average 3.5555555555555554) internal successors, (128), 36 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:26,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:33:26,308 INFO L93 Difference]: Finished difference Result 706 states and 812 transitions. [2021-11-21 00:33:26,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-21 00:33:26,308 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 3.5555555555555554) internal successors, (128), 36 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-21 00:33:26,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:33:26,311 INFO L225 Difference]: With dead ends: 706 [2021-11-21 00:33:26,311 INFO L226 Difference]: Without dead ends: 706 [2021-11-21 00:33:26,311 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1326 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=871, Invalid=5135, Unknown=0, NotChecked=0, Total=6006 [2021-11-21 00:33:26,312 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 414 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 983 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 414 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 1077 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 983 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:33:26,312 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [414 Valid, 200 Invalid, 1077 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 983 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:33:26,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 706 states. [2021-11-21 00:33:26,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 706 to 647. [2021-11-21 00:33:26,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 647 states, 644 states have (on average 1.1770186335403727) internal successors, (758), 646 states have internal predecessors, (758), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:26,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 647 states to 647 states and 758 transitions. [2021-11-21 00:33:26,323 INFO L78 Accepts]: Start accepts. Automaton has 647 states and 758 transitions. Word has length 51 [2021-11-21 00:33:26,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:33:26,324 INFO L470 AbstractCegarLoop]: Abstraction has 647 states and 758 transitions. [2021-11-21 00:33:26,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 3.5555555555555554) internal successors, (128), 36 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:26,324 INFO L276 IsEmpty]: Start isEmpty. Operand 647 states and 758 transitions. [2021-11-21 00:33:26,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-21 00:33:26,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:33:26,326 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:33:26,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-21 00:33:26,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-21 00:33:26,542 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:33:26,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:33:26,542 INFO L85 PathProgramCache]: Analyzing trace with hash -1869548976, now seen corresponding path program 7 times [2021-11-21 00:33:26,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:33:26,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805107277] [2021-11-21 00:33:26,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:33:26,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:33:26,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:33:26,790 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 9 proven. 71 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:33:26,790 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:33:26,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805107277] [2021-11-21 00:33:26,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805107277] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:33:26,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719175718] [2021-11-21 00:33:26,791 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:33:26,791 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:33:26,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:33:26,798 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:33:26,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-21 00:33:26,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:33:26,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-21 00:33:26,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:33:27,152 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 16 proven. 64 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:33:27,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:33:27,418 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 5 treesize of output 3 [2021-11-21 00:33:27,464 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 16 proven. 64 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:33:27,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719175718] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:33:27,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1163716815] [2021-11-21 00:33:27,465 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:33:27,466 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:33:27,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:33:27,466 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:33:27,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:33:27,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:27,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:33:27,651 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 23 treesize of output 19 [2021-11-21 00:33:27,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:27,855 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 200 treesize of output 192 [2021-11-21 00:33:28,298 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 23 treesize of output 19 [2021-11-21 00:33:28,450 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 23 treesize of output 19 [2021-11-21 00:33:29,255 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 00:33:29,255 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 120 treesize of output 124 [2021-11-21 00:33:29,556 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 23 treesize of output 19 [2021-11-21 00:33:29,763 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 23 treesize of output 19 [2021-11-21 00:33:29,848 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 14 treesize of output 10 [2021-11-21 00:33:30,051 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:33:30,052 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 25 treesize of output 24 [2021-11-21 00:33:37,173 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:33:39,122 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:33:39,122 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:33:39,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 32 [2021-11-21 00:33:39,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405358658] [2021-11-21 00:33:39,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:33:39,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-21 00:33:39,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:33:39,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-21 00:33:39,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1954, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 00:33:39,123 INFO L87 Difference]: Start difference. First operand 647 states and 758 transitions. Second operand has 33 states, 32 states have (on average 3.0625) internal successors, (98), 33 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:40,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:33:40,017 INFO L93 Difference]: Finished difference Result 1073 states and 1241 transitions. [2021-11-21 00:33:40,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 00:33:40,017 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.0625) internal successors, (98), 33 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-21 00:33:40,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:33:40,021 INFO L225 Difference]: With dead ends: 1073 [2021-11-21 00:33:40,021 INFO L226 Difference]: Without dead ends: 1073 [2021-11-21 00:33:40,021 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 999 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=484, Invalid=3056, Unknown=0, NotChecked=0, Total=3540 [2021-11-21 00:33:40,022 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 398 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 1371 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 398 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 1409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:33:40,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [398 Valid, 340 Invalid, 1409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1371 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:33:40,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1073 states. [2021-11-21 00:33:40,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1073 to 882. [2021-11-21 00:33:40,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 882 states, 879 states have (on average 1.1899886234357224) internal successors, (1046), 881 states have internal predecessors, (1046), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:40,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 882 states to 882 states and 1046 transitions. [2021-11-21 00:33:40,038 INFO L78 Accepts]: Start accepts. Automaton has 882 states and 1046 transitions. Word has length 51 [2021-11-21 00:33:40,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:33:40,038 INFO L470 AbstractCegarLoop]: Abstraction has 882 states and 1046 transitions. [2021-11-21 00:33:40,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.0625) internal successors, (98), 33 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:40,039 INFO L276 IsEmpty]: Start isEmpty. Operand 882 states and 1046 transitions. [2021-11-21 00:33:40,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 00:33:40,040 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:33:40,040 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:33:40,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-21 00:33:40,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-21 00:33:40,258 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-21 00:33:40,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:33:40,258 INFO L85 PathProgramCache]: Analyzing trace with hash 2024256823, now seen corresponding path program 8 times [2021-11-21 00:33:40,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:33:40,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359506930] [2021-11-21 00:33:40,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:33:40,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:33:40,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:33:40,535 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 20 proven. 56 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:33:40,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:33:40,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359506930] [2021-11-21 00:33:40,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359506930] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:33:40,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816454880] [2021-11-21 00:33:40,536 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:33:40,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:33:40,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:33:40,537 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:33:40,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_181404ab-1706-4599-ac2a-f92081dd23cb/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-21 00:33:40,644 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:33:40,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:33:40,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-21 00:33:40,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:33:40,657 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 10 treesize of output 8 [2021-11-21 00:33:40,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:33:40,990 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-11-21 00:33:40,991 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 33 treesize of output 32 [2021-11-21 00:33:41,948 INFO L354 Elim1Store]: treesize reduction 54, result has 21.7 percent of original size [2021-11-21 00:33:41,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 66 treesize of output 48 [2021-11-21 00:33:41,985 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 20 proven. 56 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:33:41,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:33:44,757 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_substring_~pt~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse1 (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)))) (let ((.cse0 (select (select .cse1 |ULTIMATE.start_substring_~pt~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 2)))) (or (= .cse0 0) (not (= (select (select .cse1 |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) .cse0)))))) is different from false [2021-11-21 00:33:44,766 INFO L354 Elim1Store]: treesize reduction 14, result has 6.7 percent of original size [2021-11-21 00:33:44,767 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 469 treesize of output 415 [2021-11-21 00:33:45,036 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 20 proven. 56 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:33:45,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816454880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:33:45,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1307807360] [2021-11-21 00:33:45,037 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 00:33:45,037 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:33:45,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:33:45,038 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:33:45,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:33:45,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:45,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 00:33:45,263 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 20 treesize of output 16 [2021-11-21 00:33:45,467 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:33:45,467 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 194 treesize of output 193 [2021-11-21 00:33:46,086 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 23 treesize of output 19 [2021-11-21 00:33:46,220 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 23 treesize of output 19 [2021-11-21 00:33:46,904 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 00:33:46,904 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 117 treesize of output 121 [2021-11-21 00:33:47,275 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 23 treesize of output 19 [2021-11-21 00:33:47,492 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 23 treesize of output 19 [2021-11-21 00:33:47,707 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 14 treesize of output 10 [2021-11-21 00:33:47,803 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 00:33:47,804 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 25 treesize of output 24